Boiler Operation Engineer Previous year Questions With Answer Set - 29
1.Main objective of a boiler trial is?
a. To determine the generating capacity of the boiler
b. To determine the thermal efficiency of the boiler, when working at a definite pressure
c. To prepare heat balance sheet for the boiler
d. All of the above
Ans. d
2.Device used to put off fire in the furnace of the boiler, when the level of water in the boiler falls to an unsafe limit, is ?
a. Safety valve
b. Fusible plug
c. Blow off cock
d. Stop valve
Ans. b
3.The shell of the Cochran boiler is made hemispherical?
a. To provide maximum strength and
b.To withstand high pressure inside space
c. Both (a) and (b)
d. None of these
Ans. c
4.The dryness fraction of steam within a turbine is not allowed to fall below
a. 0.5
b. 0.95
c. 0. 99
d. 0.9
Ans. d
5. With increase in pressure
a. Enthalpy of dry saturated steam increases
b. Enthalpy of dry saturated steam decrease
c. Enthalpy of dry saturated steam remains same
d. Enthalpy of dry saturated steam first increases and then decreases
Ans. b
6. An analysis which includes the steam in the exhaust is called
a. Dry analysis
b. Dry and wet analysis
c. Wet analysis
d. None of the above
Ans. b
7. Bending moment M and torque T is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, then M is equal to
a. T/2
b. T
c. 2T
d. 4T
Ans. a
8. Rankine cycle efficiency of a good steam power plant may be in the range of
a. 35-45%
b. 15-25%
c. 85-95%
d. 70 -80%
Ans. a
9.For forced draught system, the function of chimney is mainly
a. To produce draught to accelerate the combustion of fuel
b. To discharge gases high up in the atmosphere to avoid environmental hazard
c. To reduce the temperature of hot gases discharged
d. None of the above
Ans. b
10. A shaft was initially subjected to a bending moment and then subjected to torsion if the magnitude of bending moment is found to be the same as that of the torque, then the ratio of maximum bending stress to shear stress would be
a. 0.25
b. 0.5
c. 2.0
d. 4.0
Ans. 2.0
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