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

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Heat Transfer
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Finned tube heat exchanger with air inside and steam outside
Shell and tube heat exchanger with air on shell side and steam inside tubes
Finned tube heat exchanger with air outside and steam inside
Shell and tube heat exchanger with air inside tubes and steam on shell side

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Heat Transfer
Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place

From one part of a body to the another part of the same body
Between two bodies not in physical contact with each other
Between two bodies in physical contact with each other
Both B & C

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