Chemical Engineering Basics

591. The condition of diffraction from a crystal is given by

  1. nλ = 2d Sin θ
  2. λ = d Sin 2θ
  3. λ = 2d Sin 2θ
  4. nλ = d Sin θ

Correct answer: (A)
nλ = 2d Sin θ

592. The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr.

  1. 100
  2. 200
  3. 1000
  4. 2000

Correct answer: (B)
200

593. The co-ordination number in simple cubic structure is

  1. 4
  2. 6
  3. 8
  4. 12

Correct answer: (B)
6

594. The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm2.

  1. 273.15
  2. 225.65
  3. 100.03
  4. 373.15

Correct answer: (B)
225.65

595. The delivery pressure of boiler feed water pump compared to the boiler steam pressure is

  1. Same
  2. Slightly less
  3. Slightly more
  4. Much more

Correct answer: (C)
Slightly more

596. The dew point of moist air becomes __________ with decrease in its relative humidity.

  1. Less than the wet bulb temperature
  2. More than the wet bulb temperature
  3. More than the dry bulb temperature
  4. Equal to wet bulb temperature

Correct answer: (A)
Less than the wet bulb temperature

597. The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then

  1. Wet bulb temperature=dry bulb temperature
  2. Wet bulb temperature=dew point temperature
  3. Saturation temperature=dew point temperature
  4. All 'a', 'b' & 'c'

Correct answer: (D)
All 'a', 'b' & 'c'

598. The difference between gross & net calorific values of fuel is due to the

  1. Sensible heat carried away by the flue gases
  2. Heat carried away by the steam from the moisture content of the fuel
  3. Heat lost by radiation
  4. Heat carried away by steam from the combustion of hydrogen in the fuel

Correct answer: (D)
Heat carried away by steam from the combustion of hydrogen in the fuel

599. The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm.

  1. 0.001
  2. 0.01
  3. 0.002
  4. 0.02

Correct answer: (C)
0.002

600. The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10-16 m2S-1 and it is 1.94 × 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole--1) for the diffusion of Ni in Cu is

  1. 130
  2. 180
  3. 230
  4. 250

Correct answer: (C)
230

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