Related Questions

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
Heat is transferred simultaneously by condition, convection and radiation
A Inside boiler furnaces
B During melting of ice
C Through the surface of the insulted pipe carrying steam
D From refrigerator coils to freezer of a refrigerator
The rate of energy transferred by convection to that by conduction is called
A Stanton number
B Nusselt number
C Biot number
D Peclet number
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
Heat energy is transferred by conduction whenever molecules
A Collide each other
B Means of photons
C Particles replaces there places
D All of the above
The ratio of surface convection resistance to the internal conduction resistance is known as
A Grashoff number
B Biot number
C Stanton number
D Prandtl number
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
A Convection
B Radiation
C Conduction
D Both convection and conduction
With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer
A Decreases
B Increases
C Increases exponentially
D Remains unaffected
Fourier's law of heat conduction gives the heat flow for
A Irregular surfaces
B Nonuniform temperature surfaces
C One dimensional cases only
D Two dimensional cases only
In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate.
A Geometric
B Arithmetic
C Logarithmic
D Either A, B or C

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