Chemical Engineering Basics

641. The most commonly used moderator in nuclear power plants is

  1. Graphite
  2. Light water
  3. Heavy water
  4. Beryllium

Correct answer: (A)
Graphite

642. The most detrimental impurity in high pressure boiler feed water is

  1. Suspended salt
  2. Dissolved salt
  3. Silica
  4. Turbidity

Correct answer: (C)
Silica

643. The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be

  1. Parabolic
  2. Hyperbolic
  3. Straight line
  4. None of these

Correct answer: (A)
Parabolic

644. The most important consideration in value engineering is the

  1. Profit maximisation
  2. Customer satisfaction
  3. Cost reduction
  4. Process improvement

Correct answer: (B)
Customer satisfaction

645. The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system

  1. Is as light as possible
  2. Has very high C.O.P.
  3. Employs minimum quantity of refrigerant
  4. Consumer minimum horse power

Correct answer: (A)
Is as light as possible

646. The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is

  1. More
  2. Less
  3. Same
  4. More but less than the diameter of bolt

Correct answer: (A)
More

647. The most important requirement for aluminium industry is the availability of cheap

  1. Ore
  2. Electrical power
  3. Labour
  4. Abundant water

Correct answer: (B)
Electrical power

648. The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the

  1. Water alkalinity & leakage
  2. Hydrazine addition during feed water treatment
  3. Release of non-condensable gas from water in the boiler
  4. Scale formation

Correct answer: (C)
Release of non-condensable gas from water in the boiler

649. The most serious manufacturing defect from fracture toughness point of view is

  1. Surface roughness
  2. Pores
  3. Spherical inclusion
  4. Crack

Correct answer: (D)
Crack

650. The most suitable material for die casting is

  1. Iron
  2. Copper
  3. Steel
  4. Nickel

Correct answer: (B)
Copper

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