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Heat Transfer

Heat Transfer
Conductance is given by(where, x = thickness, A = heat flow area, K = thermal conductivity.)

K/Ax
KA/x
A/Kx
X/KA

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Heat Transfer
Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.

the least
lower
the largest
no

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Heat Transfer
At constant temperature, the thermal conductivities of gases __________ with rise in pressure.

Remain unchanged
May increase or decrease; depends on the pressure
Increase
Decrease

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Heat Transfer
Kg of liquid evaporated per hour in an evaporator is defined as its

Steam load
None of these
Economy
Capacity

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Heat Transfer
Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

32
37
50
45

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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.

Linear
Hyperbolic
Logarithmic
Parabolic

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