Heat Transfer For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would Decrease Increase First increase and then decrease First decrease and then increase Decrease Increase First increase and then decrease First decrease and then increase ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the co-efficient of performance as a heat pump (COP)HP are (COP)R = (COP)HP = 2.5 (COP)R = (COP)HP = 0.6 (COP)R = 1.5; (COP)HP = 2.5 (COP)R = 2.5; (COP)HP = 1.5 (COP)R = (COP)HP = 2.5 (COP)R = (COP)HP = 0.6 (COP)R = 1.5; (COP)HP = 2.5 (COP)R = 2.5; (COP)HP = 1.5 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the Sum of all resistances Maximum resistance in the series Minimum resistance presents in the series Average of all resistances Sum of all resistances Maximum resistance in the series Minimum resistance presents in the series Average of all resistances ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is None of these Zero Same as average heat transfer co-efficient for tube side Infinity None of these Zero Same as average heat transfer co-efficient for tube side Infinity 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 not in physical contact with each other Between two bodies in physical contact with each other Both B & C 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 From one part of a body to the another part of the same body ANSWER DOWNLOAD EXAMIANS APP
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