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Steam Boilers - Interview Questions and Answers

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116. Latent heat of dry steam at atmospneric pressure is equal to
A. 539 kcal/kg
B. 539 BTU/lb
C. 427 kcal/kg
D. 100 kcal/kg
E. 471 kcal/kg.
Explanation:
117. While steam expands in turbines, theoretically the entropy
A. remains constant
B. increases
C. decreases
D. behaves unpredictably
E. none of the above.
Explanation:
118. The pressure at which latent heat of vaporisation of water is zero, is
A. below atmospheric pressure
B. 1 kg/cm2
C. 100 kg/cm2
D. 170 kg/cm2
E. 225.6 kg/cm2.
Explanation:
119. At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporization is
A. maximum
B. minimum
C. zero
D. depends on temperature also
E. none of the above.
Explanation:
120. The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become
A. wet
B. superheated
C. remain dry saturated
D. dry
E. none of the above.
Explanation:
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