Question 61 : 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 known as
1. air preheater
2. superheater
3. injector
4. none of the mentioned
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Question 62 : Cut-off ratio is the ratio of?
1. cut-off volume to clearance volume
2. clearance volume to cut-off volume
3. volume at cut-off to swept volume
4. swept volume to volume at cut-off
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Question 63 : The diagram factor is the ratio of?
1. area of actual indicator diagram to the area of theoretical indicator diagram
2. actual work done per stroke to the theoretical work done per stroke
3. actual mean effective pressure to the theoretical mean effective pressure
4. any of the above mentioned
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Question 64 : How can we classify steam generators on the basis of application
1. utility steam generators
2. industrial steam generator
3. marine steam generator
4. all of the mentioned
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Question 65 : What is the critical pressure of steam?
1. 221.2 bar
2. 220 bar
3. 120 bar
4. 300 bar
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Question 66 : Which device used to separate condensate from the steam without letting steam escape?
1. condenser
2. steam valve
3. steam trap
4. none of the above
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Question 67 : Which of the following statement is correct for a compound steam engine?
1. The forces in the working parts are increased as the forces are distributed over more parts
2. The cost of the engine, for the same power and economy, is more than that of a simple steam engine
3. The temperature range per cylinder is increased, with corresponding increase in condensation
4. The ratio of expansion is reduced, thus reducing the length of stroke
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Question 68 : When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as
1. forced circulation boiler
2. externally fired boiler
3. naturally circulation boiler
4. internally fired boiler
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Question 69 : Industrial steam generators operate in a pressure range of?
1. 5-105 bar
2. 6-106 bar
3. <5 bar
4. >105 bar
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Question 70 : The boiler in which the tubes are surrounded by hot gases is called as
1. fire tube boiler
2. water tube boiler
3. both a. and b
4. none of the mentioned
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