Question 51 : When steam after doing work in the cylinder passes into a condenser, the engine is said to be a
1. non-condensing steam engine
2. condensing steam engine
3. vertical steam engine
4. slow speed engine
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Question 52 : The relative efficiency is defined as the
1. ratio of brake power to the indicated power
2. ratio of thermal efficiency to Rankine efficiency
3. product of thermal efficiency and Rankine efficiency
4. ratio of heat equivalent to indicated power to the energy supplied in steam
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Question 53 : The draught produced by a steam jet issuing from a nozzle placed in the chimney is called
1. chimney draught
2. forced steam jet draught
3. none of these
4. induced steam jet draught
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Question 54 : Which of the following is a water tube boiler ?
1. Cochran boiler
2. Locomotive boiler
3. Babcock and Wilcox boiler
4. Lancashire boiler
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Question 55 : The actual power supplied by the engine crankshaft is called
1. brake power
2. none of these
3. indicated power
4. frictional power
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Question 56 : The number of fire tubes in a Cochran boiler are
1. 165
2. 225
3. 75
4. 175
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Question 57 : The chimney draught varies with
1. all of these
2. climatic conditions
3. temperature of furnace gases
4. height of chimney
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Question 58 : The diagram factor is the ratio of the
1. actual workdone per stroke to the theoretical workdone per stroke
2. area of the actual indicator diagram to the area of theoretical indicator diagram
3. any one of the above
4. actual mean effective pressure to the theoretical mean effective pressure
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Question 59 : Cut-off ratio is the ratio of
1. volume at cut-off to the clearance volume
2. swept volume to the volume at cut-off
3. volume at cut-off to the swept volume
4. clearance volume to the volume at cut-off
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Question 60 : A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is knwon as
1. superheater
2. air preheater
3. economiser
4. injector
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