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Steam Boilers - Interview Questions and Answers

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101. On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by
A. horizontal straight line
B. vertical straight line
C. straight inclined line
D. curved line
E. none of the above.
Explanation:
102. The steam temperature with increase in load in case of a boiler fitted with radiation superheated
A. increases
B. decreases
C. remains unaffected
D. first increases and then decreases
E. unpredictable.
Explanation:
103. Coke is produced by
A. pulverising coal in inert atmosphere
B. heating wood in a limited supply of air at temperatures below 300GC
C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
D. binding the pulverised coal into bricketts
E. enriching carbon in the coal.
Explanation:
104. The coal requirement per kW hour generation in the thermal power plant is of the order of
A. 0.1 to 0.2 kg
B. 0.2 to 0.4 kg
C. 0.6 to 0.8 kg
D. 1.0 to 1.5 kg
E. 1.5 to 2 kg.
Explanation:
105. The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is
A. less
B. more
C. equal
D. may be less or more depending on temperature
E. unpredictable.
Explanation:
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