Exercise: Steam Boilers And Engines

Questions for: Steam Boilers And Engines

In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be
A:
56%
B:
63%
C:
74%
D:
78%
Answer: B
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Cut-off governing of steam engines is a method of controlling the engine output by varying
A:
volume of intake steam
B:
pressure of intake steam
C:
temperature of intake steam
D:
all of these
Answer: A
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In natural circulation steam boilers, the circulation of water is by convection currents which are set up during the heating of water.
A:
Correct
B:
Incorrect
C:
D:
Answer: A
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The rate of steam produced in Benson boiler is
A:
100 tonnes/h
B:
135 tonnes/h
C:
175 tonnes/h
D:
250 tonnes/h
Answer: B
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The function of a flywheel is
A:
to convert reciprocating motion of the piston into rotary motion.
B:
to convert rotary motion of the crankshaft into to and fro motion of the valve rod
C:
to prevent fluctuation of speed
D:
to keep the engine speed uniform at all load conditions
Answer: C
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