43) The function of a flywheel is

to convert reciprocating motion of the piston into rotary motion.

to convert rotary motion of the crankshaft into to and fro motion of the valve rod

to prevent fluctuation of speed

to keep the engine speed uniform at all load conditions

Answer is:

to prevent fluctuation of speed

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44) The rate of steam produced in Benson boiler is

100 tonnes/h

135 tonnes/h

175 tonnes/h

250 tonnes/h

Answer is:

135 tonnes/h

45) In natural circulation steam boilers, the circulation of water is by convection currents which are set up during the heating of water.

Correct

Incorrect

Answer is:

Correct

46) Cut-off governing of steam engines is a method of controlling the engine output by varying

volume of intake steam

pressure of intake steam

temperature of intake steam

all of these

Answer is:

volume of intake steam

Explanation:

The cut-off governing, of a simple steam engine, is a method of controlling the engine output by varying volume of intake steam. This is done by varying the cut-off point by a slide valve under the control of a centrifugal governor.

47) 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

56%

63%

74%

78%

Answer is:

63%

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