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Heat Transfer

Heat Transfer
Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is

100
0.5
10
2

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Heat Transfer
A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m².K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is

55.5
555
0.15
0.55

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Heat Transfer
Heat exchanger tubes are never made of

Plain carbon steel
Lead
Stainless steel
Copper

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Heat Transfer
In SI units, thermal conductivity is expressed in

Watt/m.°K
Watt/m². °K
Watt/m². °K
Watt/m4. °K

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Heat Transfer
Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively)

1/CE
C/E
E/C
CE

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Heat Transfer
Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water.

Boiling point (at the same pressure)
Thermal conductivity
Viscosity
Density

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MORE MCQ ON Heat Transfer

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