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Heat Transfer

Heat Transfer
__________ heat exchanger is used for chilling oil to be dewaxed.

Fixed tube
U-tube
Double pipe
Floating head

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Heat Transfer
In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms⁻². Neglecting the heat capacity of agitator, the temperature of water (in °C) is

34.4
40.5
26.8
25

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Heat Transfer
With increase in temperature, the thermal conductivity of steel

Decreases
Remains unchanged
Increases exponentially
Increases

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Heat Transfer
An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

9000
4000
3000
4600

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Heat Transfer
Heat produced when a steady state current, I passes through an electrical conductor having resistance, 'R' is

IR2
I2R
IR
None of the listed here

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Heat Transfer
In a multiple effect evaporator, the effect of boiling point elevation is to

reduce the economy
all of the listed here
increase the economy
reduce the capacity

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