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March 2019

In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?

Chemical Heat Transfer /
In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?

A. Varies directly as the area and the LMTD
B. Directly proportional to LMTD and inversely proportional to the area
C. Varies as square of the area
D. None of these

In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________? Read More »

Chemical Heat Transfer

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows _____________ law?

Chemical Heat Transfer /
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows _____________ law?

A. Parabolic
B. Hyperbolic
C. Linear
D. Logarithmic

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows _____________ law? Read More »

Chemical Heat Transfer

Which of the following is the most widely used heat insulating material for pipelines carrying steam ?

Chemical Heat Transfer /
Which of the following is the most widely used heat insulating material for pipelines carrying steam ?

A. Tar dolomite bricks followed by asbestos
B. Fireclay refractory followed by aluminium sheet
C. Cotton followed by aluminium foil
D. 85% magnesia cement and glass wool

Which of the following is the most widely used heat insulating material for pipelines carrying steam ? Read More »

Chemical Heat Transfer

In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is _____________ the outlet temperature of the cold fluid?

Chemical Heat Transfer /
In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is _____________ the outlet temperature of the cold fluid?

A. Equal to
B. More than
C. Less than
D. Either more or less than (depending upon the fluid)

In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is _____________ the outlet temperature of the cold fluid? Read More »

Chemical Heat Transfer