A. 1.49
B. 1
C. 4.88
D. None of these
1 BTU/hr.ft.°F is equal to _____________ kcal/hr. m.°C? Read More »
Chemical Heat Transfer A. Black & smooth
B. Black & rough
C. White & smooth
D. White & rough
A _____________ surface has the maximum thermal emissivity out of the following ? Read More »
Chemical Heat Transfer A. The cooling rate will be the same for the two spheres and hence the two spheres will have
equal temperatures at any instant
B. Both the spheres will emit equal amount of radiation per unit time in the beginning
C. Both will absorb equal amount of radiation from the surrounding in the beginning
D. Both B. & C.
A. Brick
B. Air
C. Water
D. Silver
Which of the following has the highest thermal conductivity ? Read More »
Chemical Heat Transfer A. Avoid cavitation
B. Avoid frequent priming
C. Create more suction head
D. None of these
Circulation pump is located below the evaporator to___________________? Read More »
Chemical Heat Transfer A. Steam pressure
B. Feed temperature
C. Number of effect
D. Both B. & C.
Economy of an evaporator is influenced by the_____________________? Read More »
Chemical Heat Transfer A. Non-dimensional factor
B. Factor of safety
C. Conversion factor for individual film heat transfer co-efficient to overall heat transfer coefficient
D. None of these
A. Buffer zone
B. Turbulent core
C. Both A. and B.
D. Viscous sub-layer
A. Atmospheric
B. Sub-atmospheric
C. Negative
D. Very high
Film boiling occurs at ________________ pressure? Read More »
Chemical Heat Transfer A. Thickness of the wall
B. Area of the wall perpendicular to heat flow
C. Material of the wall
D. Temperature difference between the two surfaces of the wall
