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WorksheetsPharmaceutical Engeneering
Total questions: 20
Worksheet time: 3600secs
The literature of heat transfer generally recognizes distinct modes of heat transfer. How many modes are there?
1
2
3
4
Heat transfer takes place according to
First Law of Thermodynamics
Fourth Law of Thermodynamics
Second Law of Thermodynamics
Third Law of Thermodynamics
When heat is transferred from one particle of hot body to another by actual motion of heated particles,it is referred to as heat transfer by
Conduction
Convection
Radiation
When heat is transferred from hot body to cold body,in a straight line, without effecting the intervening medium,It is reffer as a heat transfer by
Conduction
Convection
Radiation
When heat is transferred by molecular collision,it is referred to as heat transfer
Conduction
Convection
Radiation
Heat transfer liquid and gases take place by
Conduction
Convection
Radiation
Heat is closely related to
Liquids
Energy
Temperature
Heat flows from one body to other body when they have
Different heat contents
Different atomic structure
Different temperatures
None of the above
Which of the following has least value of conductivity
Glass
Water
Air
Rubber
When heat is transferred by molecular collision,it is referred to as heat transfer
Conduction
Convection
Radiation
Heat transfer by radiation mainly depends upon
Its temperature
Nature of the body
Kind and extent of its surface
All of above
Fourier's law of heat conduction is vaild for
One dimensional cases only
Two dimensional cases only
Three dimensional cases only
Irregular surfaces
Which of the following is an example of steady state heat transfer?
Boilers and turbine
Cooling of I.C engine
Chilling effect of cold wind on a warm body
Electric bulb cools down by the surrounding atmosphere
Which statement is true regarding steady state condition?
There is a variation in temperature in the course of time
Heat exchange is constant
It is a function of space and time coordinates
Internal energy of the system changes
According to the Fourier's law of heat conduction, the rate of heat transfer by conduction depends upon
area of cross section normal to the heat flow
temperature gradient
both a. and b.
None of above
The value of thermal conductivity k depends upon
the material through which the heat is transferred
the intensity of heat energy which is being transferred
the area which is parallel to the heat transfer
All of above
Units for thermal conductivity
J/kg.K
J/mol.K
J.ohm/sec.K2
W/m.K
Unsteady stateheat transfer is a ______ continuing heat transfer process
Fast
Slow
Fast & slow
True or false statements-------
Heat is transfered via electromagnetical waves.
True
False
What would be the thermal resistance of an ideal conductor?
Zero
One
Infinity
Ten
