Mechanical Engineering - Steam Boilers and Engines

21. 

The relative efficiency is defined as the

A. ratio of thermal efficiency to Rankine efficiency
B. ratio of brake power to the indicated power
C. ratio of heat equivalent to indicated power to the energy supplied in steam
D. product of thermal efficiency and Rankine efficiency

Answer: Option A

Explanation:

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22. 

Benson boiler is a __________ water tube steam boiler using forced circulation of water.

A. low pressure
B. high pressure

Answer: Option B

Explanation:

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23. 

Lancashire boiler has __________ internal flue tubes.

A. one
B. two
C. three
D. four

Answer: Option B

Explanation:

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24. 

Locomotive boiler is a __________ boiler.

A. fire tube
B. water tube

Answer: Option A

Explanation:

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25. 

When steam after doing work in the cylinder passes into a condenser, the engine is said to be a

A. slow speed engine
B. vertical steam engine
C. condensing steam engine
D. non-condensing steam engine

Answer: Option C

Explanation:

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