Process Equipment and Plant Design

31. A minimum clearance of about _________ mm is maintained between the distillation column wall and the bubble cap.

  1. 19
  2. 38
  3. 67
  4. 95

Correct answer: (B)
38

32. A perforated plate has holes of diameter dn arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by

  1. (ph - dh)/ph
  2. (ph - dh . dt/2)/ph
  3. (ph - dt)/ph
  4. (ph - dh)/dh

Correct answer: (C)
(ph - dt)/ph

33. A pipe is generally made of circular cross-section, because a circular cross-section has the

  1. Higher structural strength
  2. Lowest surface area requirement for a given volume
  3. Both (A) & (B)
  4. None of these

Correct answer: (C)
Both (A) & (B)

34. A pressure vessel is said to be made of 'thick' shell, if the ratio of its diameter to wall thickness is

  1. < 10
  2. > 10
  3. > 20
  4. < 20

Correct answer: (B)
> 10

35. A riveted joint does not fail by _________ of rivets.

  1. Tearing
  2. Shearing
  3. Tearing of the plate across a row
  4. None of these

Correct answer: (D)
None of these

36. A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is

  1. Bending
  2. Deformation
  3. Shear
  4. Elongation

Correct answer: (A)
Bending

37. A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of

  1. 2
  2. 20.8
  3. 20.2
  4. None of these

Correct answer: (B)
20.8

38. A stuffing box is used for

  1. Absorbing the contraction/expansion of pipeline due to temperature changes
  2. Prevention of fluid leakage around moving parts
  3. Facilitating smooth opening and closing of a valve
  4. Reducing the resistance of fluid flow

Correct answer: (B)
Prevention of fluid leakage around moving parts

39. A/an _________ is used for changing the direction of a pipeline.

  1. Elbow
  2. Union
  3. Flange
  4. Disc compensator

Correct answer: (A)
Elbow

40. Accidents in chemical plants are mostly due to

  1. Inadequate equipment design
  2. Faulty operating procedures
  3. Improper layout of the equipments
  4. Failure of equipments

Correct answer: (B)
Faulty operating procedures

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