Heat Transfer
In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will

Either increase or decrease; depends on the coolant flow rate
Remain unchanged
Increase
Decrease

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the

Average temperature of the fin
Constant temperature equal to that of the base
Temperature of the fin end
Surrounding temperature

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

None of these
By direct contact of hot flue gas with air
By heating an intermediate material (like chequor bricks) and then heating the air from this hot material
Through a metallic wall

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Heat Transfer