Question 71 : A safety valve usually employed with stationary boilers is
1. high steam and low water safety valve
2. dead weight safety valve
3. lever safety valve
4. all of the mentioned
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Question 72 : What is the purpose of using economizer in the boiler?
1. to heat feed water by utilizing heat from exhaust gases
2. to heat feed water by utilizing some heat from superheated steam
3. to superheat steam
4. none of the mentioned
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Question 73 : The formation of scale boiler leads to
1. decrease in efficiency of boiler
2. increase in efficiency of boiler
3. increase in heat transfer
4. decrease in maintenance of boiler
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Question 74 : The function of a safety valve is
1. to indicate the water level inside the boiler to an observer
2. to measure pressure of steam inside the steam boiler
3. to blow off steam when the pressure of steam inside the boiler exceeds the working pressure
4. none of the mentioned
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Question 75 : Which of the following statement is wrong ?
1. Water tube boilers are internally fired.
2. Locomotive boiler is a water tube boiler.
3. La-mont boiler is a low pressure water tube boiler.
4. all of the mentioned
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Question 76 : The high pressure and low pressure cylinders in a receiver type compound engine are regarded as having cranks
1. 180° to each other
2. 90° to each other
3. 0° to each other
4. none of the mentioned
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Question 77 : The equivalent evaporation is defined as?
1. the ratio of heat actually used in producing the steam to the heat liberated in the furnace
2. the amount of water evaporated or steam produced in kg of fuel burnt
3. the amount of water evaporated from and at 100 degree C into dry & saturated steam
4. none of the mentioned
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Question 78 : The high steam and low water safety valve is used to blow off steam when the
1. steam pressure exceeds the working pressure
2. water level in the boiler becomes too low
3. none of the mentioned
4. both of the mentioned
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Question 79 : A closed vessel made of steel & used for the generation of steam is called a
1. steam condenser
2. steam boiler
3. steam injector
4. steam turbine
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Question 80 : The power of a boiler may be defined as
1. the amount of water evaporated or steam produced in kg per kg of fuel burnt
2. the ratio of heat actually used in producing the steam to the heat liberated in the furnace
3. the evaporation of 15.653 kg of water per hour from and at 100° C
4. the amount of water evaporated from and at 100° C into dry and saturated steam
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