Which of the following has the highest thermal conductivity ?
A. Brick
B. Air
C. Water
D. Silver
Chemical Heat Transfer
Circulation pump is located below the evaporator to___________________?
Circulation pump is located below the evaporator to___________________?
A. Avoid cavitation
B. Avoid frequent priming
C. Create more suction head
D. None of these
Economy of an evaporator is influenced by the_____________________?
Economy of an evaporator is influenced by the_____________________?
A. Steam pressure
B. Feed temperature
C. Number of effect
D. Both B. & C.
‘Fouling factor’ used in the design of a multipass shell and tube heat exchanger is a_____________________?
‘Fouling factor’ used in the design of a multipass shell and tube heat exchanger is a_____________________?
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
At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the___________________?
At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the___________________?
A. Buffer zone
B. Turbulent core
C. Both A. and B.
D. Viscous sub-layer
Film boiling occurs at ________________ pressure?
Film boiling occurs at ________________ pressure?
A. Atmospheric
B. Sub-atmospheric
C. Negative
D. Very high
Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?
Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?
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
Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________?
Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________?
A. 1
B. < 1
C. > 1
D. > 5
Double pipe heat exchangers are preferably useful, when____________________?
Double pipe heat exchangers are preferably useful, when____________________?
A. High viscosity liquid is to be cooled
B. Requirement of heat transfer area is low
C. Overall heat transfer co-efficient is very high
D. A corrosive liquid is to be heated
With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer ?
With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer ?
A. Decreases
B. Increases
C. Increases exponentially
D. Remain unaffected