Related Questions

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
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.
A Laminar
B Transition
C Both A & B
D Highly turbulent
Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is
A In the central core of the fluid
B Uniformly distributed throughout the fluid
C Mainly confined to a thin film of fluid near the surface
D None of these
Whether credit can be availed without actual receipt of goods where goods are transferred through transfer of document of title before or during the movement of goods?
A Yes
B No
C Yes, in specific instances
D Can be availed only after transfer of document of title after movement of goods
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by
A Conduction
B Convection
C Radiation
D Conduction and convection
When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by
A Conduction
B Convection
C Radiation
D Conduction and convection
When heat is transferred by molecular collision, it is referred to as heat transfer by
A Conduction
B Convection
C Radiation
D Scattering
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
A Increases
B Decreases
C Remains constant
D Passes through a maxima
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

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