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Heat Transfer

Heat Transfer
Heat flux, as defined in heat flow is analogous to __________ in electricity flow.

None of these
Voltage
Resistance
Current

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Heat Transfer
Film boiling is usually not desired in commercial equipments, because

it is difficult to maintain
the heat transfer rate is low in view of the large temperature drop. @
none of the listed here
it is not economic

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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

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

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Heat Transfer
Steam traps are provided in steam carrying pipelines to

remove condensate and inert gases
condense steam
release excess steam pressure by bleeding steam.
none of the listed here

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Heat Transfer
A 2-4 heat exchanger involves

Smaller pressure drop compared to 1-2 exchanger
Only parallel-flow of fluids
Both counter and parallel-flow of the fluids
Only counter-flow of fluids

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

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

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