Prandtl number for most of dry gases is about________________?
Prandtl number for most of dry gases is about________________?
A. 0.001
B. 0.72
C. 70
D. 150
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Absorptivity and reflectivity of a perfect black body are respectively _______________?
Absorptivity and reflectivity of a perfect black body are respectively _______________?A. 1 and 0
B. 0 and 1
C. 1 and ∞
D. 0 and 0.5Heat transfer by ____________ may not necessarily require the presence of a medium?
Heat transfer by ____________ may not necessarily require the presence of a medium?A. Conduction
B. Natural convection
C. Forced convection
D. RadiationSteam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is_____________?
Steam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is_____________?A. Vertical heat exchanger with steam on tube side
B. Vertical heat exchanger with steam on shell side
C. Horizontal heat exchanger with steam on tube side
D. Horizontal heat exchanger with steam on shell sideWhich of the following has the minimum thermal conductivity ?
Which of the following has the minimum thermal conductivity ?A. Nitrogen
B. Steel
C. Carbon black
D. TarThe characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are_______________?
The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are_______________?A. Re.Gz
B. Nu, Pr
C. Nu, Pr, Re
D. Nu, GzThe ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is ________________?
The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is ________________?A. 2
B. 1/2
C. 4
D. 1/4