Mechanical Engineering - Steam Boilers and Engines

16. 

An economiser is generally placed between

A. last superheater or reheater and air preheater
B. induced draft fan and forced draft fan
C. air preheater and chimney
D. none of the above

Answer: Option A

Explanation:

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17. 

In fire tube boilers

A. water passes through the tubes which are surrounded by flames and hot gases
B. the flames and hot gases pass through the tubes which are surrounded by water
C. forced circulation takes place
D. none of these

Answer: Option B

Explanation:

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18. 

The efficiency of a boiler is defined as

A. ratio of heat actually used in producing steam to the heat liberated in the furnace
B. ratio of the mass of steam produced to the mass of total water supplied in a given time
C. ratio of the heat liberated in the furnace to the heat actually Used in producing steam
D. none of the above

Answer: Option A

Explanation:

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19. 

The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

A. condenser efficiency
B. vacuum efficiency
C. nozzle efficiency
D. boiler efficiency

Answer: Option A

Explanation:

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20. 

A valve installed between the boiler and the feed pump is

A. blow off cock
B. feed check valve
C. steam stop valve
D. none of these

Answer: Option B

Explanation:

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