7N264B
CLASS: B.SC. ELECTRONICS
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
V
2005
04UEL528
SUBJECT
COMMUNICATION SYSTEM – I
SECTION – A
Answer all the questions:
10 x 3 = 30
1. State the expression of Fourier series.
2. Define Thermal Agitation noise.
3. What is amplitude modulation?
4. What is single sideband suppressed carrier (J3E) modulation?
5. Draw the diagram of varactor diode modulator.
6. What are the functions of FM Stereo transmitter?
7. Explain briefly the balanced modulator carrier.
8. What are diode mixers?
9. Define PAM.
10.What is ASK?
SECTION – B
Answer all the questions:
5 x 14 = 70
11. a. Explain the trigonometric Fourier series for periodic wave form and also the spectrum for
trigonometric Fourier series.
(OR)
b. i) Fast Fourier Transform (FFT)
ii) Inverse Fast Fourier Transform (IFFT)
12. a. Discuss different types of modulation in detail and also find how the percentage of modulation is
calculated?
(OR)
b. Explain FM signal spectrum in detail and also determine how the percentage is calculated?
13. a. Write short notes on: i) Reactance modulator
ii) VCO modulator
(OR)
b. Explain the function of Armstrong FM system with a neat block diagram.
14. a. Draw the neat diagram of Foster – Seeley discriminator explain in detail.
(OR)
b. i) IF selection and Images
ii) Dual gate Mosfet mixer.
15. a. Describe Pulse width modulation and explain the wave forms derived from PWM.
(OR)
b. Write a note on:
i) FSK
ii) PSK.
****************
iii) Pindiode modulator
7N403A
CLASS: P.G. E.D.C.
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
III
2006
04PEL362
SUBJECT
COMPUTER HARDWARE
SECTION – A
Answer all the questions:
20 x 1 = 20
1. In passive motherboard, the add-in-cards are referred as ____________ boards.
a) system
b) main
c) daughter
d) planar
2. The external ports mounted on a motherboard’s back panel are set by its _____________
a) form factor
b) size
c) shape
d) connector
3. The chipset provides necessary _______ for the microprocessor to communicate with the motherboard.
a) signal
b) control
c) protocols
d) none of the above
4. The ________ holds the date and time of PC which is displayed on the monitor.
a) system clock
b) real-time clock
c) real clock
d) time clock
5. When the computer boots up, the ___________ is behind the scenes taking care of all the details of the
boot sequence.
a) POST
b) ROM
c) PROM
d) BIOS
6. CMOS, which is also known as ______________.
a) NVRAM
b) NVROM
c) NVPROM
7. The POST process is not performed on a __________________ boot.
a) cold
b) warm
c) system
d) NVSDRAM
d) none of the above
8. If the computer has an environmental monitoring system this option displays the _______ temperature.
a) Slot’s
b) socket’s
c) CPU’s
d) mother board’s
9. A sector is ___________ bytes in length.
a) 521
b) 522
c) 513
d) 512
10. In hard disk, _____________read / write heads are an enhanced version of ferrite heads.
a) Thin-film
b) Magneto-resistive
c) metal-in-gap
d) magnetic
11. The _____________ is the most commonly used encoding method in hard disk.
a) FM
b) RLL
c) MFM
d) none of the above
12. Sampling rate of CD – DA recording is ________________.
a) 41.4 KHZ
b) 44.0 KHZ
c) 44.1 KHZ
d) 40.1 KHZ
13. The USB devices can be connected and disconnected while the PC is powered ON is ____________.
a) PnP
b) Hot swapping
c) EPP
d) none of the above
14. The distance between IR devices must be atleast ____________ inches.
a) 7
b) 3
c) 5
d) 6
P.T.O.
/2/
15. PCMCIA is ______________.
a) Personal Connector Machine Control In Architecture
b) Personal Computer Memory Card International Association
c) Programmable Computer Memory Card Industry Architecture
d) Programmable Computer Memory Card International Association
16. The number of pixels in a monitor display represents its _____________.
a) size
b) viewing angle
c) resolution
d) none of the above
17. The speed of the printer is measured in ______________
a) CPS
b) PCS
d) PSC
c) SCP
18. The __________________ key is generally used to erase a single character to the right of the cursor.
a) backspace
b) tab
c) spacebar
d) delete
19. In opto-mechanical mouse, the encoding disks has ___________ holes.
a) 36
b) 35
c) 63
d) 53
20. The newer optical mouse capture ___________ images per second of the surface under the mouse.
a) 1,200
b) 1,500
c) 1,600
d) 1,100
SECTION – B
Answer all the questions:
5 x 4 = 20
21. a. Explain the different bus architectures used in PC?
(OR)
b. Explain the North Bridge and South Bridge of chipsets.
22. a. Explain the three primary functions performed by BIOS.
(OR)
b. Discuss the IDE configurations submenus in extended system configuration data.
23. a. Explain the four types of read / write heads used in hard disk.
(OR)
b. Write down the Red – Book standard characteristics for a CD – DA recording.
24. a. Discuss the USB interface features and its type.
(OR)
b. Explain the two light source used in LCD.
25.a.
Explain the three type qualities used in printer.
(OR)
b. Write a note on:
i) Insert key
ii) Delete key
iii) Home and End key
iv) Page up and Page down key
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26. List out the different types of connector used in motherboard and discuss in detail.
27. Explain the steps performed by BIOS in boot sequence.
28. Explain the basic organization elements on hard disk and also the data encoding methods.
29. Discuss the Passive Matrix LCD in detail.
30. Discuss the types and operation of MOUSE in detail.
****************
7N268B
CLASS: M.SC. ELECTRONICS
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
I
2007
07PEL121
SUBJECT
SIGNAL AND SYSTEM
SECTION – A
Answer all the questions:
20 x 1 = 20
1. A signal x(t) is referred to as an ‘even’ signal if it is identical to its time – reversed counterpart.
(True or False)
2. The equation u (t ) 
0,
t o represents
1,
t 1
a) unit impulse
b) unit step sequences
c) unit step function
d) ramp function
3. A linear system, in continuous time, is a system that possesses the important property of
a) super-position
b) additive
c) scaling
d) homogeneity
4. A system is said to be non-causal if the output depends upon past and present inputs only.
(True or False)
5. The following equation is the ______________ property of the discrete time unit impulse.

x[n ]  x[k ] [ n  k ]
k  
a) commutative
6. The equation y[n ] 
b) associative
c) distributive
d) sifting

 x[k ] h( n  k ) is referred to as
k  
a) convolution sum
b) sifting property
c) superposition
d) either (a) or (c)
7. Which one of the following is the associative property of convolution?
a) y(t) = h(t) * x(t)
b) x(t) = x(t) * h(t)
c) x (t ) h(t ) h1 ( t ) * h2 ( t ) y (t )
d) x (t ) h1 (t ) h2 ( t ) y (t )
8. In discrete time, the impulse response h1(n) of the inverse system for an LTI system with impulse
response h(n) must satisfy
a) h(n) * h1(n) = (n)
b) h( n ) * h1 ( n )  1
c) h(n)-1 * h1(n) = (n)
1
d) h( n ) * h1 ( n ) ( n )
(n)
9. Which one of the following function is the Bilateral Laplace Transform function?


 st dt
b) F ( s ) f ( t )e  st dt
a) F ( s ) f ( t )e
0

0
c) F ( s ) f ( t )e  st dt
0
d) none of the above
P.T.O.
/2/
10. The laplace transform of a unit step function will be
1
1
1
a)
b)
c)
s a
s2
s
d)
11. The Laplace transform of a ramp function is
1
1
1
a)
b)
c)
s a
s2
s
1
sa
d)
1
s2 a
12. The z – transform is the effective tool used for the analysis of ___________ signals.
a) continuous time
b) discrete time
c) analog
d) radio
13. The Parse Val’s relation states that the average power in a periodic signal equals the sum of the average
powers in all of its harmonic components. (True or False).
14. A signal for which the system output is constant times the input is referred to as
a) eigen value
b) eigen function
c) amplitude factor d) all of the above
15. The ‘aliasing effect’ arises due to
a) over sampling
b) under sampling
c) high pass filtering d) low pass filtering
16. The sampling theorem requires that
a) w s 2 wm
b) w s 2 wm
c) wm 2 w s
d) w s 
1
2 wm
17. The multiplication property of the continuous time Fourier Transform is sometimes referred to as
a) Frequency modulation
b) amplitude modulation
c) phase modulation d) convolution
18. The Fourier Transform of the unit step function is
a)
1
j 4f
b)
1
j 2f
c)
1
2f
d)
j
2f
19. The Discrete time Fourier Transform of is [δ(n) – Dirac Delta function]
a)  jwno
b) jwno
e
e
c) 1
d) zero
20. If x[n] is the discrete time signal, its energy density spectrum is
a) | x ( e jw ) |2
b) | x ( n ) |2
c) | x 2 ( n ) |
d) none of the above
SECTION – B
Answer all the questions:
5 x 4 = 20
21. a. Check whether the signal given by the following equation is periodic
cos(t ),
x (t )
sin(t ),
t0
t 0
(OR)
b. Consider a system S whose input x(t) and output y(t) related by y(t) = tx(t). Determine whether or
not S is linear.
22. a. Check the stability of a system with pure time shift in continuous time given by


| h() | d( t 0 )d1


(OR)
b. Explain the associative property of convolution in discrete – time continuous time.
P.T.O.
/3/
23. a. Find the Laplace Transform of Sin (wt).
(OR)
b. Find the Z – Transform of (i) 1 and (ii) an.
24. a. Prove that the continuous time periodic signal is a linear combination of harmonically related
complex exponentials.
(OR)
b. Explain the ‘time reversal’ property of continuous time Fourier series.
25.a.
Prove that the continuous time Fourier transform of a periodic signal with Fourier series coefficients
ak can be interpreted as a train of impulses occurring at harmonically related frequencies.
(OR)
b. Write a note on ‘multiplication property’ of Discrete time Fourier Transform.
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26. Explain continuous time and discrete time systems with suitable examples for each. Describe any two
properties of continuous time and discrete time systems.
27. Describe the Discrete time impulse response and the convolution sum representation of Linear Time
Invariant systems.
28. Solve the differentiation equation using Laplace Transform.
y (t ) 4 y ( t ) 5e  t
Subject to the initial conditions
Y(0) = 2 and y (0) 3
29. Describe Impulse Train sampling and hence develop sampling theorem for low pass signals.
30. Explain the following properties of continuous time Fourier Transform.
i) Conjucation and conjugate symmetry.
ii) Differentiation and Integration
iii) Duality.
****************
7N265B
CLASS: B.SC. ELECTRONICS
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
V
2005
04UEL529
SUBJECT
LINEAR INTEGRATED CIRCUITS
SECTION – A
Answer all the questions:
10 x 3 = 30
1. What is the difference among SSI, MSI, LSI and VLSI ICS?
2. List the basic processes used in the silicon planar technology.
3. Explain CMRR.
4. What is an instrumentation amplifier?
5. Explain the function peak detector.
6. Explain the operation of negative clipper with clear circuit.
7. Design a low pass filter at a cut off frequency of 1KHz with a pass band gain of 2.
8. Draw the circuit of Saw tooth wave generator.
9. Give the principle of PLL.
10. Write the advantages of successive approximation method of A/D conversion.
SECTION – B
Answer all the questions:
5 x 14 = 70
11. a. Explain fabrication process of ICS with clear diagrams.
(OR)
b. Describe the various methods used for depositing thin films and also explain thick film technology.
12. a. Draw the dc equivalent circuit of the dual-input balanced output differential amplifier and analyse it
to derive the equations for emitter current and collector to emitter voltage.
(OR)
b. With neat diagrams, explain the operation of
i) Inverting amplifier
ii) Summing amplifier
iii) Differentiator
13. a. Explain the function of sample and hold circuit with clear circuit diagram. Give the uses of the
circuit.
(OR)
b. Explain the Schmitt trigger circuit using op – amp and draw the input and output waveforms.
14. a. Describe the working of square wave generator using op – amp.
(OR)
b. Write notes on: (i) Wide Band – Pass filter
(ii) Narrow Band Pass filter.
15. a. Explain the operation of an astable multivibrator using 555 timer with clear circuit and waveforms.
(OR)
b. What are the disadvantages of binary weighted Resistor method of D / A conversion. Explain
R – 2R ladder method of D / A conversion.
****************
7N272A
CLASS: M.SC. ELECTRONICS
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
III
2006
04PEL329
SUBJECT
DIGITAL SIGNAL PROCESSING
SECTION – A
Answer all the questions:
20 x 1 = 20
1. If the pattern of the signal is regular and can be characterized mathematically then the signal is called
a) Deterministic
b) non-deterministic
c) periodic
d) aperiodic

2. A function defined by (t ) 0 , t 0 and (t )dt 1 is called

a) unit step function
b) unit impulse function
c) unit ramp function
d) unit pulse function
3. The power signal is one which has finite average power and infinite energy. (True or False)
4. The response of the LTI system as a function of input signal and impulse response is called
a) Convolution sum
b) correlation sum
c) Time reversal
d) none of the above
5. A non-linear system satisfies the super position principle. (True or False)
6. The folded sequence of x2 (-3, (mod 4)) is
a) x2(0)
b) x2(1)
c) x2 (2)
d) x2(3)
7. Fast Fourier transform uses
a) symmetry property
c) both a and b
d) none of the above
b) periodicity property
8. The number of complex multiplications required using FET is given by
N
c) N2
b) log 2 N
log 2 N
a)
2
d) 2N log 2 N
9. The delayed response of the filter as a function of to a signal is called
a) Group delay
b) phase delay
c) time delay
d) frequency delay
10. Which of the filter cannot be constructed using approximation of derivatives?
a) high-pass filter
b) band reject filter
c) both a and b
d) none of the above
11. Which effect will encounter the Bilinear transformation method
a) Gibbs phenomenon
b) frequency wrapping
c) down sampling
d) up sampling
12. Cheby Shev filter is a high pass filter. (True or False)
13. The process of reducing the sampling rate of a signal is called
a) decirmation
b) interpolation
c) a and b
d) sampling conversion
14. Multirate signal processing is used when the data has to be handled in same rate. (True or False)
15. The stem function in the Mat lab does __________operation.
a) plotting
b) memory allocation
c) both
d) none
16. MAT LAB stands for
a) Maths Laboratory
d) None of the above
b) Matrix Laboratory
c) Material Lab
P.T.O.
/2/
17. The function of TC bit is to store the result of
a) ALU
b) PLU
c) both a & b
d) none
18. The function of HM bit is for
a) Half mode
b) Hold mode
c) Hyper thread mode
d) none of the above
19. In Image processing histogram modification is done on pixel by pixel basis and used in
a) contrast equalization b) colour equalization c) Edge equalization
d) none of the above
20. The RADAR range is directly proportional to the
a) Antenna width
b) Beam width
c) Pulse repetition interval
d) none of the above
SECTION – B
Answer all the questions:
5 x 4 = 20
21. a. Explain the linear and non-linear systems with examples.
(OR)
b. Explain the properties of a DSP system.
22. a. Explain the Linear convolution and Circular convolution.
(OR)
b. Compute the Linear convolution for sequences x1 (n) = {1, 1, 2, 2) and x2 (n) = {1, 2, 3, 4}
23. a. Write a note on Magnitude and phase response of the filter.
(OR)
b. Write a note on Butter worth filters.
24. a. Explain sampling rate conversion.
(OR)
b. Write a Mat Lab program for circular convolution.
25.a.
Explain the application of DSP in RADAR field.
(OR)
b. Explain the application of DSP in Image processing.
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26. Explain with a neat diagram the various stages of Analog to Digital conversion of signals.
27. i) Determine the DFT of the sequence x ( n ) 1 4
for
0 n 2.
ii) Compute the circular convolution of the sequences x1(n) = {1, 1, 2, 2) and x2(n) = {1, 2, 3, 4} by
Graphical method. Verify it by the matrix method.
28. List the different types of designing procedures for IIR filter and explain each in detail.
29. Explain the process of Decimation and Interpolation with necessary diagrams.
30. i) Explain the architecture of the Digital signal processor with a neat diagram.
ii) Explain voice processing with necessary diagram.
****************
7N269A
CLASS: M.SC. ELECTRONICS
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
I
2007
07PEL122
SUBJECT
DESIGN OF ANALOG CIRCUITS
SECTION – A
Answer all the questions:
20 x 1 = 20
1. When the E / B junction of a transistor is reverse – biased, collector current
a) is reversed
b) increases
c) decreases
d) stops
2. Answer True or False:
Irrespective of transistor configuration, emitter current equals the sum of base current and collector
current.
3. In the case of a bipolar transistor, is
a) positive and > 1
b) negative and < 1
c) positive and < 1
d) negative and > 1
4. The h – parameters are called hybrid because they
a) are obtained from different characteristics
b) are mixed with other parameters
c) apply to circuits contained in a block box
d) are define by using both open and short circuit terminations
5. Low frequency response is affected by
a) size of the coupling capacitor
b) input resistance
c) current gain
d) input impedance
6. Answer True or False: The emitter follower is an example of voltage – series feed back.
7. In CB configuration, the dc alpha (αdc) of a transistor is given by
 IC
I
I
a) dc C I
b) dc 
c) dc E I
IE
E
8. The trans conductance of a transistor is defined as
 IC
 IC
a) g m 
b) g m 
 VBE
 VCE
c) g m 
d) dc 
 IE
IC
C
 VBE
 IC
d) g m 
 VCE
 IC
9. Answer True or False: In a JFET Pinch – off means current –off.
10.A FET consists of
a) source
b) drain
11. In a JFET, drain current is maximum when VGS is
a) zero
b) negative
c) gate
d) all of the above
c) positive
d) equal to Vp
12. Answer True of False:
The common – gate amplifier has a characteristically low input resistance and a high output resistance.
13. In the following which configuration is inherently more stable and ideally suited for high frequency
applications.
a) CC – CC
b) CC – CE
c) CE – CB
d) CC – CB
14. Answer True or False:
The cascade amplifier provides a large amount of voltage gain at higher frequencies.
15. The voltage gain of a Darlington amplifier is
a) high
b) low
c) very low
d) approximately one
P.T.O.
/2/
16. CMOS family uses only
a) MOSFETS and resistors
b) NMOS circuits
c) MOSFETS
d) bipolar transistors
17. Answer True or False:
If the quality factor Q < 10, we will call the filter a narrow band – pass filter.
18. The best stop band response is in
a) Butter worth filter
b) Chebyshev filter
c) Cauer filter
d) none
19. The type of waveform generated in LC oscillator is
a) Sinusoidal
b) square wave
c) Saw tooth wave
d) triangular wave
20. In a Quadrature oscillator, the frequency of oscillation is given by
a) f o 
1
2RC
b) f o 
1
c) f o 
RC
1
2RC
d) f o 
1
2RC
SECTION – B
Answer all the questions:
5 x 4 = 20
21. a. Explain with a neat diagram the operation of a NPN transistor.
(OR)
b. State the factors on which the h – parameters of a transistor depend.
22. a. What are the characteristics of a CB amplifier?
(OR)
b. Explain the voltage divider bias method.
23. a. For an N – channel JFET, IDSS = 8.7 mA, Vp = -3V, VGS = -1V. find the values of (i) ID (ii) gmo
(OR)
b. Explain with a neat diagram the self-bias method of a JFET.
24. a. Mention the advantages of Darlington pair.
(OR)
b. Explain current mirror circuits with a neat diagram.
25.a.
Define a filter. What are the advantages of active filters over passive ones?
(OR)
b. What is frequency stability? Explain its significance.
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26. Draw the NPN transistor and the hybrid equivalent of the transistor for CB and CE configurations and
explain.
27. Draw the circuit, input and output characteristics of CB connection and explain.
28. Explain the drain and transfer characteristics of a JFET with a neat diagram.
29. What are CMOS devices? Explain its operation with a neat diagram and list out its advantages and
disadvantages.
30. What is a VCO? Explain its operation with a neat block diagram and also draw its output waveforms.
****************
7N262A
CLASS: B.SC. ELECTRONICS
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
I
2007
07UEL121
SUBJECT
SEMICONDUCTOR DEVICES & CIRCUITS – I
SECTION – A
Answer all the questions:
20 x 1 = 20
1. Semi conducting materials have ____________ temperature coefficient of resistance.
a) positive
b) negative
c) neutral
d) high
2. The method used for making _____________ is called as alloying.
a) diode
b) resistor
c) capacitor
d) inductor
3. Forward resistance of a pn junction diode will be in the order of ___________.
a) few hundred Ohms
b) few kilo Ohms
c) mega Ohms
d) zero Ohms
4. In reverse biased diode, the reverse current will increase with respect to __________.
a) Reverse voltage
b) forward voltage
c) unbiased voltage d) none of the above
5. One of the parameter required to select a good rectifier is ______________.
a) Ripple factor
b) very high output voltage c) type of a rectifier
6. A regulated power supply could be built with _____________ diode.
a) varactor
b) light emitting
c) tunnel
7. A photo diode is used for
a) Electrical applications
c) emitting light
d) none of the above
d) zener
b) Heat sensing applications
d) light sensing applications
8. In order to provide electrical isolation __________ is used.
a) zener diode
b) tunnel diode
c) LED
d) Opto isolator
9. A transistor in common – collector configuration is used for
a) amplification
b) switching
c) impedance matching
d) Audio frequency applications
10. A biased transistor should have _________________ Q. point.
a) stabilized
b) no
c) fluctuating
d) temperature dependent
11. The best way to bias a transistor to work as an amplifier is _________________.
a) CE configuration
b) base resistor method
c) feed back method d) none of the above
12. For faithful amplification, Q point should be in _________ region of load line.
a) saturation
b) active
c) cut off
d) any
13. JFET is a ___________ controlled device.
a) voltage
b) current
c) power
d) resistance
14. JFET has input impedance in the order of
a) kilo ohms
b) Ohms
c) mega ohms
d) zero ohms
15. A MOSFET uses the electric field of a ____________ to control the channel current.
a) capacitor
b) battery
c) generator
d) resistor
P.T.O.
/2/
16. Which of the following devices has the highest input impedance?
a) JFET
b) MOSFET
c) Transistor
d) Diode
17. In SCR, the internal transistors are connected so as to produce
a) positive feed back loop
b) CE configuration c) negative feed back loop
d) amplification
18. When two SCR’s are connected back to back ________ is formed.
a) diode
b) diac
c) triac
d) UJT
19. The normal way to turn on a diac is by _____________.
a) gate current
b) gate voltage
c) break over voltage
d) none of the above
20. When a UJT is turned on, the resistance between emitter terminal & lower base terminal __________.
a) remains the same
b) is decreased
c) is increased
d) none of the above
SECTION – B
Answer all the questions:
5 x 4 = 20
21. a. Explain the method used to increase the current conduction of a semiconductor.
(OR)
b. Write a short note on n – type semiconductor.
22. a. Why the photodiode is connected in reverse bias condition for light sensing applications?
(OR)
b. Write a short note on light emitting diodes.
23. a. Explain the load line of a transistor.
(OR)
b. Write a short note on base bias method.
24. a. Explain the structure of a MOSFET.
(OR)
b. Differentiate a transistor & JFET.
25.a.
Explain the characteristics of a TRIAC.
(OR)
b. Explain the Equivalent circuit of a UJT.
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26. Explain the forward & reverse biasing of a pn junction diode.
27. What is a regulated power supply? Compare it with an ordinary rectifiers. Explain the diode which is
used to produce this regulation.
28. Explain the characteristics of a transistor when it is connected in common emitter configuration.
29. Explain the self-bias & voltage divider bias for JFET.
30. What is the need for power control rectifiers? Explain half wave & full wave controlled rectifiers.
****************
7N389A
CLASS: U.G. ELECTIVE
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
V
2005
04UEL582
SUBJECT
COMPUTER ELECTRONICS
SECTION – A
Answer all the questions:
1. Define the terms:
10 x 3 = 30
i) Palmtop
ii) Mainframe.
2. Write a short note on super computer.
3. i) Find the octal digit of (4010).
4. Explain the following gates:
ii) Find the Binary equivalent of (2016).
i) AND
ii) NOR
5. Briefly explain about Bar Coding.
6. Write a short note on plotters.
7. What is meant by memory?
8. Write a short note on magnetic tapes.
9. Briefly explain about timing & control unit.
10.Define: Cache memory.
SECTION – B
Answer all the questions:
5 x 14 = 70
11. a. Explain the first, second and third generation computers.
(OR)
b. Explain: i) Laptop
ii) Personal computer
iii) work stations
iv) Parallel computer
12. a. Explain about FULL ADDER & FULL SUBTRACTOR with necessary circuit diagram.
(OR)
b. List out the types of shift register and explain with necessary circuit diagram.
13. a. Explain about Floppy Disk unit.
(OR)
b. Explain: i) Printer
14. a.
ii) MICR.
i) Tabulate the difference between ROM and RAM.
ii) Explain about various types of ROM.
(OR)
b. Explain the following terms:
i) SRAM
ii) DRAM
15. a. i) Explain about Hard disk drive.
iii) Magnetic Ferrite core memory
ii) Explain about CDROM drive.
(OR)
b. Explain about the architecture of 8085 with necessary diagram.
****************
iv) Magnetic memory
7N273A
CLASS: M.SC. ELECTRONICS
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
III
2006
04PEL330
SUBJECT
SYSTEM ARCHITECTURE AND INTERFACING
SECTION – A
Answer all the questions:
Choose the Correct Answer:
20 x 1 = 20
1. Mother board contains all of the _______________ system components of a computer.
a) planar
b) primary
c) connector
d) none of these
2. Passive _______________ main board is only a receiver card with open slots.
a) Back plane
b) Front panel
c) board
d) none of these
3. _____________ back plane design is called as intelligent back plane design.
a) passive
b) active
c) connector
d) none of these
4. BIOS in stored in _____________.
a) Floppy disk
b) Hard disk
c) EPROM
d) CD
5. DVD is expanded as _____________
a) Digital Video Disk
b) Digital Versatile Disk
c) Digital Variable Disk
6. Cycle stealing method consumers ____________ clock cycles.
a) 1
b) 2
c) 3
7. SRAM is expanded as
a) Start RAM
b) Static RAM
d) 4
c) none of the above
8. DRAM is expanded as ____________________
a) Dynamic RAM
b) Data RAM
d) all of the above
c) none of the above
9. _____________ of the following is used for Decoding the address
a) Demultiplexer
b) multiplexer
c) decoder
d) all of the above
d) all of the above
d) all of the above
10. The IC 8253 contains ____________ timers.
a) 1
b) 2
c) 3
d) 4
11. The IC 8255 contains _______________ ports.
a) 1
b) 2
c) 3
d) 4
12. PIC 8259 can deal with ____________ number of interrupt sources.
a) 8
b) 16
c) 32
d) 4
13. DMA is expanded as ___________
a) Direct Memory Access b) Direct Mode Access
14. VESA is expanded as _______________.
a) Video Extended Standard Architecture
c) none of the above
c) Digital Mode Adopter d) all of the above
b) Video Electronic Standard Association
d) all of the above
15. USB is expanded as _________
a) Universal Serial Bus b) Universal Synchronous Bus
c) none of the above d) all of the above
State True or False:
16. The speed of the Bus can affect the overall performance of a computer.
17. Cold Boot needs ice cubes.
18. 8086 processor can address 1.2MB of memory.
19. Bi-directional port needs the control word to be altered for INPUT and OUTPUT operations.
20. RS 232 is a methodology.
P.T.O.
/2/
SECTION – B
Answer all the questions:
5 x 4 = 20
21. a. Discuss the mother board form factors in detail.
(OR)
b. Write a note on Chipset characteristics.
22. a. What is BIOS? What is its role in initiating the computer?
(OR)
b. What do you mean by Plug and Play feature?
23. a. Write a note on SRAM.
(OR)
b. Write a note on DRAM.
24. a. Give an example for Interrupt driven I/O.
(OR)
b. Write a short note on Bi-directional port.
25.a.
In what way the 16550 UART plays a role in serial communication.
(OR)
b. In what way RS 232 standard is used?
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26. Explain in detail about all sorts of connectors that are encountered in computers.
27. Give a detailed picture on the technologies of CD and DVD. Also explain that how they are used to
store memory and how the computer reads data from them and writes data on them.
28. Explain the various address decoding techniques in detail.
29. Explain in detail the programmable peripheral interface IC 8255A.
30. Give a detailed account of DMA. Give sufficient details on DMA controller.
****************
7N270B
CLASS: M.SC. ELECTRONICS
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
I
2007
07PEL123
SUBJECT
DESIGN OF DIGITAL CIRCUITS
SECTION – A
Answer all the questions:
20 x 1 = 20
1. _______________ can be used as serial to parallel converter.
a) MUX
b) DEMUX
c) COMPARATOR
d) CODE CONVERTER
2. _____________ is called as data selector
a) MUX
b) DEMUX
c) COMPARATOR
d) CODE CONVERTER
3. IC 7485 is a _______________________
a) MUX
b) DEMUX
c) COMPARATOR
d) CODE CONVERTER
4. 9’s complement of a given number can be obtained by using 1’s complement of the given number.
(True or False)
5. Flip Flop is
a) Asynchronous sequential circuit
c) Combinational circuit
b) Synchronous sequential circuit
d) Astable multivibrator
6. _______________ is the asynchronous input to the JK Flip Flop.
a) clock input
b) J input
c) K input
d) PRESET input
7. If 512 KHz is the input clock frequency to a 4 bit asynchronous counter, then the frequency of the
output at the last stage will be
a) 64 KHz
b) 32 KHz
c) 256 KHz
d) 512 KHz
8. IC 7475 is
a) SR FF
b) D FF
c) JK FF
d) DLatch
9. In Moore model input changes do affect the output of the circuit. (True or False)
10. ASM means
a) Asynchronous Synchronous mode
c) Automatic State Machine
b) Algorithm State model
d) Algorithmic State machine
11. Race becomes critical when
a) Correct next state is reached during state transition
b) uncorrect nextl state is reached during state transition
c) correct next state is not reached during state transition
d) uncorrect next state is not reached during state transition
12. In ______________ mode of asynchronous sequential circuits, only one input is allowed to change at a
time and the inputs are considered to be levels (0 or 1).
13. Static hazard is caused by _______________
a) Delay in combinational circuit
c) Short circuit in combinational circuits
b) Delay in sequential circuits
d) Short circuit in sequential circuits.
14. Essential hazards occurs in
a) combinational circuit
c) both the combinational and sequential circuits
b) sequential circuit
d) all the above
15. Multiple glitches cause static hazards. (True or False)
16. ____________ hazard exists in an asynchronous sequential circuit due to a combination of delay and
design specifications.
P.TO.
/2/
17. A combinational circuit that contains an undetectable fault is said to be ____________
a) error propagation
b) sensitized path
c) redundant
d) fault collapse
18. TMR means
a) Tripel modular redundancy
c) Toggle modular redundancy
b) Trouble modular redundancy
d) Twinkle modular redundancy
19. Structured fault model assume that components are fault free and only their interconnections are
affected.(True or False)
20. A combinational circuit in which all stuck faults are detectable is said to be _______________.
SECTION – B
Answer all the questions:
5 x 4 = 20
21. a. Implement the Boolean expression
F A B C A BC A B C ABC using a 4 : 1 MUX.
(OR)
b. Design a Full adder using a 3 to 8 line decoder.
22. a. Distinguish between Synchronous and Asynchronous counters.
(OR)
b. Sketch the circuit diagram of a asynchronous decade counter.
23. a. Sketch the block diagram of Melay model. How does it vary from Moore model?
(OR)
b. Briefly explain the synchronous sequential circuit analysis procedure.
24. a. Define a static hazard. What are static 1 and static 0 hazard? Explain.
(OR)
b. Write a short note on dynamic and essential hazards.
25.a.
What is (i) Adaptive testing
(ii) Path sensitization
(OR)
b. How will you detect faults in AND / OR circuits? Explain.
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26. a. Design a 4 bit priority encoder.
b. Design a Binary to BCD converter.
27. Design a MOD-10 synchronous counter using JK Flip flops. Draw the timing diagram.
28. Design the synchronous sequential circuit for Melay state diagram given below using D Flip Flops.
0/0
00
1/1
1/0
1/0
01
11
0/0
0/0
1/1
10
0/0
29. Discuss the different procedures for the design of hazards free circuits.
30. Discuss the tabulation method of fault diagnosis for two level circuits.
example.
****************
Explain with necessary
7N274A
CLASS: M.SC. ELECTRONICS
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
SUBJECT
III
2006
04PEL344
VLSI DESIGN
SECTION – A
Answer all the questions:
20 x 1 = 20
Choose the Correct Answer:
1. In nMOS fabrication, diffusion is achieved by heating wafer to a ______________ temperature.
a) high
b) low
c) moderate
d) none of the above
2. _____________ process allows separate optimization of n – and p – transistors.
a) twin - tub
b) Berkeley
c) n- well
d) p - well
3. In Silicon technologies, ______________ technology is used for critical high speed parts of the system.
a) CMOS
b) Bi CMOS
c) ECL
d) none of the above

4. The CMOS inverter, k ins o , where factor K is a technology __________ parameter.
D
a) dependent
b) independent
c) not
d) none of the above
5. For MOS layers, poly silicon and ___________ regions interact, so that a transistor is formed, where
they cross one another.
a) n - diffusion
b) thinox
c) p - diffusion
d) metal
6. _________________ is used to convey layer information through the use of a color code.
a) diagrams
b) stick diagrams
c) design
d) none of the above
7. A design style should encourage the concepts of ____________ and generality.
a) regularity
b) diagram
c) effort
d) none of the above
8. Diffusion paths must not cross the ____________ line.
a) geometry
b) drawing
c) demarcating
d) both a and b
9. In general, design rules and layout methodology based on the concept of _________.
a) 
b) 
c) 
d) 
10. Micro electronic technology may be characterized in terms of several inductors (or) ___________.
a) figures
b) figures of merit
c) bandwidth
d) none of the above

11. The gate capacitance per unit area is Co ox where ox is _________ of the gate oxide.
D
a) permitivity
b) resistance
c) summation
d) none of the above
12. The reduction of device geometry currently depends mainly on alignment accuracy and on the
resolution of _________________.
a) availability
b) technology
c) linear
d) photolithographic technology
13. _________________ is an industry standard language used to describe hardware from the abstract to
the concrete level.
a) VHDL
b) VSIC
c) VHSIC
d) all the above
14. All designs are expressed in terms of _____________.
a) entities
b) architecture
c) diagram
d) none of the above
15. A signal assignment is identified by the symbol _________________.
d) < 
a) < =
b) = <
c) > =
16. The architecture contains only one statement called _____________.
a) Region
b) last statement
c) sensitivity list
d) process statement
P.T.O.
/2/
17. ______________ is an automatic method of converting a higher level of abstraction to a lower level of
abstraction.
a) process
b) synthesis
c) architecture
d) entity
18. ________________ description is characterized by a style that specifies all the registers in a design, and
the combinational logic between
a) ETL
b) RL
c) Transistor
d) none of the above
19. _____________ are used to control the output of the optimization and maping process.
a) statements
b) Register
c) Constraints
d) none of the above
20. A standard ___________ simulator can be used to read the RTL VHDL description and verify the
correctness of the design.
a) VHDL
b)ASICC
c) beginning
d) none of the above
SECTION – B
Answer all the questions:
5 x 4 = 20
21. a. What is the action performed by enhancement and depletion mode transistor.
(OR)
b. Compare the CMOS and bipolar technology.
22. a. What is meant by stick diagrams and explain with examples.
(OR)
b. Explain the following:
i) Fringing fields
ii) Interlayer capacitances.
23. a. Discuss the substrate doping and explain how it limits the sacling.
(OR)
b. Explain Two-phase clocking in clocked sequential circuits.
24. a. Discuss the drivers.
(OR)
b. Discuss Signal Assignment versus variable assignment.
25.a.
Give the Register level description?
(OR)
b. Give the RTL simulation.
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26. Explain the nMOS fabrication for VLSI Technology.
27. a. Give the propagation delays for designing a circuit?
b. Explain the cascaded inverters as drivers?
28. Discuss the scaling factor for device parameter.
29. Explain the transport versus inertial delay.
30. Write a coding for 4 – bit counter using complex sequential statements and write a coding for 4 bit
shifter.
****************
7N266A
CLASS: B.SC. ELECTRONICS
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
V
2005
04UEL530
SUBJECT
MICROPROCESSORS AND APPLICATIONS
SECTION – A
Answer all the questions:
10 x 3 = 30
1. Write a short not on ALU.
2. What do you infer from a timing diagram?
3. List out the addressing modes available in 8085 microprocessors instruction set.
4. Explain the instruction DAA shortly.
5. What do you mean by Assembler?
6. Mask the Least Significant Bit (LSB) of the accumulator by writing a program.
7. What do you mean by address space partitioning?
8. What is the purpose of the IC 8253 (PIT)?
9. Write a delay program for 0.5 seconds.
10. Generate a square wave with 50% duty cycle at an outport.
SECTION – B
Answer all the questions:
5 x 14 = 70
11. a. With a neat diagram explain the Architecture of the 8085 microprocessor in detail.
(OR)
b. Explain the memory I / O Read operation, memory & I / O write operation in detail with reference
to legible timing diagrams.
12. a. Explain any ten of the data transfer instructions of 8085 microprocessor in detail.
(OR)
b. Explain both the conditional JMP and RET instructions in detail.
13. a. Write a program to move 10 numbers from one memory block to another memory block.
Note: Your program must contain Algorithm, comment for each instruction.
(OR)
b. Arrange 10 numbers in Ascending order by commanding 8085 microprocessor.
Note: Your program must contain Algorithm and associated comments.
14. a. Give a complete picture regarding 8255 PPI with appropriate diagrams and signal status.
(OR)
b. Explain the interrupt structure of the 8085 microprocessor and through that explanation state the
need for an PIC 8259.
15. a. i) Explain that how will you interface a stepper motor to a microprocessor.
ii) Also attempt to convert your interface into a lift control system for only 2 floors.
(OR)
b. Explain that how will you control traffic using 8085 microprocessor at a 4 Road junction. If
possible incorporate a timer display.
****************
7N267B
CLASS: B.SC. ELECTRONICS
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
V
2005
04UEL531
SUBJECT
PROGRAMMING IN C
SECTION – A
Answer all the questions:
10 x 3 = 30
1. Write the variety of data types available in C.
2. Write about Register Storage class.
3. Differentiate while and Do . . . . . While statements.
4. Write the O/P of the following program.
include < stdio.h >
main ( )
{ int i =5, j=10, k,z = 0, l ;
k = + + i;
l=j++;
z = k + l;
print f (“ % d % d % d”, k, l, z) ;
}
5. What is call-by value and call by reference?
6. List out the string handling functions and their uses.
7. Define structure.
8. Union mark
{
Int regno ;
Int mark 1 ;
Int mark 2 ;
Float average ;
Char class ;
}
How many bytes of memory is allocated for the above UNION.
9. What is a pointer?
10. What are the file reading modes?
P.T.O.
/2/
SECTION – B
Answer all the questions:
5 x 14 = 70
11. a. Discuss about symbolic constants. Give examples.
(OR)
b. Explain about operators in C.
12. a. Explain various types of If – statements with examples and syntax.
(OR)
b. Discuss about the following statements: i) FOR – statement
ii) SWITCH
13. a. Explain Recursion. Write a program to calculate factorial of a given number using Recursion and
without Recursion.
(OR)
b. Describe about Global variables and External variables.
14. a. Write a program to sort a set of 10 numbers both ascending order and descending order.
(OR)
b. Discuss about Arrays of structures and structure within structure.
15. a. Discuss about pointers.
(OR)
b. Write a program to read a file named DATA which contains set of numbers and write all odd
numbers to a file to be called ODD and all even numbers to a file to be called EVEN.
****************
7N271B
CLASS: M.SC. ELECTRONICS
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
I
2007
07PEL124
SUBJECT
MICROPROCESSORS AND PROGRAMMING
SECTION – A
Answer all the questions:
20 x 1 = 20
Choose the Correct Answer:
1. 8085 Microprocessor uses _________________ address.
a) 8 – bit
b) 16 - bit
c) 20 - bit
d) 32 - bit
2. MOV B, C is an example of ___________ mode instruction.
a) Register
b) Register Indirect c) Implied
d) Immediate
3. The highest priority interrupt in 8085 is
a) INTR
b) RST 7.5
d) TRAP
c) RST 6.5
4. Bit indicating whether one maskable interrupt capability is enabled or disabled is
a) Mask bit
b) Interrupt enable bit
c) Interrupt pending bit
5. AX, BX, CX and DX are
a) General purpose registers
c) instruction pointer registers
b) pointer and index registers
d) flag registers
6. The length of instruction queue in 8086 is
a) 2 bytes
b) 4 bytes
c) 6 bytes
7. Segment containing instructions of a program is
a) code segment b) data segment
c) extra segment
d) serial input data
d) 8 bytes
d) stack segment
8. Register which points to the location of the next instruction to be located is
a) FR
b) SP
c) BP
d) IP
9. The instruction which prevents coprocessor bus access for the next instruction
a) WAIT
b) HLT
c) LOCK
d) NOP
10. If there is a carry out of the third bit during an addition process ________ will set.
a) Carry flag
b) Auxiliary flag
c) Trap flag
d) overflow flag
11. The instruction CALL will transfer control to a subprogram by saving a return address on
a) Stack
b) Accumulator
c) Pointer
d) Index register
12. Instruction writing the contents of accumulator to a specified port is
a) IN
b) OUT
c) LEA
d) XLAT
13. Intel P6 employs ______________ super pipeline.
a) 4 stage
b) 8 stage
c) 12 stage
d) 14 stage
14. Intel 80386 is capable of directly addressing ____________ of physical memory.
a) 1 MB
b) 16 MB
c) 64 MB
d) 4 GB
15. Unit of p6 processor which commits the temporary values to the permanent state at the right time is
a) Fetch and decode unit
b) Dispatch and execute unit
c) Retire unit
d) Bus interface unit.
P.T.O.
/2/
State True or False:
16. In 8085 Microprocessor, the PSW consists of five status flags.
17. The parity status is set to 1 if an arithmetic or logic instruction generates an answer with even parity.
18. CLD is operand instruction.
19. The instruction JNO transfers control to the target location if overflow flag is reset.
20. Pentium processor employs a branch target buffer, which is used to improve the performance if it takes
the branch instruction.
SECTION – B
Answer all the questions:
5 x 4 = 20
21. a. Explain the register structure of 8085 processor.
(OR)
b. Explain various arithmetic instructions of 8085 processor.
22. a. Explain the internal architecture of 8086 processor.
(OR)
b. Explain the addressing modes of 8086 processor.
23. a. Explain various logical instructions of 8086 processor.
(OR)
b. Explain the processor control instructions.
24. a. Write an assembly language program to multiply 16 – bit binary numbers to give a 32 – bit result.
(OR)
b. Write an assembly language program to find the largest of N numbers.
25.a.
Explain the architecture Intel 80286 processor.
(OR)
b. Explain the concepts of AMD Athlon.
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26. Explain 8085 interrupt structure.
27. Explain the functions of 8086 processor registers.
28. Explain various data transfer instructions of 8086 processor.
29. Write an assembly language program to check whether a given string is palindrome or not.
30. Explain about Intel P6 processor.
****************
7N263B
CLASS: B.SC. ELECTRONICS
ST. JOSEPH’S COLLEGE (AUTONOMOUS), TIRUCHIRAPPALLI - 620 002
SEMESTER EXAMINATIONS NOVEMBER - 2007
TIME: 3 Hrs.
MAX. MARKS: 100
SEM
SET
PAPER CODE
III
2006
04UEL325
SUBJECT
ELECTRIC CIRCUIT THEORY
SECTION – A
Answer all the questions:
20 x 1 = 20
Choose the Correct Answer:
1. The period of a 50Hz voltage wave is
a) 20 sec
b) 0.2 sec.
c) 20 ms
d) 0.2 ms
2. A 3Ω and 6Ω resistors are connected in parallel and the combination in series with a 8Ω resistor. A
20.V source is connected across this resistor combination. Then voltage across the 8Ω resistor is
a) 16V
b) 4V
c) 6V
d) 8V
3. The relation between power factor (pf), average power (Pav) and apparent power (Papp) is correctly
expressed as
a) pf Papp Pav
b) pf Pav Papp
c) pf Pav Papp d) pf Papp X Pav
4. In order to tune a parallel resonant circuit, to a lower frequency the capacitance must be
a) zero
b) increased
c) decreased
d) kept constant
5. If the lower cut off frequency is 1.8 KHz and upper cut off frequency is 5.8 KHz for a resonant circuit,
the bandwidth is
a) 4 KHz
b) 7.6 KHz
c) 1.8 KHz
d) 5.8 KHz
6. A certain series resonant circuit has a bandwidth of 2000Hz. If the existing coil is replaced by a coil
with a lower Q-value. What happens to the bandwidth?
a) BW increases
b) BW decreases
c) BW becomes zero d) BW remains the same
7. A practical voltage source consists of
a) an ideal voltage source in series with an internal resistance.
b) an ideal voltage source in parallel with an internal resistance.
c) both a and b correct
d) none are correct.
8. The nodal method of circuit analysis is based on
a) KVL and Ohm’s law
b) KCL and Ohm’s law
c) KVL and KCL
d) KCL, KVL and Ohm’s law
9. If a network contains B – branches and N – nodes, then the number of mesh current equations would be
a) B – (N – 1)
b) N – (B – 1)
c) B – N – 1
d) (B + N) – 1
10. Superposition theorem is valid only for
a) linear circuits b) non-linear circuits
c) both a & b
11. Norton’s equivalent circuit consists of a
a) Voltage source in parallel with impedance.
c) Current source in series with impedance.
b) Voltage source in series with impedance.
d) Current source in parallel with impedance.
12. The reciprocity theorem is applicable to
a) linear networks only
c) linear / bilateral networks
d) none of these
b) non-linear networks only
d) none of these networks.
P.T.O.
/2/
13. The time constant of a series RL circuit is
b) L R
a) LR
d) e  R L
c) R L
14. The transient response occurs
a) only in resistive circuits
c) only in capacitive circuits
b) only in inductive circuits
d) both inductive and capacitive circuits.
15. Transient current in a RLC circuit is oscillatory when
a) R 2 L
c) R 2 L
b) R = 0
C
C
d) R 2 L
C
State True or False:
16. The impedance of a RC series circuit is the vector sum of the resistance and capacitive reactance.
17. In a transformer, transfer of energy from primary to secondary takes place through self induction.
18. A tree is a connected sub graph of a network, consisting of all the nodes of the original graph but
excluding closed paths.
19. Any resistance of a star circuit is equal to the sum of all resistances in delta connected circuit divided by
the product of the adjacent resistances in the delta connected circuit.
20.Open circuit reverse voltage gain is denoted by the h – parameter h21.
SECTION – B
Answer all the questions:
5 x 4 = 20
21. a. Calculate the impedance values in the case of pure resistive, pure inductive and pure capacitive
circuits. Draw appropriate waveforms.
(OR)
b. What is a power triangle diagram? Determine the power factor, true power, reactive power and
apparent power for the following circuit.
100Ω
Vs
-j200Ω
~
50V
22. a. With a graphical representation, explain the reactance curves of a parallel resonance circuit.
(OR)
b. Explain the principle and characteristics of an ideal transformer.
23. a. State and explain KVL and KCL.
(OR)
b. Explain the method of super mesh analysis of a network.
P.T.O.
/3/
24. a. Describe star to delta and delta to star transformation techniques.
(OR)
b. State Norton’s theorem. Determine Norton’s equivalent between the output terminals PQ.
j4Ω
3Ω
P
4Ω
~
25LO
-j5Ω
Q
25.a.
What are h-parameters? For a given network Z11 = 3Ω, Z12 = 1Ω, Z21 = 2Ω and Z22 = 1Ω. Find the
admittance matrix and the product of  y and  z.
(OR)
b. For the following circuit, find the current equation when the switch is opened at t = o.
20Ω
50V
20Ω
2H
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26. What is a phasor diagram? What are its uses? With impedance diagrams analyse the functioning of a
series RC and parallel RC circuits.
27. What are tuned circuits? Where do they find application? Derive expressions for the amplification
factor and coefficient of coupling for single and double tuned circuits.
28. i) Describe the source transformation technique.
ii) Determine the equivalent voltage source for the current source shown in the following figure.
A
5A
5Ω
B
iii) Determine the power dissipation in the 4Ω resistor of the circuit shown below, by using mesh
analysis.
6Ω
5Ω
2Ω
3Ω
4Ω
50V
+
10V
29. State reciprocity, compensation and maximum power transfer theorems. Illustrate them with your own
examples.
30. Discuss in detail the sinusoidal response of a RLC circuit with the help of differential equations.
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