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WorksheetsHeat transfer,steady and unsteady state
Total questions: 20
Worksheet time: 10mins
The literature of heat transfer generally recognises distinct modes of heat transfer.How many modes are there?
One
Two
Three
Three
Unit of the rate of heat transfer
Joule
Newton
Pascal
Watt
How many types of convection process are there
One
Two
Three
Four
Thermal conductivity is Max. For which substance
Silver
Iron
Aluminum
Diamond
Which statement is true regarding steady state condition
There is a variation in temp in the course of time
Heat exchanger is constant
It is a function of space and time coordinate
None of these
Which of the following is an example of steady state heat transfer
Boliers and turbines
Electric bulb cools down by the surrounding atmosphere
Both
None of these
Heat transfer take place according to which law
Newton's law of cooling
Second law of thermodynamics
Both of these
None of these
Heat transfer take place in liquid and gases is essentially due to
Radiation
Conduction
Convection
All of these
The heat is transferred by conduction, convection and radiation in
Melting of ice
Boiling furnaces
Condensation of steam in condensor
Non of these
Heat is transferred by all three modes of transfer,viz.conduction, convection and radiation in
Electric heater
Steam condensor
Boiler
Refrigerator condensor coils
Thermal conductivity is defined as the heat flow per unit time
When the temperature gradient is unity
Across unit area where the temperature gradient is unity
Both of these
None of these
Mark the matter with least value of thermal conductivity
Air
Water
Ash
Window glass
Heat conduction in gases is due to
Elastic impact of molecules
Movement of electrons
Both of these
Non of these
The famous Fourier series is named after
Filler and Ryan
J.B Joseph Fourier
Both
Non of these
Fourier law of heat conduction is best represented by
Q=-kAdt/dx
Q=kAdx/dt
Both
None of these
Negative sign in Fourier heat conduction equation indicates
Heat always flow is in the direction of positive temperature gradient
Heat always flows in the direction of negative temperature gradient
Both
None of these
Which one is not the unit of thermal conductivity
Kcal/m he k
Kl/m he k
W/m s k
None of these
Thermal conductivity represents the amount of heated conducted across the unit area when a temperature difference of one kelvin
True
False
Which of the following is the unit of thermal reistance
Degree/Kcal
Hour degree
S degree/k cal
Degree/W
Identify the wrong statement
The process of heat transfer is an irreversible process
Heat flow doesn't depends on temperature
Both
None of these
