Heat Transfer MCQs with answers Page - 12

Here, you will find a collection of MCQ questions on Heat Transfer. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. The average heat transfer co-efficient over the entire length of the plate (ha) and the local heat transfer co-efficient (hL), in case of heat transfer over a flat plate in lminar zone is related as

  • (A) Ha = 0.8hL
  • (B) Ha = 2hL
  • (C) Ha = hL
  • (D) Ha= 5hL

A

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Q. Prandtl and Reynolds analogy are same, when Prandtl number is

  • (A) 0.5
  • (B) 1
  • (C) > 2
  • (D) 1.5

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Q. Which of the following is not concerned with the heat transfer?

  • (A) Brinkman number
  • (B) Stanton number
  • (C) Schmidt number
  • (D) Peclet number

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Q. 1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m2 and the overall heat transfer co-efficient to the liquid is 1500 W/m2.°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

  • (A) 15 min
  • (B) 22 min
  • (C) 44 min
  • (D) 51 min

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Q. A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest ?

  • (A) Cube
  • (B) Plate
  • (C) Sphere
  • (D) All of the above

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Q. Choose the correct equation.

  • (A) Nu = (Re) (Pr) (Gz)
  • (B) Nu = (Re) (Pr) (St)
  • (C) Nu = (Re)(Pr)
  • (D) Nu = (Pr)(St)

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Q. In natural convection heat transfer, the correlating parameter is the

  • (A) Graetz number
  • (B) Eckert number
  • (C) Grashoff number
  • (D) Bond number

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Q. Pick out the wrong statement.

  • (A) Orifice baffles are never used in a shell and tube heat exchanger
  • (B) Pressure drop on the shell side of a heat exchanger depends upon tube pitch also
  • (C) In a horizontal tube evaporator, surface blanketing by air is avoided
  • (D) Split ring type and pull through type floating heads are two commonly used floating heads is heat exchangers

A

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Q. Unsteady state heat conduction occurs, when

  • (A) Temperature distribution is independent of time
  • (B) Temperature distribution is dependent on time
  • (C) Heat flows in one direction only
  • (D) Three dimensional heat flow is concerned

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