Question 21 : Blow off cock in a boiler is used to
1. empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
2. control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
3. put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
4. increase the temperature of saturated steam without raising its pressure
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Question 22 : The main object of a boiler trial is
1. to determine the generating capacity of the boiler
2. to determine the thermal efficiency of the boiler when working at a definite pressure
3. all of the above
4. to prepare heat balance sheet for the boiler
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Question 23 : The artificial draught is produced by
1. centrifugal fan
2. steam jet
3. both steam jet and centrifugal fan
4. chimney
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Question 24 : The cylinder condensation or missing quantity may be reduced by
1. superheating the steam supplied to the engine cylinder
2. the efficient steam jacketing of the cylinder walls
3. all of the above
4. keeping the expansion ratio small in each cylinder
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Question 25 : The actual vacuum in a condenser is equal to
1. barometric pressure + actual pressure
2. barometric pressure - actual pressure
3. gauge pressure + atmospheric pressure
4. gauge pressure - atmospheric pressure
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Question 26 : The selection of type and size of a steam boiler depends upon
1. all of the above
2. the fuel and water available
3. the power required and working pressure
4. the geographical position of the power house
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Question 27 : In a Tandem type compound engine, the high pressure and low pressure cylinders
1. are set at 90°
2. have common piston rod
3. are set in V - arrangement
4. have separate piston rods
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Question 28 : Lancashire boiler is used where working pressure and power required are
1. low
2. high
3. moderate
4. none of these
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Question 29 : The high steam and low water safety valve is used to blow off steam when the
1. water level in the boiler becomes too low
2. both of these
3. steam pressure exceeds the working pressure
4. None of these
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Question 30 : The high pressure and low pressure cylinders in a receiver type compound engine are regarded as having cranks
1. 90° to each other
2. 180° to each other
3. none of these
4. 0° to each other
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