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Dear candidates you will find MCQ questions of Heat Transfer here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.

M

Mr. Dubey • 51.17K Points
Coach

Q. 221) In heat transfer, conductance equals conductivity (kcal/hr/sqm/°C/cm) divided by

(A) hr (time)
(B) sqm (area)
(C) °C (temperature)
(D) cm (thickness)
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M

Mr. Dubey • 51.17K Points
Coach

Q. 222) 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.
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M

Mr. Dubey • 51.17K Points
Coach

Q. 223) Which of the following has least value of conductivity

(A) glass
(B) water
(C) plastic
(D) air.
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M

Mr. Dubey • 51.17K Points
Coach

Q. 224) Which of the following is expected to have highest thermal conductivity

(A) steam
(B) solid ice
(C) melting ice
(D) water
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M

Mr. Dubey • 51.17K Points
Coach

Q. 225) Thermal conductivity of glass-wool varies from sample to sample because of variation in

(A) composition
(B) density
(C) porosity
(D) all of the above.
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M

Mr. Dubey • 51.17K Points
Coach

Q. 226) Thermal conductivity of a material may be defined as the

(A) quantity of heat flowing in one second through one cm cube of material when opposite faces ^re maintained at a temperature difference of 1°C
(B) quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C
(C) heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
(D) all of the above
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M

Mr. Dubey • 51.17K Points
Coach

Q. 227) Which of the following has maximum value of thermal conductivity

(A) aluminium
(B) steel
(C) brass
(D) copper
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M

Mr. Dubey • 51.17K Points
Coach

Q. 228) Moisture would find its way into insulation by vapour pressure unless it is prevented by

(A) high thickness of insulation
(B) high vapour pressure
(C) less thermal conductivity insulator
(D) a vapour seal
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M

Mr. Dubey • 51.17K Points
Coach

Q. 229) 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.
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M

Mr. Dubey • 51.17K Points
Coach

Q. 230) The ratio of heat flow Q1/Q2 from two walls of same thickness having their thermal conductivities as ATj – 2K2 will be

(A) I
(B) 0.5
(C) 2
(D) 0.25
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