Code No: R21023
R10
SET - 1
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRICAL CIRCUIT ANALYSIS - I
(Electrical and Electronics Engineering)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~~
1 a) Explain different types of elements that constitute an electric circuit.
b) Explain the difference between linear and nonlinear resistance and explain different
properties of voltage and current sources.
2 a) Using nodal analysis find the power desipated in the 4 ohms resistor as shown in
Figure 2.
[7]
[8]
[10]
b) Obtain the relationship between star to delta and delta to star conversion.
[5]
3 a) Explain the significance of real and reactive power and also complex power
[7]
b) A voltage of 200 V is applied to a pure resistor (R), a pure capacitor, C and a lossy
inductor coil, all of them connected in parallel. The total current is 2.4 A, while the
component currents are 1.5, 2.0 and 1.2 A respectively. Find the total power factor
and also the power factor of the coil. Draw the phasor diagram.
[8]
4 a) Explain how the current locus can be obtained for the following circuit shown with
neat diagram.
[7]
b) Define Q factor and derive its value for (i) series resonance and (ii) parallel
resonance.
1 of 2
||''''|||''|'''||''|
[8]
Code No: R21023
R10
SET - 1
5 a) Explain the concept of self and mutual inductance.
b) Explain “dot convention” for a set of magnetically coupled coils.
6
Draw a suitable tree and dual network. Use general loop analysis to find i0 in the
circuit shown in below Figure.
7 a) State and explain Millman’s theorem for d.c excitations.
b) Find the Thevenin’s voltage and the Thevenin’s equivalent resistance across
terminals a-b in Fig.7. Assume V1=15V, R1=6 Ohms, R2= 2 Ohms, r= 1 Ohm, I=2A
and V=12V. Determine the power drawn from the 12V source when the load is
connected.
[7]
[8]
[15]
[7]
[8]
Fig. 7
8 a) Apply the superposition principle to find ‘v0’ in the circuit shown in below Figure.
b) Explain reciprocity theorem.
[7]
2 of 2
||''''|||''|'''||''|
[8]
Code No: R21023
R10
SET - 2
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRICAL CIRCUIT ANALYSIS - I
(Electrical and Electronics Engineering)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~~
1 a) Differentiate between independent and dependent sources. What is their circuit
representation.
b) Explain the difference between linear and nonlinear resistance and explain different
properties of voltage and current sources.
[8]
2 a) Derive relationship between star to delta and delta to star conversion.
[5]
b) Obtain a single equivalent Resistance between A and B terminals shown in bellow
figure by Y- ∆ transformation.
3 a) Find the form factor for the following ware form.
b) A series R C circuit is excited by sinusoidal voltage I = Im sin wt. Find the
expression for impedance using phasor diagram.
1 of 2
||''''|||''|'''||''|
[7]
[10]
[10]
[5]
Code No: R21023
R10
SET - 2
4 a) Define resonance frequency and half power frequency. Derive the expression for
series resonance frequency
b) Determine the resonance frequency for the circuit shown in below figure
5 a)
b)
6 a)
b)
7 a)
b)
8 a)
b)
[8]
[7]
Two similar coils are wound on the same core. The resistance of each coil is 10 ohm. [8]
When excited by a 100 V, 50 Hz source, the first coil takes 2A, and the induced emf
in the second coil is 50V. Determine the self and mutual inductances.
Define coefficient of magnetic coupling. Derive the expression for coefficient of
[7]
magnetic coupling for coupled coils.
Define the following terms with respect to network topology.
a) Graph
b) Tree
c) Cut set d)duality between networks
For the given network graph shown below, write down the basic Tieset matrix,
taking the tree consisting of edges 2,4 and 5.
[8]
State and explain Thevinin's and Norton's theorems with examples.
examples
[8]
A load of (20-jx2) is supplied from a source of 10V rms and internal impedance
(10+j20)Ω.. Find the value of x2 for maximum power transfer and also find the
maximum power
[7]
Explain Compensation theorem.
[7]
Find the current ix using superposition theorem for the following network shown
bellow.
[8]
2 of 2
||''''|||''|'''||''|
[7]
Code No: R21023
R10
SET - 3
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRICAL CIRCUIT ANALYSIS - I
(Electrical and Electronics Engineering)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~~
1 a) Explain the properties of different Voltage and current sources.
b) Simplify the network, shown in Fig.1, using source transformations:
2 a) Find the current I supplied by the battery of the Figure 2 through delta / star
transformation.
[5]
[10]
[8]
Figure 2
b) Explain about super node and super mesh for DC excitation.
[7]
3 a) Derive RMS value and Average value and also form factor and peak factor from
fundamentals of sin wave.
b) A current of RMS value 10A and 40Hz frequency is in series with an equal
magnitude current at 50Hz frequency. Write the expression for instantaneous
currents and find its value (i) 0.025 sec (ii) 0.05 sec (iii) 0.1 sec after the two
currents have passed through their positive maximum values simultaneously.
[8]
4 a) Define Q factor and derive its value for (i) series resonance and (ii) parallel
resonance.
b) Consider a series resonance circuit consisting of a 10 Ohms resistance, a 2mH
inductance and a 200nF capacitance. Determine the maximum energy stored, the
energy dissipated per cycle and the bandwidth of the circuit.
[8]
1 of 2
||''''|||''|'''||''|
[7]
[7]
Code No: R21023
R10
SET - 3
5 a) Explain the terms self induction, mutual induction and coefficient of coupling as
[8]
applied to a magnetic circuit. With usual notation, establish the relationship
between mutual inductance, self inductance and coefficient of coupling.
b) A cast steel electromagnetic has an air gap of length 2mm and an iron path of length [7]
30cms. Find the MMF needed to produce a flux density of 0.8T in the air gap. The
relative permeability of the steel core at this flux density is 1000. Neglect leakage
& fringing.
6 a) Define the following terms with respect to network topology.
a) Graph
b) Tree
c) Cut set d) Tie Set
b) What is duality. Explain the procedure for obtaining the dual of the given planar
network shown below figure.
[7]
7 a) Explain Maximum power transfer theorem with example.
[7]
b) Find the current IL of the shown in following figure. Use Millmans theorem.
8 a) State and explain the Tellegen’s theorem.
b) Calculate the current in the 2Ω resistor of figure bellow using superposition
theorem.
2 of 2
||''''|||''|'''||''|
[8]
[8]
[7]
[8]
Code No: R21023
R10
SET - 4
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRICAL CIRCUIT ANALYSIS - I
(Electrical and Electronics Engineering)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~~
1 a) Differentiate between independent and dependent sources. What is their circuit
representation.
b) Make use of Source Transformation and obtain single source equivalent between the
[7]
[8]
terminals A-B, shown in the figure bellow.
2 a) Perform both node and mesh analysis for the circuit shown in below Figure to
determine all the branch voltages and currents.
b) Describe the Kirchoff’s laws
[8]
[7]
3 a) Using fundamental concepts of sin wave derive the R.M.S Value and Average value
and also find form factor and peak factor.
b) A resistor (R) of 50 Ω in parallel with a capacitor (C) of 40 µF, is connected in series
with a pure inductor (L) of 30 mH to a 100 V, 50 Hz supply. Calculate the total
current and also the current in the capacitor. Draw the phasor diagram.
[8]
4 a) Obtain the expression for the frequency at which maximum voltage occurs across the
capacitance in a series resonance circuit in terms of the Q-factor and resonance
frequency.
b) In a series RLC circuit if the applied voltage is 10V, and resonance frequency is
1KHz, and Q factor is 10, what is the maximum voltage across the inductance.
[8]
5 a) Describe the composite magnetic circuits.
[8]
b) Two coils having 800 and 1000 turns are wound on a common non-magnetic core.
The leakage flux and mutual flux due to a current of 5A in coil is 0.3 mwb and 0.6
mwb respectively. Find i) Self and mutual inductance ii) coefficient of coupling
1 of 2
||''''|||''|'''||''|
[7]
[7]
[7]
Code No: R21023
R10
SET - 4
6 a) For the topological graph shown in the figure, obtain the fundamental Tieset matrix
choosing the tree containing two elements 5 & 6.
[8]
b) Illustrate the procedure for obtaining the dual network of the given circuit shown in
below figure
[7]
7 a) State and explain Norton’s theorem.
[7]
b) Use the Thevenin equivalent of the network shown in Fig.7 to find the value of R
which will receive maximum power. Find also this power.
8 a) State and explain reciprocity theorems with sinusoidal excitations.
b) Determine the voltage across terminals AB using superposition theorem for the below
figure
2 of 2
||''''|||''|'''||''|
[8]
[7]
[8]
Code No: R21026
R10
SET - 1
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRONIC DEVICES AND CIRCUITS
(Com. to EEE, ECE, EIE, ECC, CSE, IT, BME)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~
1.
a) Explain in detail about Magnetic Deflection in cathode ray tube.
b) The electron beam in a CRT is displaced vertically by a magnetic field of flux density
2 x 10-4 Wb/m2 .The length of the magnetic field along the tube axis is the same as that
of electrostatic deflection plates. The final anode voltage is 800v.Calcualte the voltage
whichshould be applied to the Y- deflection plates 1cm apart , to return the spot back to
centre of screen.
(7M+8M)
2.
a) Prove that the conductivity of a semiconductor is given by σ= q( p µp + n µp)
b) Define the terms conductivity and mobility in a semiconductor.
(7M+8M)
a) Draw the V-I Characteristic of Zener diode and explain its operation.
b) Explain Avalanche breakdown and Zener break down .
(7M+8M)
a) Obtain the ripple factor of a Full wave rectifier with shunt capacitor filter.
b) Compare the performance of inductive L-section and π-section filters.
(7M+8M)
a) Define α, β and γ of a transistor show how are they related to each other?
b) Explain how a transistor is used an amplifier.
(7M+8M)
3.
4.
5.
6.
a) Explain the characteristic parameters of the JFET
b) A JFET has a driven current of 4mA.If Dss = 8mA and Vgs(off)= - 6V. find the values of
Vgs and Vp.
(10M+5M)
7.
a) Explain in detail about Bias compensation method
b) Explain in detail about collector to base bias.
(7M+8M)
a) Derive the network parameters for Two port devices.
b) What are salient features of Hybrid Parameters?
(7M+8M)
8.
1 of 1
||''''|||''|'''||''|
Code No: R21026
R10
SET - 2
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRONIC DEVICES AND CIRCUITS
(Com. to EEE, ECE, EIE, ECC, CSE, IT, BME)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~
1.
a) Explain in detail about electrostatic deflection in cathode ray tube.
b) An electrostatic CRT has a final anode voltage of 600V. The deflection plates are 3.5cm
long and 0.8 cm apart. The screen is at a distance of 20cm from the center of plates. A
voltage of 20V is applied to the defection plates.
Calculate i) Velocity of electron on reaching the field.
ii) Acceleration due to deflection field.
iii) Deflection produced on the screen in cm.
iv) Deflection sensitivity in cm/v.
(5M+10M)
2.
a) Explain the difference between intrinsic and extrinsic semiconductor
b) What is meant by p-type impurity in a semiconductor?
(8M+7M)
a) Draw the V-I Characteristic of PN junction diode and explain its operation.
b) Show that the Zener diode can be used as a voltage regulator.
(8M+7M)
3.
4.
A Half wave rectifier has a load of 3.5kΩ , If the diode resistance and secondary coil resistance
together have a resistance of 800Ω and input voltage has a signal voltage of peak value 240V
calculate i) Peak , average and rms valve of current flowing ii) dc power output
iii) ac power input iv) efficiency of the rectifier.
(15M)
5.
a) Explain the input and output Characteristic of a transistor in Common Emitter Configuration
b) Explain about punch through.
(10M+5M)
6.
a) With the help of suitable diagrams explain the working of different types of MOSFET.
b) Compare the MOSFET with JFET.
(10M+5M)
7.
a) Explain in detail about operating point and Basic stability
b) Explain in detail about compensation against variation in VBE , ICO.
8.
(8M+7M)
a) Why Hybrid parameters are called so? Define them.
b) A CE amplifier has the h-parameters given by hie = 1000Ω,hre = 2 x 10-4 , hfe =50
and hoe =25µ mho. If both the load and source resistance are 1k Ω, Determine the
i) Current gain ii) Voltage gain
(7M+8M)
1 of 1
||''''|||''|'''||''|
Code No: R21026
R10
SET - 3
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRONIC DEVICES AND CIRCUITS
(Com. to EEE, ECE, EIE, ECC, CSE, IT, BME)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~
1.
a) Explain about in magnetic field.
b) A charged particle having charge thrice that of an electron and mass twice that of an electron
is accelerated through a potential difference of 50V before it enters a uniform magnetic
field flux density of 0.02 Wb/m2 at an angle of 25o with field.
Calculate i).The velocity of the charged particle before entering the field.
ii). Radius of the helical path
iii) Time of revolution.
(5M+10M)
2.
a) Explain about Fermi Level in between intrinsic and extrinsic semiconductor.
b) define Drift and diffusion currents in semiconductor.
(8M+7M)
3.
a) Explain the principle behind the Varactor diode and list out its applications.
b) Explain the Construction of a PIN diode and give the applications of PIN diode. (7M+8M)
4.
a) Explain about series and shunt voltage regulators.
b) Derive an expression for the ripple factor in a full wave rectifier using inductor filter.
(7M+8M)
a) A transistor has IB = 100µA and IC = 2µA Find
i) β of the transistor ii) α of the transistor iii) Emitter current IE
iv) if IB changes by +25µA and IC changes by +0.6mA. Find the new valve of β?
b) Explain about Photo Transistor.
(5M+10M)
5.
6.
7.
8.
a) Describe the working principle of an SCR with V-I Characteristics.
b) Briefly describe some applications of JFET.
a) Explain in detail about Stabilization factors.
b) Explain about Thermistor and Sensistor compensation.
(10M+5M)
(7M+8M)
a) Explain about Conversion formulas for the parameters of three transistor configuration
b) Explain in detail about Measurement of h-parameters
(7M+8M)
1 of 1
||''''|||''|'''||''|
Code No: R21026
R10
SET - 4
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRONIC DEVICES AND CIRCUITS
(Com. to EEE, ECE, EIE, ECC, CSE, IT, BME)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~
1.
2.
a) Explain about Two – Dimensional motion of electron.
b) Explain in detail about Magnetic Focusing.
(7M+8M)
a) Discuss the following with respect to semiconductor
i) doping
ii) Dopant
iii) donor
iv) acceptor.
b) Explain “Majority and minority carriers” in semiconductors.
(8M+7M)
3.
a) What is tunneling? Form the energy band diagram explain the V-I characteristic of a
tunnel diode.
b) List out the applications of tunnel diode and mention its advantages and disadvantages.
(10M+5M)
4.
a) Draw the circuit diagram of an Half wave rectifier and explain its operation
b) Show that a Full wave rectifier is twice as efficiency as a Half wave rectifier.
(8M+7M)
5.
a) Explain the input and output Characteristic of a transistor in Common Base Configuration.
b) The Common Base d.c current gain of a transistor is 0.967 .If emitter current is 10mA,
What is the value of base current?
(10M+5M)
6.
a) Describe the working principle of an UJT with V-I Characteristics.
b) Explain why an SCR is operated only in the forward biased condition.
(8M+7M)
a) Explain about Self Bias Amplifiers.
b) Explain about Thermal runaway and Thermal stability.
(8M+7M)
7.
8.
a) Explain in detail about analysis of a transistor amplifier circuit biasing h - parameters.
b) Explain about Transistor Amplifier configurations.
(7M+8M)
1 of 1
||''''|||''|'''||''|
Code No: R21025
R10
SET - 1
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRICAL MACHINES - I
(Electrical and Electronics Engineering)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~
1 a) Draw and explain fully the general block –diagram representation of an
electromechanical energy conversion device
b) The λ − i characteristics of single excited electromagnet is given by
i = 121λ2 x 2 ,for 0<i<4A and 0<x<10cm. if the air gap is 5cm and a current of 3A is
following on the coil, calculate,
i) field energy, ii) co-energy and iii) mechanical force on the moving part
[7]
2 a) Obtain the condition for maximum efficiency of the DC generator
[6]
[8]
b) A 440V DC shunt generator has a full load current of 220A. The resistance of the
armature and field windings are 0.04Ω and 120Ω respectively. The stray losses are
2100W. Find the output of prime mover when it is delivering full load and find the
load for which the efficiency of the generator is maximum
[9]
3 a) A 4-pole generator supplies a current of 143A. It has 492 armature conductors i)
wave wound and ii) lap wound. When delivering full load, the brushes are given an
actual lead of 100. Calculate the demagnetizing amp-turns per pole. This field
winding is shunt connected and takes 10A. Find the number of extra shunt field
turns to neutralize the demagnetization.
b) Explain the importance of compensating windings in DC machines
[8]
[7]
4 a) Draw and explain the external characteristics of shunt, series and compound
generators
b) Explain the process of voltage build up in a DC shunt generator. What is the field
circuit critical resistance?
[8]
5 a) Two DC shunt generators are connected in parallel to supply a load of 5000A.
Each machine has an armature resistance of 0.03Ω and field resistance of 60Ω but
emf of one machine is 600V and that of the other machine is 640V. What power
does each machines supply the statement
b) Two shunt generators having drooping characteristics are best suited for parallel
operation. Explain?
[9]
1 of 2
||''''|||''|'''||''|
[7]
[6]
Code No: R21025
R10
SET - 1
6 a) What are the various losses occurring in rotating machines. Mention the methods to
reduce them.
[7]
b) A 120V DC shunt motor has an armature resistance of 0.2Ω and a field resistance of [8]
60Ω. The full load line current and full load speed are 60A and 1800 rpm. If the
brush contact drop is 3V. Find the speed of the motor at half load.
7 a) Write short notes on ward-Leonard method of speed control.
[6]
b) A 250V DC shunt motor with an armature resistance of 0.5Ω runs at 600 rpm on
full load and takes an armature current of 20A. If resistance of 1Ω is placed in the
armature circuit, find the speed at i) Full load torque ii) half-full load torque.
[9]
8 a) Explain the Swinburne’s test to determine no-load losses of DC machine. What is
the limitation of this test?
b) A 220V Dc shunt motor at no load takes a current of 2.5 A. The resistances of the
armature and shunt field are 0.8Ω and 200Ω respectively. Estimate the efficiency of
motor when the input current is 20A. State precisely the assumptions made.
[6]
2 of 2
||''''|||''|'''||''|
[9]
Code No: R21025
R10
SET - 2
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRICAL MACHINES - I
(Electrical and Electronics Engineering)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~
1 a) With one example derive the co-energy of a multi excited magnetic field system
b) A soft iron ring of 18cm mean diameter and circular cross-section of 3.5cm
diameter is wound with a magnetizing coil. A current of 5A flowing in the coil
produces flux of 2.5 mwb in the air gap which is 2.2mm wide. Taking relative
permeability to be 1000 at this flux densities and allowing for a leakage coefficient of 1.2, find the number of the turns on the coil.
2 a) Derive an expression for the emf of a DC generator
b) Calculate the voltage induced in the armature winding of a 4-pole, lap wound DC
machine having 728 active conductors and running at 1800 rpm. The flux per pole
is 30 mwb
3 a) Explain the armature reaction and commutation process in detail
b) A 250V, 14.9kW, 8-pole, DC motor has single turn coils. The armature is wave
wound with 94 conductor segments. If the brushes are shifted by 2 commutated
segments at full load, calculate i) total armature reaction ampere-turns ii)
demagnetizing ampere-turns iii) cross magnetizing ampere- turns. Assume motor
efficiency to be 80%
4 a) Draw the performance characteristics of different types of DC generators and
explain them.
b) A shunt generator gave the following results in the OCC test at a speed of 800rpm.
The field resistance is adjusted to 50Ω and the terminal voltage is 300V, armature
resistance is 0.1Ω and assuming that flux is reduced by 5% due to armature
reaction find the load supplied by the generator.
Field current(A) 1
2
3
4
6
8
10
EMF(V)
90 185 251 290 324 345 360
5 a) State four reasons for operating DC generators in parallel
[7]
[8]
[7]
[8]
[9]
[6]
[7]
[8]
[6]
b) The terminal voltage of a shunt generator G1 falls from 500V at no load to 470V
[9]
when delivering a current of 600A, for a second generator G2 the figures are 505V
at no load and 470V at 400A. When connected in parallel generators supply a total
load of 400KW. Assuming that the voltage, power characteristics are linear,
determine the common bus voltage and the current delivered by each machine.
1 of 2
||''''|||''|'''||''|
Code No: R21025
R10
SET - 2
6 a) What are the important characteristics of DC motor? Sketch all these
characteristics of DC series motors.
b) A 230 volts series motor is taking 50A. Resistance of armature and series field
winding is 0.2Ω and 0.1Ω respectively. Calculate i) Brush voltage, ii) Back EMF,
iii) Power wasted in armature and mechanical power developed.
7 a) Explain the working principle of a 3-point starter of a DC shunt motor.
b) A 240V series motor takes 40A when giving its rated output at 1500rpm. Its
resistance is 0.3Ω. Find what resistance must be added to obtain rated torque i) at
starting ii) at 1000rpm.
8 a) Determine a suitable method for determining the efficiency of series motor.
b) A 220V Dc shunt motor at no load takes a current of 2.5 A. The resistances of the
armature and shunt field are 0.8Ω and 200Ω respectively. Estimate the efficiency
of motor when the input current is 20A. State precisely the assumptions made.
2 of 2
||''''|||''|'''||''|
[9]
[6]
[8]
[7]
[6]
[9]
Code No: R21025
R10
SET - 3
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRICAL MACHINES - I
(Electrical and Electronics Engineering)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~
1 a) Draw and explain the general block diagram of an electromechanical energy
conversion device.
b) A coil is wound on an iron core to form a solenoid. A certain current is passing
through the coil which is producing a flux of 40 mwb. The length of magnetic
circuit is 75cm which its cross sectional area is 3cm2. Calculate the energy stored in
the circuit. Assuming relative permeability of iron as 1500.
[7]
[8]
2 a) With a help of sketch describe the main construction and working principle of DC
generators
b) A DC generator has an armature emf of 100V when the useful flux per pole is
20mwb, and the speed is 800rpm. calculate the generated emf i) with the same flux
and the speed of 1000rpm ii) with a flux per pole of 24mwb and a speed of 900rpm
[8]
3 a) Develop an expression for the demagnetizing and cross magnetizing ampere turns in
a DC generator
b) A 250KW, 400V, 6-pole, lap connected armature has 720 conductors. It is given a
brush lead of 2.50 mechanical from its GNA. Calculate the demagnetization and
cross magnetization AT/pole. Neglect shunt field current.
[7]
4 a) Draw the OCC characteristics and external characteristics of DC generator
[7]
b) A 500V, 250KW long shunt compound generator induces an emf of 480KW when
running at 1000rpm on no load. On full load the speed of the machine drops to
975rpm, the flux increases by 15% the terminal voltage to 500V. if the series and
shunt filed resistances are 0.02Ω and 100Ω respectively, calculate the armature
resistance. Assume a voltage drop of 1V per brush
[7]
[8]
[8]
5 a) Describe the advantages of using several small DC generators in parallel over the
[6]
uses of single large generators
b) Two DC shunt generators running in parallel to supply together 2500A. The machine [9]
has armature resistance of 0.04Ω and 0.025Ω, field resistances of 25Ω and 20Ω an
induced emf of 440V and 420V respectively. Find the bus bar voltage and output of
each machine.
6 a) Explain the principle of operation of DC motor. What is the back EMF of DC
motor? What is its effect?
b) A 250V DC shunt motor having an armature resistance of 0.25Ω carrying an
armature current of 50A and runs at 750 rpm. If the flux is reduced by 10% find the
speed. Assume that the torque remains same.
1 of 2
||''''|||''|'''||''|
[7]
[8]
Code No: R21025
R10
SET - 3
7 a) Why is starting current high in a DC motor? Explain the working of a four point
starter for a DC machine.
b) A DC series motor connected to a 440V supply runs at 600 rpm when taking a
current of 50 A. Calculate the values of resistance which when inserted in series
with motor will reduce the speed to 400 rpm, the gross torque being then half its
previous value. The resistance of motor in 0.2Ω Assume linear magnetism.
[6]
8 a) Explain advantages and disadvantages of Swinburn’s test.
[5]
b) The Hopkinson’s test on two similar shunt machines gave the following full load
data.
Line voltage: 110V, field and armature currents are 3A and 3.5A
Line current: 48A, armature resistance of each is 0.035Ω, motor armature current is
230A;
Calculate the efficiency of each machine assuming a brush contact drop of 1V per
brush.
2 of 2
||''''|||''|'''||''|
[9]
[10]
Code No: R21025
R10
SET - 4
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRICAL MACHINES - I
(Electrical and Electronics Engineering)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~
1 a) Explain in detail doubly excited systems
b) Two coupled coils have self and mutual inductances of L11 = 3 + 0.5 x ,
L22 = 2 + 0.5 x , L12 = L21 = 0.3x over a sustain range of linear displacement.
The first coil is excited by constant current of 15A and the second by a
constant current of 8A. Mechanical work done if x changes from 0.6 to 1m.
[7]
[8]
2 a) Explain with different methods of excitation and characteristics of DC
generators with suitable diagram
b) A 6-pole DC generator has 150 slots each slot has 8 conductors and each
conductor has resistance of 0.01Ω. The armature terminal current is 15A.
Calculate the current per conductor and the drop in the armature for lap and
wave winding connections
[7]
[8]
3 a) Explain the various methods of improving commutation in a dc machine
b) A 4-pole, 23.75KW, 250V lap wound DC generator has 8 slots with 8
conductor per slots and shunt field resistance of 50Ω. The brushes are given a
lead of 80 mechanical when the generator delivers full load current. Calculate
the number of turns on the compensating winding if the pole arc per pole shoe
pitch ration is 0.8
[7]
[8]
4 a) What could be the causes of failure of voltage build up of DC self excited
generator? How can the problem be remedied?
b) A 500V, 250KW long shunt compound generator induces an emf of 480KW
when running at 1000rpm on no load. On full load the speed of the machine
drops to 975rpm, the flux increases by 15% the terminal voltage to 500V. if
the series and shunt filed resistances are 0.02Ω and 100Ω respectively,
calculate the armature resistance. Assume a voltage drop of 1V per brush
[7]
[8]
5 a) Draw the connection diagram of two shunt generators connected in parallel and
discuss their load sharing
b) Two DC shunt generators are connected in parallel to supply a load of 5000A.
Each machine has an armature resistance of 0.03Ω and field resistance of 60Ω
but emf of one machine is 600V and that of the other machine is 640V. What
power does each machines supply?
[6]
[9]
1 of 2
||''''|||''|'''||''|
Code No: R21025
R10
6 a) Give the concept of counter EMF in a DC motor.
b) A 500V DC Shunt motor takes a current of 5A on no-load. The resistances of
the field and armature circuit are 250Ω and 0.22Ω respectively. Find i) The
efficiency when loaded and taking a current of 100A. ii) The percentage
change of speed. State precisely the assumptions made.
SET - 4
[6]
[9]
7 a) Make a list of different speed control methods for DC motor. Discuss merits
and demerits of each method.
b) A 220V DC shunt motor has an armature resistance of 0.5Ω. The armature
current at starting must not exceed 40 A. If the number of sections is 6,
calculate the values of resistor steps to be used in this starter.
[7]
[8]
8 a) Explain brake test for determining the efficiency of a DC machine.
[6]
b) A retardation test is made on a separately excited DC machine as a motor. The
induced voltage falls from 240V to 225V in 25 seconds on opening the
armature circuit and 6 seconds on suddenly changing the connection from
supply to a load resistance taking 10A (average). Find the efficiency of the
machine running as a motor and taking current of 25A on a supply of 250V.
The resistance of its armature is 0.4Ω and that of its field winding is 250Ω.
[9]
2 of 2
||''''|||''|'''||''|
Code No: R21029
R10
SET - 1
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRO MAGNETIC FIELDS
(Electrical and Electronics Engineering)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~~
1
a) Briefly explain about Coulomb’s Law.
b) Two point charges
C located at (1,2,4),
C located at
(1,2,-3) &
C located at (2,0,6) are placed in air. Find the vector
on charge .
2
a) Explain in detail about electric dipole and dipole moment.
b) Two equal charges Q are at the opposite corners of a square of side a, and an electric
dipole of moment m is at a third corner, pointing towards one of the charges. If
m=2 2 Qa, show that the field strength at the fourth corner of the square
17
Q
is
.
2 4πε 0 a 2
3
a) Explain in detail about Polarization and derive the relation between D, E & P.
b) Explain in detail about Equation of continuity.
4
a) Explain in detail about Magnetic Field Intensity due to a circular coil.
b) A solenoid of radius 20cm is 50 cm long, when a current 10 amps flows in a coil.
Find the MFI and flux density at a point on the axes distance 40 cm from one end.
5
a) Derive the Maxwell’s third equation, Curl (H)=Jc.
b) Develop the expression for MFI due to a square current loop.
6
a)
7
a)
8
a) State and explain in detail about Poynting Theorem.
b) Explain briefly about Maxwell’s equations for different cases.
Define magnetic pole strength and hence develop the expression for MFI in terms of
both scalar and vector magnetic potentials.
b) Explain in detail about Lorentz force equation.
Evaluate the inductance of a solenoid of 2800 turns wound uniformly over a length
0.6m on a cylindrical paper tube 4 cm in diameter and the medium is air.
b) Derive the mutual inductance between a straight long wire and a square loop wire in
the same plane.
1 of 1
||''''|||''|'''||''|
Code No: R21029
R10
SET - 2
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRO MAGNETIC FIELDS
(Electrical and Electronics Engineering)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~~
1 a) Derive the Maxwell’s equation
b) Calculate the force on a unit positive charge at P(x=2m, y=0) due to the charges Q1
at origin and Q2 at (x=1m, y=0) where Q1=1000 Pico coulombs Q2= -2000 Pico
coulombs.
2
a) Explain and derive Poisson’s & Laplace’s equation.
b) Derive torque equation on an electric dipole in an electric field.
3
a)
Show that
Tanθ 1 ε r1
when refraction of the electric field at a boundary free of
=
Tanθ 2 ε r 2
charge.
b) Derive the capacitance of a concentric cylindrical conductor.
4
a) Derive the Magnetic Field Intensity due to a square carrying wire.
b) A steady current of i amps flow in a conductor bend in a form of square loop of side
‘a’. Find the Magnetic Field Intensity at the centre of the loop.
5
a) State and Explain Ampere’s Law.
b) In the region 0<r<2 in cylindrical coordinate system. A current density is given by J
-r
= 6e az A/m2, find MFI.
6
a) Derive the force equation between two parallel conductors.
b) Derive torque equation when a current loop placed in magnetic field.
7
a)
A solenoid having a mean diameter of 20 cm & length of 50 cm having 1000 turns.
The coil is placed coaxially inside the other solenoid having a mean diameter of 60
cm and number of turns equal to 2000 and length of the outer solenoid is equal to
that of inner solenoid. Compute L1, L2 & M, neglect magnetic leakage medium and
medium is air.
b) Explain in detail about energy stored and energy density in a magnetic field.
8
a)
Show that the displacement current density will be equal to the rate of change of
electric flux density in time varying field.
b) Explain in detail about statically and dynamically induced EMFs.
1 of 1
||''''|||''|'''||''|
Code No: R21029
R10
SET - 3
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRO MAGNETIC FIELDS
(Electrical and Electronics Engineering)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~~
1
a) State and explain about Gauss’s law.
b) Calculate the Electric Field Intensity due to a straight conductor.
2
a) Briefly explain about Conductors and Insulators.
b) Find the potential V at the point p(2,3,4) for the field of two co-axial conducting
cylinders, given V=60v and ρ = 3m & V=10v at ρ = 5m .
3
a)
Derive the energy stored and energy density in a static electric field.
b) A parallel plate capacitor consists of two square metal plates with 500 mm side and
) 6mm thick is placed on the lower
separated by 10 mm. A slab of sulpher (
plate and air gap of 4 mm. Find the capacitance of the capacitor.
4
a)
Derive the Maxwell’s second Equation, Div(B)=0.
b) Find the magnetic field due to a current I in a coaxial cable whose inner conductor
has radius a and the outer conductor has the radii b, c (b < c).
5
a)
Develop the expression for MFI of an infinite sheet of current using the concept of
magnetic vector potential.
b) Explain in detail about Point form of Ampere’s circuital law.
6
a)
7
a)
A solenoid with 300 turns, 300mm long & 30 mm diameter, if the current is 500 mA
and assume µ r = 1 . Find (1) Inductance (2) Energy stored in solenoid.
b) Explain and Derive self inductance of a toroid.
8
a)
Derive the force on a straight and a long current carrying conductor in a magnetic
field.
b) A single phase circuit comprises two parallel conductors A & B, each 1cm diameter
and spaced 1m apart. The conductors carrying current of +100 & -100 Amps
respectively. Determine the field intensity at the surface of each conductor and also
in space exactly mid way between A & B.
Show that the curl of the magnetic and electric field intensities enclosed by a closed
surface will lead to the power transferred through the surface.
b) Explain about vector form of Faraday’s law.
1 of 1
||''''|||''|'''||''|
Code No: R21029
R10
SET - 4
II B. Tech I Semester Supplementary Examinations, June - 2015
ELECTRO MAGNETIC FIELDS
(Electrical and Electronics Engineering)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~~
1 a) Explain in detail about potential gradient.
b) Two point charges Q1 = 2nC, Q2 = 4 nC are located at points (1,1,1) and (1,0,0)
respectively. Determine the potential at point (1,1,0).
2
a) Write the procedure to solve Laplace equation by using direct method.
b) Explain in detail about behaviour of conductors in an electric dipole.
3
a)
Derive the equations for Conduction and Convection current densities.
b) Explain in detail about Ohm’s law in point form
4
a)
Develop the expression for Magnetic Field Induction of a straight sheet of current
using the concept of magnetic vector potential.
b) Explain in detail about Biot-Savart’s law.
5
a) Find the Magnetic Field Induction due to a rectangular loop using Ampere’s law.
b) Find the magnetic field of current in a straight circular cylindrical conductor of
radius a.
6
a)
Tanθ1 µ r1
=
at the magnetic interface.
Tanθ 2 µ r 2
b) Derive force on a differential current element in a magnetic field.
7
a) Write the characteristics of scalar magnetic potential and also write its limitations.
b) Explain and derive self inductance of a long solenoid.
8
a) Derive Maxwell’s fourth equation, Curl (E)= -∂B/∂t.
b) Show that the curl of the magnetic and electric field intensities enclosed by a closed
surface will lead to the power transferred through the surface.
Show that
1 of 1
||''''|||''|'''||''|
Code No: R21021
R10
SET - 1
II B. Tech I Semester Supplementary Examinations, June - 2015
FLUID MECHANICS AND HYDRALICS MACHINES
(Com. to EEE, ME, MM)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~
1
a)
b)
2
a)
b)
3
a)
b)
4
5
a)
b)
6
What is viscosity? Why it is important in fluid mechanics? Define Kinematic and
dynamic viscosity.
A plate (2m x 2m ), 0.25 mm distant apart from a fixed plate, moves at 40 cm/s
and requires a force of 1 N. Determine the dynamic viscosity of the fluid in
between the plates.
[8]
Distinguish between (i) steady and unsteady flow (ii) uniform and non-uniform
flow (iii) irrotational and rotational flow.
Calculate the velocity components u and v for the following (i) φ = x +y
(ii) φ = x2 + y2
[8]
Derive an expression for the loss of head due to friction in flow through circular
pipes.
A venture meter has its axis vertical, the inlet and throat diameters being 150mm
and 80 mm respectively. The throat has 220mm about inlet and coefficient
discharge is 0.96. Petrol of specific gravity 0.78 flows up through the meter at a
rate of 0.029 m3/s. Find the pressure difference between the inlet and the throat.
[7]
[7]
[8]
[7]
A jet with a velocity V strikes normally on a series of at plates moving with a
velocity KV and mounted radially on the periphery of a wheel. Prove that the
efficiency of the plate is given by η = 2K (1 - K).
[15]
Define (i) Firm and secondary power (ii) Load factor, utilization factor and
capacity factor.
Discuss in detail the different components of hydroelectric power plants.
{7}
A Pelton wheel operates with a jet of 150mm diameter under the head of 500m. Its
mean runner diameter is 2.25 m and it rotates with speed of 375 rpm. The angle of
bucket tip at outlet as150 coefficient of velocity is 0.98, mechanical losses equal to
3% of power supplied and the reduction in relative velocity of water while passing
through bucket is 15%. Find (a) the force of jet on the bucket, (b) the power
developed (c) bucket efficiency and (d) the overall efficiency.
15
1 of 2
||''''|||''|'''||''|
[8]
Code No: R21021
7
a)
b)
8
a)
b)
R10
SET - 1
Define specific speed of a turbine. Derive the expression for the specific speed of
turbine.
Briefly explain about the water hammer in pipes. Discuss the water hammer in
penstock.
7
How will you obtain an expression for the minimum speed for starting a
centrifugal pump?
The diameter of an impeller of a centrifugal pump at inlet and outlet are 300mm
and 600 mm respectively. The velocity of ow at outlet is 2.5 m/s and vanes are set
back at an angle of 45o at outlet. Determine the minimum starting speed of the
pump if the manometric efficiency is 75 %.
7
2 of 2
||''''|||''|'''||''|
8
8
Code No: R21021
R10
SET - 2
II B. Tech I Semester Supplementary Examinations, June - 2015
FLUID MECHANICS AND HYDRALICS MACHINES
(Com. to EEE, ME, MM)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~
1 a)
b)
2 a)
b)
3 a)
b)
4 a)
b)
5 a)
b)
Define surface tension. Discuss how some insects walk on the surface of the
fluid.
Air is introduced through a nozzle into a tank of water to form a stream of
bubbles. If the bubbles are intended to have a diameter of 2 mm, calculate how
much the pressure of the air at the tip of the nozzle must exceed that of the
surrounding water. Assume that the value of surface tension between air and
water as 72.7 x 10-3 N/m.
[8]
[7]
Write a short note on, Uniform and non uniform flow with suitable example
[7]
Calculate the unknown velocity components so that they satisfy continuity
equation. (i) u = 2x2; v = xyz; w = ?
[8]
Write a short note on Flow Nozzle, Turbine flow meter, Darcy Weisbach
Equation
A 150mm X 75mm venture meter with a coefficient of discharge o 0.98 is to be
replaced by an orifice meter having a coefficient of discharge o 0.60.If the both
the meters are to give the same differential mercury manometer reading for a
discharge of 100 liters per second and the inlet diameter is to remain 150mm.
what should be diameter of the orifice.
[7]
Derive the expression for the force exerted by a jet of water on inclined fixed
plate in the direction of jet.
A jet of water strikes with a velocity of 35m/s a at plate inclined at 300 with
the axis of the jet. If the cross-sectional area of the jet is 25cm2 determine.
(i). The force exerted by the jet on the plane
(ii). The components of the force in the direction normal to the jet.
(iii). The ratio in which the discharge gets divided after striking the plate.
[7]
Discuss in detail about flow duration curve and mass curve.
[7]
[8]
[8]
Discuss the hydroelectric power development in India. Write about any one major [8]
hydroelectric power station in Andhra Pradesh.
1 of 2
||''''|||''|'''||''|
Code No: R21021
6 a)
R10
SET - 2
Differentiate between Impulse turbine and Reaction turbine.
[7]
A Powerhouse is equipped with impulse turbines of Pelton type. Each turbine
delivers a power of 14 MW when working under a head 900 m and running at
600 rpm. Find the diameter of the jet and mean diameter of the wheel. Assume
that the overall efficiency is 89%, velocity coefficient of jet 0.98, and speed ratio
0.46.
[8]
7 a)
By means of a neat sketch explain the governing mechanism of Francis turbine.
[6]
b)
A water turbine delivering 10MW power is to be tested with the help of a
geometrically similar 1:8 model which runs at the same speed as the prototype.
(i) Find the power developed by the model assuming the efficiency of the model
and the prototype are equal .
(ii) Find the ratio of the heads and the ratio of mass flow rates between the
prototype and the model.
[9]
How is the selection of pumps made? Give the operational difficulties commonly
experienced in centrifugal pumps and their remedies.
A single acting reciprocating pump running at 30rpm delivers 0.02 m3/s of
water. The diameter of the piston is 250mm and stroke length 500mm determine:
(i). The theoretical discharge of the pump.
(ii). Co-efficient of discharge.
[7]
b)
8 a)
b)
2 of 2
||''''|||''|'''||''|
[8]
Code No: R21021
R10
SET - 3
II B. Tech I Semester Supplementary Examinations, June - 2015
FLUID MECHANICS AND HYDRALICS MACHINES
(Com. to EEE, ME, MM)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~
1 a)
b)
2 a)
b)
3 a)
b)
4 a)
b)
5 a)
b)
Define Specific weight, mass density, vapour pressure and bulk modulus with
appropriate dimensions and units.
A tape of 0.015 cm thick and 1.00 cm wide is to be drawn through a gap with a
clearance of 0.01cm on each side. A lubricant of dynamic viscosity 0.021 Ns/m 2
completely fills the gap for a length of 80 cm along the tape. If the tape can
withstand a maximum tensile force of 7.5 N calculate the maximum speed with
which it can be drawn through the gap.
[8]
Derive Bernoulli`s equation from Euler`s equation of motion.
[8]
A pipe through which water is flowing, is having diameters, 20cm and 10cm at
the cross-sections 1 and 2 respectively. The velocity of water at section 1 is given
as 4 m/s. Find the velocity head a sections 1 and 2 and also rate of discharge.
[7]
What are the different losses in flow through the circular pipes.
[7]
A pipe is 50mm diameter is 6m long and the velocity of flow of water in the pipe
is 2.5m/s. what loss of head and corresponding power would be saved if the
central 2m length of the pipe is replaced by 75mm diameter pipe, the change of
section being sudden. Assume f = 0.04 for both the pipe.
[8]
Find an expression for the force exerted by a jet on stationary curved plate,
when the jet strikes the curved plate at the center.
A jet of water of diameter 5 cm moving with a velocity of 40 m/s strikes a
curved fixed symmetrical plate at the center. Find the force exerted by the
jet of water in the direction of the jet, if the jet is detected through an angle
of 1200 at the outlet of the curved plate.
[6]
What are the different components of hydro power plant? what are the purposes
of providing them.
What is meant by mass curve and explain in detail the construction of mass curve
[7]
1 of 1
||''''|||''|'''||''|
[7]
[9]
[8]
Code No: R21021
6 a)
R10
SET - 3
Discuss the classification of Hydraulic turbines.
[8]
b)
A Francis turbine has a wheel diameter of 1.2 m at the entrance and 0.6m at the
exit. The blade angle at the entrance is 900 and the guide vane angle is 150. The
water at the exit leaves the blades without any tangential velocity. The available
head is 30m and the radial component of flow velocity is constant. What would
be the speed of wheel in rpm and blade angle at exit? Neglect friction.
[7]
7 a)
What do you understand by characteristic curves of Francis turbine? Discuss in
detail.
A model Francis turbine 1/5 of its full size, develops 3kW power at360 rpm
under a head of 1.8m. Find the speed and power of full size turbine operating
under head of 6m, if (i) the efficiency of the model and the full size turbine are
same, (ii) the efficiency of the model turbine is 75% and the scale is considered.
[7]
What do you mean by characteristic curves of centrifugal pumps? What is
the significance of characteristic curves? Draw the following characteristics
curves for centrifugal pump: Head, Power and Efficiency versus discharge with
constant head.
Two homologous pumps A and B will run at same speed of 600 rpm. The
discharge and head of pump A are 0.4 m3 / sec and 50 m respectively. Determine
the discharge of pump B to lift the discharge by 30 m.
[8]
b)
8 a)
b)
2 of 2
||''''|||''|'''||''|
[8]
[7]
Code No: R21021
R10
SET - 4
II B. Tech I Semester Supplementary Examinations, June - 2015
FLUID MECHANICS AND HYDRALICS MACHINES
(Com. to EEE, ME, MM)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~
1 a)
b)
2 a)
b)
3 a)
b)
4 a)
b)
5 a)
b)
Distinguish between atmospheric, gauge and vacuum pressure. What do you
understand by equality of pressure at the same level in a static fluid?
Two pipes on the same elevation convey water and oil of specific gravity 0.88
respectively. They are connected by a U-tube manometer with the manometric
liquid having a specific gravity of 1.25. If the manometric liquid in the limb
connecting the water pipe is 2 m higher than the other find the pressure difference
in two pipes.
[8]
What are the different energies of flowing fluid? Explain each of them
[8]
Water is flowing through a pipe having diameters 20cm and 10cm at sections 1 and
2 respectively. The rate of flow through pipe is 40 liters/second. The section 1 is
6m above the datum and section 2 is 4m above the datum. If the pressure at section
1 is 40 N/cm2, find the intensity of pressure at section 2.
[7]
Explain with neat sketch the Reynold’s experiment and define Laminar and
Turbulent flow.
A compound piping system consists of a1600m of 0.4m diameter, 1200m of 0.3m
diameter and 800m pf 0.25m diameter cast iron pipes connected in series. Convert
the system to (i) an equivalent length of 0.4m pipe and (ii) an equivalent size pipe
3000m long.
[7]
Show that the efficiency of a free jet striking normally on a series of plates fixed
mounted on the periphery of wheel never exceeds 50%.
What do you understand by velocity triangles? Why these are important in
hydraulic turbines?.
[8]
What are the different types of Hydropower plants? Explain each.
[8]
Differentiate between power house with pondage and power house with storage
with neat diagrams.
[7]
1 of 2
||''''|||''|'''||''|
[7]
[8]
[7]
Code No: R21021
R10
SET - 4
6
In a vertical shaft inward-flow reaction turbine, the sum of the pressure and kinetic
head at entrance to the spiral casing is 120 m and the vertical distance between this
section and the tail race level is 3 m. The peripheral velocity of the runner at entry
is 30m/s, the radial velocity of water is constant at 9m/s and discharge from the
runner is without swirl. The estimated hydraulic losses are (a) between turbine
entrance and exit from the guide vanes 4.8 m(b) in the runner 8.8m (c) in the draft
tube 0.79 m (d) kinetic head rejected to the tail race 0.46m. Calculate the guide
vane angle and the runner blade angle at inlet and the pressure heads at entry to and
exit from the runner.
[15]
7 a)
A large hydraulic turbine is to generate 300KW at 1000rpm under a head of 40m.
For initial testing, a 1:4 scale model of the turbine operates under a head of 10m.
Find the power generated by the model.
What are the unit and Specific quantities? What is the significance of these
quantities hydraulic turbines? Define the specific speed of hydraulic turbine.
[7]
Explain the terms: slip and negative slip with reference to reciprocating pump.
[6]
A centrifugal pump delivers water against a net head of 10 m at a speed of 1000
rpm. The vanes are curved backward and make an angle of 30 degrees. The
impeller outside diameter is 30 cm and has a width of 5 cm at the outlet. Determine
the discharge if manometric efficiency is 95%.
[9]
b)
8 a)
b)
2 of 2
||''''|||''|'''||''|
[8]
Code No: R21022
R10
SET - 1
II B. Tech I Semester Supplementary Examinations, June - 2015
MANAGERIAL ECONOMICS AND FINANCIAL ANALYSIS
(Com. to EEE, ME, ECE, EIE, CSE, IT, ECC, BME)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~~~
1.
a) “Managerial Economics is the integration of economic theory with business practice for
the purpose of facilitating decision making and forward planning by management”.
Explain?
b) Define demand and describe its determinants with suitable examples?
2.
a) Differentiate between the following:
i) Point Price elasticity of demand and Arc Price elasticity of demand
ii) Elasticity of demand and elasticity of supply
b) Write briefly about trend projection method?
3.
a) What is the relationship between firm’s short run production function and its fixed and
variable costs?
b) Distinguish between:
i) Implicit and Explicit costs
ii) Accounting and Economic costs
4.
a) What are the features of Perfect competition?
b) Distinguish between Market skimming pricing and penetrating pricing.
5.
a) What are the features of Joint stock Company?
b) Write short note on features of Business cycles.
1 of 2
||''''|||''|'''||''|
R10
Code No: R21022
6.
SET - 1
The following are the balances extracted from the books of Rakesh on 31st March 2015.
PARTICULARS
Rakesh Capital
Rakesh Drawing
Furniture and Fixtures
Opening Stock
Debtors
Rent from tenants
Purchases
Sales
Electricity Charges
Sales return
Discounts (Dr)
Bank Overdraft
Creditors
Discount (Cr)
Taxes and Insurances
General Expenses
Salaries
Commission (Dr)
Carriage on purchases
Bad debts
AMOUNT (IN RUPEES)
30,000
5,000
2,600
22,000
18,000
1,000
1,10,000
1,50,000
1,100
2,000
1,600
4,200
13,800
2,000
2,000
4,000
9,000
2,200
1,800
800
Adjustments:
Closing stock at the end was Rs 20,060; Depreciate furniture and fixtures by Rs 550.
Prepare Trading, Profit and Loss account and Balance Sheet for the year ended 31st March
2015 after taking the above adjustments.
7.
From the following particulars you are required to prepare a statement of proprietary fund:
Capital turnover ratio=2; Fixed Asset turnover ratio=4; Gross profit turnover ratio=20%; Stock
velocity=5; Debtors velocity= 3 months; Creditors velocity is 2.5 months. The gross profit is
Rs 50,000,Reserves and Surplus is Rs 15000 and closing stock was Rs 5000 lesser than
opening stock.
8.
Explain briefly the various methods of capital budgeting.
2 of 2
||''''|||''|'''||''|
Code No: R21022
R10
SET - 2
II B. Tech I Semester Supplementary Examinations, June - 2015
MANAGERIAL ECONOMICS AND FINANCIAL ANALYSIS
(Com. to EEE, ME, ECE, EIE, CSE, IT, ECC, BME)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~~~
1.
What do you understand by Elasticity of demand? How do you measure it? What is its
significance?
2.
Explain and illustrate the following: and also mention why they arise: a) The Law of Constant
Returns b) The Law of increasing returns.
3.
What is opportunity Cost? Give some examples of opportunity cost. How are these costs
relevant for managerial decisions?
4.
What is a Market? Explain, in brief, the different Market structures.
5.
Explain the merits and demerits of different forms of Business organization and their suitability
with different types of business Activities
6.
What are the accounting concepts that govern accounting process? Explain in brief.
7.
The following are the extracts from the financial statements of Marvel Ltd. as on 31st March
2014 and 31st March 2015 respectively
31st March 2014
31st March 2015
( Amount in Rupees) ( Amount in Rupees)
Stock
10,000
25,000
Debtors
20,000
20,000
Bills receivable
10,000
5,000
Cash
18,000
15,000
Bills payable
15,000
20,000
Bank Overdraft
2,000
9% Debenture
5,00,000
5,00,000
Sales
3,50,000
3,00,000
Gross Profit
70,000
50,000
Compute Current ratio, Acid test ratio and Stock Turnover ratio and also interpret the result.
8.
Compare and contrast with illustration
Accounting rate of return and Payback period method
Net present Value and IRR method
1 of 1
||''''|||''|'''||''|
Code No: R21022
R10
SET - 3
II B. Tech I Semester Supplementary Examinations, June - 2015
MANAGERIAL ECONOMICS AND FINANCIAL ANALYSIS
(Com. to EEE, ME, ECE, EIE, CSE, IT, ECC, BME)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~~~
1.
Define Managerial Economics. Explain the nature and scope of managerial economics?
2.
What is meant by Elasticity of demand? What are the factors governing the potential demand
for a product as either Elastic or Inelastic?
3.
Explain how production function is valuable to manufacturer?
4.
What are the features of perfect competition? Explain with the help of a diagram how price
output is determined in perfect competition?
5.
Define and evaluate partnership form of business organization.
6.
What is working capital? What are the factors governing working capital requirement?
Illustrate.
7.
Ram Enterprise is considering purchasing a CNC machine. The following are the earnings after
tax from the two alternative proposal under consideration each costing Rs 8,00,000. Select the
better proposal if the company wishes to operate @ 10% rate of return
Year 1
Year 2
Year 3
Year 4
Year 5
Proposal I
80,000
2,40,000 3,20,000 4,80,000 3,20,000
Proposal 2
2,40,000 3,20,000 4,00,000 2,40,000 1,60,000
Present value of Rs 1 @10%
0.909
0.826
0.751
0.683
0.620
8.
Journalize the following transactions and post them to ledger.
i) Ram invested Rs 10,000 in cash
ii) He bought goods worth Rs 2000 from Shyam
iii) He bought a machine for Rs 5000 from Lakshman on account
iv) He paid to Lakshman Rs. 2000
v) He sold goods for cash Rs. 3000
vi) He sold goods to A on account for Rs 4000
vii) He paid to Shyam Rs. 1000
viii)He received amount from A Rs. 2000.
1 of 1
||''''|||''|'''||''|
Code No: R21022
R10
SET -4
II B. Tech I Semester Supplementary Examinations, June - 2015
MANAGERIAL ECONOMICS AND FINANCIAL ANALYSIS
(Com. to EEE, ME, ECE, EIE, CSE, IT, ECC, BME)
Time: 3 hours
Max. Marks: 75
Answer any FIVE Questions
All Questions carry Equal Marks
~~~~~~~~~~~~~~~~~~~~~~~~~~
1. a) What do you understand by demand? What are the different types of demand
b) State the law of demand what its exception are
2. How do you forecast demand for product and services? Explain the method of least squares as a
method of forecasting demand.
3. Do you think monopoly is present in the current business environment? Explain how price
output is determined in monopoly in short run
4. Rahim sells 500 kg of sweets per hour at a rate of Rs 100 per kg. The fixed overhead is Rs 7000
and the variable cost is Rs 25 per kg. There is a proposal to reduce the price by 10%.Calculate
the present PV and present BEP both in units and in Rupees; present level of profit and future
PV ratio and BEP both in units and in Rupees. How many kilograms must be sold to earn
present level of profit?
5. Explain any four pricing methods based on strategy.
6. Based on the following information of the financial ratios prepare Balance sheet of Premier
India Ltd as on 31st March 2015.
Current ratio= 2.5; Liquidity ratio= 1.5; Net working Capital= 6,00,000; Stock turnover ratio=
5; Gross profit to sales =20%. Turnover ratio to net fixed assets (on cost of sales) =2; Average
debt collection period = 2.4 months; Fixed asset to net worth =0.8; Long term debt to capital
and Reserves =7:25.
1 of 2
||''''|||''|'''||''|
Code No: R21022
SET -4
R10
7. From the following prepare Trading, Profit and loss and Balance Sheet as on 31st March 2015.
Particulars
Capital
Purchases
Sales
Carriage Inwards
Wages outstanding
Plant
Depreciation on plant
Rent received
Salaries and wages
Reserve for bad and doubtful debt
Bad debts
Interest
Premises
Interest paid
Creditors
Opening stock
Loans
Debtors
Debit
Credit
20000
29000
55000
5000
2000
20000
4000
1000
3000
1000
2000
5000
20000
5000
6000
25000
38000
15000
Adjustment
Closing stock at the end: Rs 40,000
Depreciate building at the rate of 15% per annum.
8. A ltd is considering to purchase a new machine costing Rs 5,85,000. An additional investment
will be required for installation costing Rs 15,000 and for working capital Rs 1,00,000. The
machine has a working life of 5 years and salvage value will be Rs 1,00,000. The working
capital will be released after 5 years. The estimated cash inflows before depreciation and tax are
estimated as follows
Years
Cash Inflows (Rupees)
1
1,00,000
2
1,80,000
3
2,50,000
4
2,00,000
5
1,50,000
You can assume straight line method for charging depreciation, cost of capital of 15% and
corporate tax rate of 50%. Should the company purchase the machine?
2 of 2
||''''|||''|'''||''|