Heat Transfer MCQs with answers Page - 81

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Q. Body A is kept in contact with body B. Heat will flow from A to B, if

  • (A) The heat content of A is greater than that of B
  • (B) The temperature of A is greter than that of B
  • (C) The specific heat of A is greater than that of B
  • (D) The specific heat of A is lower than that of B

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Q. Thermal conductivity of air at room temperature is approximately

  • (A) 0.02 kcal/m-hr-?C
  • (B) 0.002 kcal/m-hr-?C
  • (C) 20.0 kcal/m-hr-?C
  • (D) 0.2 kcal/m-hr-?C

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Q. What energy transformation takes place when ice is converted into water

  • (A) Heat energy to kinetic energy
  • (B) Kinetic energy to heat energy
  • (C) Heat energy to latent heat
  • (D) Heat energy to potential energy

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Q. Which dimensionless number correlates the relative thickness of the hydrodynamic and thermal boundary layers?

  • (A) Mach number
  • (B) 37,500 kg
  • (C) Prandlt number
  • (D) Nusselt number

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Q. Which is the unit of Stefan Boltzmann constant

  • (A) W/m2 K4
  • (B) erg/cm2-sec-K4
  • (C) cal/cm2-sec K4
  • (D) All of the above

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Q. Elongation of a rod when heated

  • (A) Is proportional to original length
  • (B) Is proportional to length
  • (C) Is inversely proportional to linear strain
  • (D) Is inversely proportional to original length

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Q. A dimensionless number which is the ratio of mass heat flow rate to the heat flow rate by conduction under a unit temperature gradient and through a thickness L is known as

  • (A) Nusselt number
  • (B) Prandtl number
  • (C) Weber number
  • (D) Peclet number

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Q. The surface temperatures of a flat wall are 650?C and 450?C respectively and the thermal conductivity of the wall material is 0.30 kcal/m-hr-?C. The heat flux for a wall of 20 cm thickness will be

  • (A) 60 kcal/m2-hr
  • (B) 600 kcal/m2-hr
  • (C) 120 kcal/m2-hr
  • (D) 300 kcal/m2-hr

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Q. Which of the following is a minimum boiling azeotrope?

  • (A) Acetone-chloroform
  • (B) Molasses-water
  • (C) Benzene-toluene
  • (D) Carbon disulphide-acetone

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Q. In a psychrometric chart the abscissa represents

  • (A) Specific humidity
  • (B) Relative humidity
  • (C) Enthalpy
  • (D) Dry bulb temperature

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