Central BOE ( NCP) previous year question and answer
Question 1. Factor of safety is defined as ratio of
A. Ultimate stress to allowable stress
B. Ultimate stress to yield stress
C. Allowable stress to ultimate stress
D. Allowable stress to yield stress
Ans. A
Question 2. Variation of shear stress in a circular shaft subjected to torsion is
A. Parabolic
B. Linear
C. Hyperbolic
D. None of the above
Ans. A
Question 3. The minimum capacity of any closed vessel which generates steam under IBR is
A. 227.5 litres
B. 22.75 litres
C. 22.75 kilolitres
D. 2.275 litres
Ans. B
Question 4. A rise in conductivity of boiler feed water indicates
A. Drop in contamination
B. Greater purity of feed water
C. Rise in contamination of feed water
D. It has got relation with contamination of feed water
Ans. C
Question 5. Deaeration of boiler feed water is referred to as
A. Removal of silica
B. Removal of scales by blowdown
C. Removal of dissolved gases
D. All the above
Ans. C
Question 6. Percentage rise in boiler efficiency for a 20 degree centigrade drop in flue gas temperature in air pre heater is
A. 0.1
B. 0.2
C. 10
D. 1
Ans. 1
Question 7. Modern utility boilers are supported at the top and are of hanging type. It is to
A. Keep vertical
B. Allow free expansion
C. Restrict the expansion
D. None of the above
Ans. B
Question 8. The use of primary air in boilers is for
A. Cooling the boiler and the wall
B. Taking ash to ESP
C. Carrying pulverised coal to furnace
D. All the above
Ans. C
Question 9. Heat addition in boiler economiser is through
A. Latent heat
B. Super heat
C. Sensible heat
D All the above
Ans. C
Question 10. pH value to be maintained in feed water is
A. 8.8 to 9.2
B. < 8.3
C. > 9.5
D. None of the above
Ans. A
Also Read :
Boiler Operation Engineer ( BOE ) Previous Year Multiple Choice Questions With Answer Set -1
Boiler Operation Engineer ( BOE ) Previous Year Multiple Choice Questions With Answer Set -2
Boiler Operation Engineer ( BOE ) Previous Year Multiple Choice Questions With Answer Set -3
Boiler Operation Engineer ( BOE ) Previous Year Multiple Choice Questions With Answer Set -4
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