Heat Transfer MCQs | Heat Transfer Multiple Choice Questions and Answers

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Questions
1 Unit of thermal conductivity in M.K.S. units is
A kcal/kg m2 °C
B kcal-m/hr m2 °C
C kcal/hr m2 °C
D kcal-m/hr °C

Answer: kcal-m/hr m2 °C
2 Thermal conductivity of solid metals with rise in temperature normally
A Increases
B Decreases
C Remains Constant
D May Increase Or Decrease Depending On Temperature

Answer: Decreases
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3 When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by
A Conduction
B Convection
C Radiation
D Conduction And Convection

Answer: Conduction
4 When heat is Transferred by molecular collision, it is referred to as heat transfer by
A Conduction
B Convection
C Radiation
D Scattering

Answer: Convection
5 Pick up the wrong case. Heat flowing from one side to other depends directly on
A Face Area
B Time
C Thickness
D Temperature Difference

Answer: Thickness
6 Which of the following is a case of steady state heat transfer
A I.C. Engine
B Air Preheaters
C Heating Of Building In Winter
D None Of The Above

Answer: Ciliated Epithelium
7 Cork is a good insulator because it has
A Free Electrons
B Atoms Colliding Frequency
C Low Density
D Porous Body

Answer: Histamine
8 Thermal conductivity of water at 20°C is of the order of
A 0.1
B 0.23
C 0.42
D 0.51

Answer: 0.51
9 Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of
A 0.002
B 0.02
C 0.01
D 0.1

Answer: 0.02
10 Heat flows from one body to other when they have
A Different Heat Contents
B Different Specific Heat
C Different Atomic Structure
D Different Temperatures

Answer: Different Temperatures
11 The amount of heat flow through a body by conduction is
A directly proportional to the surface area of the body
B directly proportional to the temperature difference on the two faces of the body
C dependent upon the material of the body
D all of the above

Answer: all of the above
12 Which of the following has least value of conductivity
A Glass
B Water
C Plastic
D Air

Answer: Air
13 Which of the following is expected to have highest thermal conductivity
A Steam
B Solid Ice
C Melting Ice
D Water

Answer: Solid Ice
14 Which of the following has maximum value of thermal conductivity
A Aluminium
B Steel
C Brass
D Copper

Answer: Aluminium
15 Heat is transferred by all three modes of transfer, viz, conduction, convection and radiation in
A Electric Heater
B Steam Condenser
C Melting Of Ice
D Boiler

Answer: Boiler
16 Heat transfer by radiation mainly depends upon
A Its Temperature
B Nature Of The Body
C Kind And Extent Of Its Surface
D All Of The Above

Answer: All Of The Above
17 Unit of thermal diffusivity is
A m2/hr
B m2/hr°C
C kcal/m2 hr
D kcal/m.hr°C

Answer: m2/hr
18 Film coefficient is defined as Inside diameter of tube
A Equivalent thickness of film
B Thermal conductivity Equivalent thickness of film Specific heat x Viscocity
C Film coefficient x Inside diameter Thermalconductivity
D none of the above

Answer: Thermal conductivity Equivalent thickness of film Specific heat x Viscocity
19 The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as
A Emissivity
B Transmissivity
C Reflectivity
D Intensity Of Radiation

Answer: Intensity Of Radiation
20 Emissivity of a white polished body in comparison to a black body is
A higher
B Lower
C Same
D Depends Upon The Shape Of Body

Answer: Lower

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