Related Questions

Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids?
A Dittus-Boeltier equation
B Sieder-Tate equation
C Nusselt equation
D None of these
In forced convection, the heat transfer depends on
A Re, Pr
B Re, Gr
C Mainly Gr
D Re only
Nusselt number (for forced convection heat transfer) is a function of the __________ number.
A Prandtl
B Reynolds
C Both A & B
D Neither A nor B
In forced convection, the Nusselt number is a function of
A Re and Pr
B Re and Gr
C Pr and Gr
D Re and Sc
Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?
A Long vertical evaporator
B Horizontal tube evaporator
C Agitated film evaporator
D Calenderia vertical tube evaporator
Which best describes how air moves during convection?
A cool air falls down
B warm air falls down
C cool air is replaced by warm air
D air always falls down
When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as
A Internally fired boiler
B Externally fired boiler
C Natural circulation boiler
D Forced circulation boiler
The heat is transferred by conduction, convection and radiation in
A Melting of ice
B Boiler furnaces
C Condensation of steam in condenser
D None of these
Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in
A Electric heater
B Steam condenser
C Boiler
D Refrigerator condenser coils
The natural convection air cooled condensers are used in
A Domestic refrigerators
B Water coolers
C Room air conditioners
D All of these

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