Related Questions

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 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
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
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 at which energy is transferred is called
A Power
B Watt
C Volt
D Potential
With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________ , if the conduction and radiation through the solid are negligible.
A Increases
B Decreases
C Remains same
D Increases linearly
The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as
A $${\left( {\Delta {\text{T}}} \right)^{\frac{1}{4}}}$$
B $${\left( {\Delta {\text{T}}} \right)^{\frac{1}{2}}}$$
C $${\left( {\Delta {\text{T}}} \right)^{\frac{5}{4}}}$$
D $${\left( {\Delta {\text{T}}} \right)^{\frac{3}{4}}}$$
The forbidden energy gap between the valence band and conduction band will be least in case of
A Metals
B Semiconductors
C Insulators
D All of the above
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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