Heat Transfer

321. Solid angle subtended by the finite surface at the radiating element is

  1. Called the view factor
  2. Called the angle of vision
  3. Proportional to the square of the distance between surfaces
  4. Expressed in terms of radians
Correct answer: (B)
Called the angle of vision

322. Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that

  1. There is no internal heat generation
  2. Boundary surfaces are isothermal
  3. Material is anisotropic
  4. Constant temperature gradient exists
Correct answer: (C)
Material is anisotropic

323. Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low

  1. Hardness
  2. Dissolved solids content
  3. Suspended solids content
  4. All (A), (B) and (C)
Correct answer: (D)
All (A), (B) and (C)

324. Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively).

  1. C/E
  2. E/C
  3. CE
  4. 1/CE
Correct answer: (A)
C/E

325. Steam economy in case of a triple effect evaporator will be

  1. 1
  2. < 1
  3. > 1
  4. Between 0 and 1
Correct answer: (C)
> 1

326. Steam is routed through the tube in case of a _________ evaporator.

  1. Basket type
  2. Horizontal tube
  3. Short tube vertical
  4. Long tube vertical
Correct answer: (B)
Horizontal tube

327. Steam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is

  1. Vertical heat exchanger with steam on tube side
  2. Vertical heat exchanger with steam on shell side
  3. Horizontal heat exchanger with steam on tube side
  4. Horizontal heat exchanger with steam on shell side
Correct answer: (B)
Vertical heat exchanger with steam on shell side

328. Steam side heat transfer co-efficient in an evaporator is in the range of _________ kcal/hr.m2°C.

  1. 18537
  2. 100-500
  3. 1000-1500
  4. 5000-15000
Correct answer: (D)

5000-15000

329. Steam trap is used to

  1. Condense the steam flowing in the pipeline
  2. Remove water resulting from partial condensation of steam
  3. Stop the supply of steam
  4. None of these
Correct answer: (B)
Remove water resulting from partial condensation of steam

330. Steam traps are provided in steam carrying pipelines to

  1. Condense steam
  2. Release excess steam pressure by bleeding steam
  3. Remove condensate and inert gases
  4. None of these
Correct answer: (C)
Remove condensate and inert gases
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