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 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 rate of energy transferred by convection to that by conduction is called
A Stanton number
B Nusselt number
C Biot number
D Peclet number
Heat transfer by conduction occurs when molecules
A Collide
B Combine
C Heated
D None of the above
BCD numbers are useful whenever _____ information is transferred into or out of a digital system.
A decimal
B binary
C ASCII
D hexadecimal
E None of the above
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
In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is
A Linear
B Hyperbolic
C Parabolic
D None of these
Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is
A [

A. Thin walled having the value of Ao Ai/

B. Thick walled

B Having the value of Ao/Ai > 2
C Both B and C

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