ISRO 2018 Heat Transfer Booster Quiz 1

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Question 1

The figure below shows the variation of temperature inside a heat conducting wall. Which of the following is a wrong statement?

• AThe temperature profile A suggests that the wall is a perfect insulator and that there is no flow of heat from one face of the wall to another face.
• BThe curve B pertains to the wall material for which thermal conductivity increases with temperature rise, i.e.,
• CThe linear temperature profile C indicates that the thermal conductivity is not affected by temperature.
• DThe curve D shows that thermal conductivity of the wall material decreases with temperature rise, i.e., thermal conductivity follows a relation of the form

Question 2

The heat transfer coefficient (h) in forced convection depends on how many variables

• A2
• B8
• C6
• D4

Question 3

Fourier law is also known as

• ARate law of conduction
• BRate law of convection
• CRate law of radiation
• DRate law of cooling

Question 4

For sphere of outer radius r₂, inner radius r₁ and thermal conductivity K, the resistance in heat transfer is given by

• Ar₂-r₁ /(4πKr₂ r₁)
• Br+r₁ /(4πKr₂ r₁)
• C(r₂+r₁ /4πKr₂ r₁)^1/2
• DNone of these

Question 5

For a black body, the emissive power of black body is ____ the total amount of energy emitted from a surface per unit time and per unit area.

• AEqual to
• BGreater than
• CSmaller than
• DNot related to

Question 6

Consider a surface at 7°C that may be assumed to be a blackbody in an environment at 25°C. If 300 W/m² of radiation is incident on the surface, the radiosity of this black surface is ______ W/m².

• A348.5
• B334.6
• C340.2
• D365.4

Question 7

The main objective of a heat exchanger is to recover or reject heat, so in other applications of heat exchanger the objective may be to :

• ASterilize
• BPasteurize
• CDistill
• DAll of these

Question 8

A ice-cream cone spherical in shape has diameter 10 cm. The cones cavity is enclosed by flat lid(surface 2) at the bottom. The shape factor F₂₁ is;

• A0
• B1
• C0.5
• D0.6

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