Heat Transfer MCQs with answers Page - 5

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Q. Baffles in the shell side of a shell and tube heat exchanger

  • (A) Increase the cross-section of the shell side liquid
  • (B) Force the liquid to flow parallel to the bank
  • (C) Increase the shell side heat transfer co-efficient
  • (D) Decrease the shell side heat transfer co-efficient

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Q. Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then

  • (A) U1 = U2
  • (B) U2 > U1
  • (C) U1 > U2
  • (D) U1 = dirt factor - U2

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Q. The ratio of kinematic viscosity to thermal diffusivity is called the __________ number.

  • (A) Prandtl
  • (B) Peclet
  • (C) Nusselt
  • (D) Stanton

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Q. (NGr × NPr) is called the __________ number.

  • (A) Graetz
  • (B) Nusselt
  • (C) Stanton
  • (D) Reyleigh

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Q. h.D/K is called the __________ number.

  • (A) Nusselt
  • (B) Peclet
  • (C) Rayleigh
  • (D) Grashoff

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Q. The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is
(Stefan-Boltzman constant = 5.67 × 10-8 W/m2.K4)

  • (A) 727
  • (B) 800
  • (C) 1000
  • (D) 1200

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Q. Heat transfer by radiation between two bodies at T1 & T2 and in an ambient temperature of Ta°C depends on

  • (A) T1 - T2
  • (B) T1 - Ta
  • (C) T2 - Ta
  • (D) None of these

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Q. Which of the following is correct?

  • (A) Driving force = Rate × Resistance
  • (B) Rate = Driving force × Resistance
  • (C) Rate=Resistance / Driving force
  • (D) Resistance = Driving force × Rate

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Q. Double pipe heat exchangers are used

  • (A) When heat transfer area required is very high
  • (B) When heat transfer area required is very low, i.e (100 - 200 ft2)
  • (C) Because it occupies less floor area
  • (D) Because it is less costly

A

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Q. Loss of heat from untagged steam pipe to the ambient air is by

  • (A) Conduction
  • (B) Convection
  • (C) Radiation
  • (D) All of the above

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