Planck’s distribution law is valid for _____________ bodies?
Planck’s distribution law is valid for _____________ bodies?
A. Black
B. White
C. Coloured
D. All A., B. & C.
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Film boiling occurs at ________________ pressure?
Film boiling occurs at ________________ pressure?A. Atmospheric
B. Sub-atmospheric
C. Negative
D. Very highOverall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?
Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?A. 50 -100 Kcal/hr.m2.°C
B. 50 -100 W/m2.°K
C. 50 -100 BTU/hr. ft.2°F
D. 1000 – 1500 BTU/hr. ft.2°FThe outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid_________________?
The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid_________________?A. Its evaporation loss
B. Excessive corrosion
C. Uneconomic LMTD
D. Decrease in heat exchanger efficiencyThe interchange factor for radiation heat transfer from surface ‘x’ to surface ‘y’ in case of an infinite parallel planes with emissivities εx & εy is given by_______________?
The interchange factor for radiation heat transfer from surface ‘x’ to surface ‘y’ in case of an infinite parallel planes with emissivities εx & εy is given by_______________?A. εx + εy
B. εx . εy
C. 1/εx + 1/εy
D. (εx + εy)/( εx + εy – εx . εy)Correction is applied to LMTD for __________ flow?
Correction is applied to LMTD for __________ flow?A. Parallel
B. Counter
C. Cross
D. None of theseBoiling point elevation of an ideal solution_______________?
Boiling point elevation of an ideal solution_______________?A. Increases rapidly with temperature rise
B. Decreases rapidly with temperature rise
C. In independent of pressure
D. Both B. and C.