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

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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%

48) A safety valve mainly used with locomotive and marine boilers is

lever safety valve

dead weight safety valve

high steam and low water safety valve

spring loaded safety valve

Answer is:

spring loaded safety valve

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