Hello, guys today we are learning about topic Mechanical Multiple choice questions of Heat transfer.
this mcq questions is important about exams and other types of competitive exams.
Heat transfer mcq (Objective) questions.
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| Mechanical Multiple choice questions of Heat transfer |
Q.no 1) As the temperature increases the the thermal conductivity of gas
A: Decrease
B: Increase
C: Remains same
D: First increase and then decrease
Answer:- (B)
Q.no.2) The overall heat transfer coefficient used in the problem of
A: Radiation
B: Convection
C: Conduction
D: Combined conduction and convection
Answer:- (D)
Q.no.3) A surface is one for which
A: Emissivity equals transmissivity
B: Reflectivity equals emissivity
C: Absorptivity equals reflectivity
D: Emissivity is constant
Answer:- (D)
Q.no.4) Thermal resistance in thermal circuit is analogous to which parameter in electrical circuit?
A : Electrical resistance
B : Electric current
C : Electric potential difference
D : Electric power
Answer:- (A)
Q.no 5. The two fluids are not mixed and kept separated as they both flow through heat exchanger in
A : Recuperator
B : Regenerator
C : Mixer
D : Evaporator
Answer:- (A)
Q.no 6. Which of the following is NOT a type of condensation heat transfer
process?
A : drop-wise condensation
B : bulk-wise condensation
C : film-wise condensation
D: None
Answer:- (B)
Q.no.7. If the fin is sufficiently thin, so heat flows pertain to
A : One dimensional heat conduction
B : Two dimensional heat conduction
C : Three dimensional heat conduction
D : No heat flow is there
Answer:- (A)
Q.no.8)The selection criteria of thermal insulation does not include,
A : Appearance of insulation material
B : Environment of insulating material to be used
C : High thermal conductivity of insulating material
D : Cost of thermal insulation material
Answer:- (C)
Q.no.9) Mark the system where heat transfer is given by forced convection
A : Chilling effect of cold wind on warm body
B : Fluid passing through the tubes of a condenser and other heat exchange equipment
C : Heat exchange on the outside of cold and warm pipes
D: Heat flow from a hot pavement to surrounding atmosphere
Answer:- (D)
Q.no.10) In natural convection, the Nusselt number depends on
A : Prandtle number and Reynold’s number
B : Grashof number and Reynold’s number
C : Grashof number and Prandtl number
D:Prandtl number and Grashof number
Answer:- (C)
Q.no 11). According to the Fourier's law of heat conduction, the rate of heat
transfer by conduction depends upon
A : Surface area of exposed to the heat flow
B : Area of cross section normal to the heat flow
C : Both surface area as well as area of cross section to heat flow
D : It is not depend on area
Answer:- (B)
Q.no.12) A radiation shield should have
A : high absorptivity
B : high reflectivity
C : high emissivity
D : high emissive power
Answer:- (B)
Q.no 13) For a given value of Nusselt number, the convective surface coefficient h is directly proportional to
A : Length
B : Mass
C : Density
D :Thermal conductivity
Answer:- (D)
Q.no.14) Thermal conductivity of solid metals with rise in temperature normally
A : Decreases
B : Increases
C : Remain constant
D : May increase or decrease depending on temperature
Answer:- (A)
Q.no.15) Heat capacity is defined as the product of
A : Mass and specific heat
B : Time and temperature
C : Specific heat and temperature
D : Mass and temperature
Answer:-(A)
Q.no. 16) Which of the following statements about
insulators is true?
A :They have high thermal conductivity
B ;They impede the flow of heat
C :They are usually metallic in nature
D : They are good conductors of electricity
Answer:-(B)
Q.no. 17) The process of heat transfer pass through the movement of a fluid such air, water is known
a) Conduction
b) Convection
c) Radiation
d) Both (A) and (B)
Answer: (A)
Q.no 18) The process by which heat energy is
transferred in the form of electromagnetic waves is called
a) Conduction
b) Convection
c) Radiation
d) Both (A) and (B)
Answer: (C)
So in this article we learn the topic Mechanical Multiple choice questions of Heat transfer hope you understand well.
Any query comment. Thanks for reading.
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