Heat Transfer MCQs with answers Page - 87

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Q. The numerical value of which property of air generally drops with rising temperature

  • (A) Thermal diffusivity
  • (B) Density
  • (C) Kinematic viscosity
  • (D) Thermal conductivity

A

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Q. For all substances the absorptivity must lie between

  • (A) 0 and + 0.5
  • (B) ?1 and +1
  • (C) ?0.5 and + 0.5
  • (D) 0 and 1

A

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Q. A black body absorbs all radiations. As a result of absorption of these radiations

  • (A) A black body shines
  • (B) The temperature of black body rises
  • (C) Black body radiates energy to other bodies
  • (D) Black body becomes good conductor of heat

A

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Q. A block of wood and a block of metal feel equally cold or equally hot when touched. Then their common temperature is

  • (A) 0?K
  • (B) 0?F
  • (C) 0?C
  • (D) the same as that of the human body

A

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Q. The expression (A2-A1)/loge (A2/A1) for a hollow cylinder is known as

  • (A) Logarithmic mean radius
  • (B) Mean area of heat transfer
  • (C) The rate of heat transfer
  • (D) None of the above

A

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Q. When a vapour condenses into a liquid

  • (A) It absorbs heat
  • (B) It evolves heat
  • (C) Its temperature rises
  • (D) Its temperature drops

A

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Q. If the absorptivity plus reflectivity of a body equals 1, then the body is known as

  • (A) Black body
  • (B) Grey body
  • (C) Opaque body
  • (D) White body

A

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Q. Prandtl number for liquid metals is generally in the range

  • (A) 1000 to 10,000
  • (B) 0.003 to 0.01
  • (C) 10 to 100
  • (D) 100 to 1000

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