Global Technical Campus, Jaipur
GCT
B.Tech V Sem.
Tutorial sheet
Subject: Dynamics of Machines (5ME1A)
Branch: ME
Q.1. what is the function of a governor? How does it differ from that of a Flywheel?
Q.2. Describe the function of a simple watt governor. What are their limitations?
Q.3. Explain the terms Sensitiveness, Hunting, and Stability relating to Governors.
Q.4. Each arm of a porter governor is 200 mm long and is pivoted on the axis of the governor.
The radii of rotation of the balls at the minimum and maximum speeds are 120mm and
160mm respectively. The mass of sleeve is 24kg and each ball is 4kg. Find the range of
speed of the governor. Also determine the range of speed if the friction at the sleeve is 18N.
Q.5. In a Hartnell governor, the extreme radii of rotation of the balls are 40mm and 60mm, and
the corresponding speeds are 210 and 230 rpm. The mass of each ball is 3kg. The lengths
of the ball and the sleeve arms are equal. Determine the initial compression and the
constant of the central spring.
Q.6. what do you understand by gyroscopic couple? Derive a formula for its magnitude.
Q.7. Explain the effect of gyroscopic couple on the reaction of the four wheels of a vehicle
negotiating a curve.
Q.8. describe the gyroscopic effect on a sea going vessels.
Q.9. The heavy turbine rotor of a sea vessel rotates at 1500 rpm. Clockwise looking from the
stern, its mass being 750 kg. the vessel pitches with an angular velocity of 1 rad/s.
determine the gyroscopic couple transmitted to the hull when is rising, if the radius of
gyration for the rotor is 250 mm. also show in what direction the couple acts on the hull.
Q.10. A four wheel trolley car of total mass 2000 kg running on the rails of 1.6 m gauge, rounds
a curve of 30m radius at 54 km/h. the track is banked at . The wheels have an external
diameter of 0.7 m and each pair with axle has a mass of 200 kg. the radius of gyration for
each pairs is 0.3 m. the height of Centre of gravity of the car above the wheel base is 1 m.
determine, allowing for centrifugal force and gyroscopic couple actions, the pressure on
each rail.
Q.11. State and prove the law of gearing. Show that involute profile satisfies the conditions for
correct gearing
Q.12. Derive an expression for the length of the arc of contact in a pair of meshed spur gears
Q.13.What do you understand by the term ‘interference’ as applied to gears?
Q.14. A pair of gears, having 40 and 20 teeth respectively, are rotating in mesh, the speed of the
smaller being 2000 r.p.m. Determine the velocity of sliding between the gear teeth faces at
the point of engagement, at the pitch point, and at the point of disengagement if the smaller
gear is the driver. Assume that the gear teeth are 20° involute form, addendum length is 5
mm and the module is 5 mm. Also find the angle through which the pinion turns while any
pairs of teeth are in contact.
Q.15. A pair of involute spur gears with 16° pressure angle and pitch of module 6 mm is in
mesh. The number of teeth on pinion is 16 and its rotational speed is 240 r.p.m. When the
gear ratio is 1.75, find in order that the interference is just avoided; 1.the addenda on pinion
and gear wheel; 2.the length of path of contact; and 3. The maximum velocity of sliding of
teeth on either side of the pitch point.
Q.16. Explain briefly the differences between simple, compound, and epicyclic gear trains. What
are the special advantages of epicyclic gear trains?
Q.17.Two parallel shafts are to be connected by spur gearing. The approximate distance
between the shafts is 600 mm. If one shaft runs at 120 r.p.m. and the other at 360 r.p.m.,
find the number of teeth on each wheel, if the module is 8 mm. Also determine the exact
distance apart of the shafts.
Q.18. In a reverted gear train, as shown in Fig.1, two shafts A and B are in the same straight line
and are geared together through an intermediate parallel shaft C. The gears connecting the
shafts A and C have a module of 2 mm and those connecting the shafts and B have a
module of 4.5 mm. The speed of shaft A is to be about but greater than 12 times the speed
of shaft B, and the ratio at each reduction is same. Find suitable number of teeth for gears.
The number of teeth of each gear is to be a minimum but not less than 16. Also find the
exact velocity ratio and the distance of shaft C from A and B.
Fig. 1
Q.19 A compound epicyclic gear is shown diagrammatically in Fig.2. The gears A, D and E are
free to rotate on the axis P. The compound gear B and C rotate together on the axis at the
end of arm F. All the gears have equal pitch. The number of external teeth on the gears A,
B and C are 18, 45 and 21respectively. The gears D and E are annular gears. The gear A
rotates at 100 r.p.m. in the anticlockwise direction and the gear D rotates at 450 r.p.m.
clockwise. Find the speed and direction of the arm and the gear E.
Fig.2
Q.20. An epicyclic train is shown in Fig.3. Internal gear A is keyed to the driving shaft and has
30 teeth. Compound wheel C and D of 20 and 22 teeth respectively are free to rotate on the
pin fixed to the arm P which is rigidly connected to the driven shaft. Internal gear B which
has 32 teeth is fixed. If the driving shaft runs at 60 r.p.m. clockwise, determine the speed of
the driven shaft. What is the direction of rotation of driven shaft with reference to driving
shaft?
Fig.3
Global Technical Campus, Jaipur
GCT
B.Tech V Sem.
Assignment sheet
Subject: Automobile Engineering (5ME6.2A)
Branch: ME
1. Describe the various types of chassis construction with the help of neat
diagrams. What are the various components mounted on a chassis?
2. Write short notes on:
a. Frames
b. Sub frames
c. Materials of frame
d. Defects in frames.
3. Explain the working and construction of a multiplate dry clutch. Where and
why do we use multiplate clutch?
4. Explain the working of a multiplate clutch. Discuss its relative merits and
demerits.
5. Suggest a suitable clutch for an ordinary two wheeler e.g. motorcycle,
scooter etc. and explain its working.
6. Describe the working of a sliding mesh gear box with the help of a neat
sketch.
7. Describe the principle of a torque converter. Discuss its advantages and
disadvantages.
8. What is the necessity of gear box in the automobile when the speed can be
varied by means of accelerator?
9. Describe the working principle of an epicycle gear box with neat sketch.
10.Describe the working of a constant mesh gear box with the help of neat
sketch. Discuss the advantages of a constant mesh gear box over sliding
mesh gear box.
11. Draw the construction of Automobile tower and show its constructional
features and their importance.
12. Explain the worm and worm wheel steering system.
13.Explain the terms:
Steering shaft, Steering gear, Tie rod, Pitman arm.
14. Explain various batteries testing procedure in detail.
15. Explain the working of power steering with neat sketch.
16. Explain the construction of battery with Sketch.
17. What are the basic requirements and component of Ignition system?
18. Explain the principle of operation of lead acid battery.
19. Explain different types of tyres with sketch.
20. List out the requirements and functions of suspension system used in
automobile.
GLOBAL TECHNICAL CAMPUS
GLOBAL COLLEGE OF TECHNOLOGY
SUBJECT: REFRIGERATION & AIR CONDITIONING
Assignment sheet
SESSION :2015-16
BRANCH : MECHANICAL ENGG
SEMESTER : 7th
Q1. What are the limitations of simple vapour compression system? Sketch the T-s and p-h
diagram for the dry vapour compression refrigeration cycle and derive the expression for COP.
Q2.
A vapour compression refrigerator works between the pressure limits of 60 bar and 25
bar. The working fluid is just dry at the end of compression and there is no undercooling
of the liquid before the expansion valve. Determine: 1. C.O.P of the cycle; and 2.
Capacity of the refrigerator if the fluid flow is at the rate of 5kg/min.
Data
Pressure
(bar)
60
20
Saturation
temperature
(k)
295
261
Enthalpy (kj/kg)
Liquid
Vapour
Entropy (kj/kg K)
Liquid
Vapour
151.96
56.32
0.554
0.226
293.29
322.58
1.0332
1.2464
Q3. Sketch the T-s and p-h diagram for the vapour compression refrigeration cycle with
superheat vapour after compression and derive the expression for COP.
Q4. A) A vapour compression refrigerator uses methyl chloride and operates between
temperature limit of -10°c and 45°c. At entry to the compressor, the refrigerant is dry
saturated and after compression it acquires a temperature of 60°c. Determine: C.O.P of
the cycle.
Data
Saturation
Enthalpy (kj/kg)
Entropy (kj/kg K)
temperature (°c)
Liquid
Vapour
Liquid
Vapour
-10
45.4
460.7
0.183
1.637
45
133.0
483.6
0.485
1.587
Q5. What is the difference between a refrigerator and heat pump?
Q6. Describe Boot-strap system with T-s diagram and derive the expression for COP.
Q7. An aircraft refrigeration plant has to handle a cabin load of 30 tonnes. The atmospheric
temperature is 17°c. The atmospheric air is compressed to a pressure of 0.95 bar and
temperature of 30°c due to ram action. This air is then further compressed in a compressor
to 4.75 bar, cooled in a heat exchanger to 67°c, expanded in a turbine to 1 bar pressure and
supplied to the cabin. The air leaves the cabin at a temperature of 27°c.the isentropic
efficiency of both compressor and turbine is 0.9.calculate the mass of air circulated per
minute and the C.O.P . for air cp=1.004 kj/kg K cp/ cv=1.4
Q8. Air is used as refrigerant in a reversed brayton cycle. Draw T-S and P-V diagram for this
cycle and derive the expression for COP in terms of pressure ratio.
Q9. A refrigerator working on Bell-Coleman cycle operates between pressure limits of 1.05 bar
and 8.5 bar. Air is drawn from the cold chamber at 10°c, compressed and then it is cooled
to 30°c before entering the expansion cylinder. The expansion and compression follow the
law pv1.3 =constant. Determine the theoretical C.O.P of the system.
Q10. Describe the merits of air refrigeration system.
Q 11 Describe working of Electrolux Refrigerator
Q 12 Derive psychrometric relations of specific humidity, relative humidity and vapour density
Q 13 Explain chemical, physical and thermal properties of refrigerant.
Q 14 One kg of air at 30oC dry bulb temperature and 50% relative humidity is mixed with 2 kg
of air at 20oC dry bulb temperature and 15oC dew point temperature. Calculate temperature and
specific humidity of the mixture.
Q 15 Write chemical formula of following refrigerant
1. R22
2. R113
3. R12
Q 16 Explain working of Lithium- Bromide refrigeration system
Q 17 Derive suitable relation for adiabatic mixing of two air streams
Q 18 What is desirable properties of an ideal refrigerant
Q 19 In a cooling application, moist air enters a refrigeration coil at 40oC and 60% RH. The
apparatus dew point of coil is 5oC and by pass factor is 0.2. Determine the outlet state of moist
air and cooling capacity of coil in TR
Q 20 Define psychrometric terms.