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Heat Transfer

Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

1.49
4.88
1
None of these

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Heat Transfer
In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

Less than 45°C
Initially decreases and remains constant thereafter
Equal to 45°C
More than 45°C

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Heat Transfer
With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer

Increases
Increases exponentially
Decreases
Remains unaffected

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Heat Transfer
Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger?

All of these
Tube side pressure drop and the heat transfer rate
Effective tube surface area for convective heat transfer
Convective heat transfer co-efficient

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

None of these
Capacity
Economy
Steam load

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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 tempeature follows __________ law.

Linear
Parabolic
Hyperbolic
Logarithmic

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