Steam Boilers - Interview Questions | Exam2Win

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176. The function of injector used in small steam plants is to

A. create vacuum in furnace

B. create vacuum at turbine exhaust

C. pump feed water

D. dose chemicals in feed water

E. control steam temperature by injecting water.

Explanation:

177. The diameter of internal flue tubes in a Lancashire boiler compared to its shell is

A. one-half

B. one-third

C. one-fourth

D. one-fifth

E. two-fifth.

Explanation:

178. Duplex feed pumps are used in small steam boilers. These operate on the principle of

A. centrifugal pump

B. axial flow pump

C. gear pump

D. ejector pump

E. reciprocating pump.

Explanation:

179. The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is

A. more

B. less

C. same

D. could be more or less depending on other factors

E. none of the above.

Explanation:

180. At very low temperature, the melting and boiling temperatures become equal. This temperature is

A. 373�K

B. 273.16�K

C. 303�K

D. 0�K.

E. 300�K.

Explanation: