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Posted Date: 14 Jul 2009 Posted By: satish Member Level: Diamond
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2009 Jawaharlal Nehru Technological University, Hyderabad B.Tech Electronic Instrumentation & Control Engineering Code No: 3222206 ,Jntu II B. Tech II Semester Regular Examinations, April/May 2009 , PRIME MOVERS AND MECHANICAL COMPONENTS Question paper
Code No: 3222206
II B. Tech II Semester Regular Examinations, April/May 2009
PRIME MOVERS AND MECHANICAL COMPONENTS
( Instrumentation & Control Engineering )
Time: 3 hours Max Marks: 80
Answer Any FIVE Questions
All Questions carry equal marks
1. a) Define the terms i)Impact of jets and ii) Jet propulsion
b) A pelton wheel is to be designed for a head of 60M when running at 200rpm . The
pelton wheel develops 95.6475KW shaft power.The velocity of buckets=0.45 times of
jets,overall efficiency is 85% and Cv=0.98 [6+10]
2. a) Define slip, percentage slip and negative slip of reciprocating pump.
b) Why is it that the speed of a reciprocating pump with out air vessels is not high?
Explain with sketches. [6+10]
3. a) With a neat sketch explain the working of a centrifugal pump.
b)A Centrifugal pump with 1.2 m diameter runs at 200rpm and pumps 1880 liters/sec,
the average lift being 6 m .The angle which the vanes make at exit with the tangent to the
impeller is 26o and the radial velocity of flow is 2.5 m/s .Determine the monometric
efficiency and the least speed to start pumping against a head of 6 m, the inner diameter
of the impeller being 0.6 m [8+8]
4. a) How are boilers classified? Give comparision between “Fire-tube and water-tube”
boilers.
b) Explain with a neat sketch the working of Babcock and Wilcox boiler [8+8]
5. a) Describe with a neat sketch water level indicator for a boiler
b) Explain the function of the super heater? Describe sugden super heater [8+8]
6. a) Explain the difference between impulse turbine and reaction turbine.
b) The following data relate to a simple stage impulse turbine.
Steam velocity=600m/s; Blade speed = 250 m/s; Nozzle angle =20o; Blade outlet
angle=25o .Neglecting the effect of friction calculate the work developed by the turbine
for the steam flow rate of 20 kg/sec. Also calculate axial thrust on the bearings
7. a) Describe with a neat sketch the working of a simple constant pressure open cycle gas
turbine
b) List the methods of improving the efficiency and specific output of a simple gas
turbine [8+8]
8. a) Write short notes on the following
i) Blow-offcock ii) Steam separator iii) Kinematic chains iv) Change mechanism
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