Steam Boilers - Interview Questions | Exam2Win

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81. Fire tube boilers are limited to a maximum design working pressure of

A. 1 kg/cm

B. 6 kg/cm

C. 17 kg/cm2

D. 100 kg/cm2

E. 250 kg/cm2.

Explanation:

82. Boiler parameters are expressed by

A. tonnes/hr. of steam

B. pressure of steam in kg/cm2

C. temperature of steam in �C

D. all of the above

E. none of the above.

Explanation:

83. A super critical boiler is one that operates above the pressure and temperature of following values

A. 100 kg/cm2 and 540�C

B. 1 kg/cm2 and 100�C

C. 218 kg/cm2 abs and 373�C

D. 218 kg/cm2 abs and 540�C

E. 100 kg/cm2 abs and 373�C

Explanation:

84. Maximum energy loss in a boiler occurs due to

A. unburnt carbon in ash

B. incomplete combustion

C. ash content

D. flue gases

E. radiation losses.

Explanation:

85. The relative heat absorption for successively added equal areas of boiler convection heating surfaces

A. increases

B. decreases

C. remains unaffected

D. first increases and then decreases

E. first decreases and then increases.

Explanation: