Process Equipment and Plant Design

71. Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, ζ = yield strength and E = modulus of elasticity)

  1. E
  2. σ
  3. σ/E
  4. E/σ

Correct answer: (C)
σ/E

72. Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be

  1. d
  2. √d
  3. √(2πd)
  4. √(2d)

Correct answer: (A)
d

73. Excessive liquid gradient on a tray may result in the

  1. Maldistribution of gas
  2. Back trapping
  3. Gas blowing beneath cap skit
  4. All (A), (B) and (C)

Correct answer: (D)
All (A), (B) and (C)

74. Factor of safety (i.e., overdesign factor) in heat transfer equipments is about _________ percent more than the actual/theoretical design factor.

  1. 44109
  2. 15-20
  3. 30-35
  4. 35-40

Correct answer: (B)
15-20

75. Filtration rate is affected by the

  1. Pressure drop across the cake & filter medium
  2. Cake & filter medium resistance
  3. Area of filtering surface & the viscosity of filtrate
  4. All (A), (B) and (C)

Correct answer: (D)
All (A), (B) and (C)

76. Flanges are connected to pipes by

  1. Screwing
  2. Welding
  3. Brazing
  4. All (A), (B) and (C)

Correct answer: (D)
All (A), (B) and (C)

77. Floating head heat exchangers are used for the

  1. Heat transfer between corrosive fluids
  2. Cases where temperature difference between the shell and the tubes is more (>50°C)
  3. Co-current heat transfer systems
  4. Counter-current heat transfer systems

Correct answer: (B)
Cases where temperature difference between the shell and the tubes is more (>50°C)

78. For a 25 mm hole drilled in plates to be riveted, the shank diameter of the rivet should be _________ mm.

  1. 25
  2. 23
  3. 26
  4. 27

Correct answer: (B)
23

79. For a cylindrical internally pressurised vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness?

  1. Hemispherical
  2. Ellipsoidal (2 : 1)
  3. Conical
  4. Flat plate

Correct answer: (B)
Ellipsoidal (2 : 1)

80. For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for dia of the tank in question), the thickness of the courses of shell

  1. Decreases upwards
  2. Increases upwards
  3. Remains same throughout
  4. May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell

Correct answer: (A)
Decreases upwards

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