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Steam Boilers - Interview Questions and Answers

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106. The critical pressure at which latent heat of vaporization is zero is
A. 225.65 kgf/cm2
B. 273 kgf/cm2
C. 100 kgf/cm2
D. 1 kgf/cm2
E. - 1 kgf/cm2.
Explanation:
107. If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to
A. Ps-Pa
B. pa-ps
C. Pa+P,
D. ps+pa
E. none
Explanation:
108. At which pressure the properties of water and steam become identical
A. 0.1 kg/cm2
B. 1 kg/cm2
C. 100 kg/cm2
D. 225.6 kg/cm2
E. it is never possible.
Explanation:
109. The latent heat of steam with increase of pressure
A. remains same
B. increases
C. decreases
D. behaves unpredictably
E. none of the above.
Explanation:
110. The dry saturated steam at very high pressure (150-200 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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