Steam Boilers - Interview Questions | Exam2Win

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26. The function of injector used in small capacity boilers is to

A. create vacuum

B. inject chemical solution in feed pump

C. pump water, similar to boiler feed pump

D. add make up water in the system

E. none of the above.

Explanation:

27. An economizer in a boiler

A. increases steam pressure

B. increases steam flow

C. decreases fuel consumption

D. decreases steam pressure

E. increases life of boiler.

Explanation:

28. The economiser is used in boilers to

A. increase thermal efficiency of boiler

B. economise on fuel

C. extract heat from the exhaust flue gases

D. increase flue gas temperature

E. to heat feed water by bled steam.

Explanation:

29. In regenerative air preheater, the heat is transferred

A. from a metal wall from one medium to another

B. from heating an intermediateanaterial and then heating the air from this material

C. by direct mixing

D. heat is transferred by bleeding some gas from furnace

E. none of the above.

Explanation:

30. The pressure of reheat steam after passing through reheated compared to inlet condition is

A. more

B. less

C. equal

D. may be more or less depending on capacity of reheated

E. none of the above.

Explanation: