Chemical Engineering Basics

71. A material in which the atoms are arranged regularly in some directions but not in others, is termed as 'mesomorphous material'; an example of which is

  1. Lead
  2. Glass
  3. Mica
  4. Silver

Correct answer: (A)
Lead

72. A material is capable of resisting softening at high temperature, because of its property termed as

  1. Hot temper
  2. Hot hardness
  3. Fatigue
  4. Creep

Correct answer: (B)
Hot hardness

73. A material subjected __________ must have high resilience.

  1. Shock loading
  2. Vibration
  3. Fatigue
  4. Tension

Correct answer: (A)
Shock loading

74. A metal having a Poisson's ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is

  1. -0.8
  2. 0.8
  3. 0.08
  4. -0.24

Correct answer: (D)
-0.24

75. A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to

  1. √(Particle diameter)
  2. Particle diameter
  3. (Particle diameter)2
  4. (Particle diameter)3

Correct answer: (B)
Particle diameter

76. A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.

  1. 150
  2. 200
  3. 300
  4. 400

Correct answer: (B)
200

77. A psychrometer does not measure the __________ temperature of moist air.

  1. Dew point
  2. Dry bulb
  3. Wet bulb
  4. None of these

Correct answer: (A)
Dew point

78. A pycnometer is used for the measurement of

  1. Flow rate of molten metal
  2. Specific gravity of a liquid
  3. Composition of alloys
  4. Concentration of a solution

Correct answer: (B)
Specific gravity of a liquid

79. A reduction in thermal resistance during heat transfer does not occur in the

  1. Convection heat transfer by stirring the fluid and cleaning the heating surface
  2. Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity
  3. Radiation heat transfer by increasing the temperature and reducing the emissivity
  4. None of these

Correct answer: (C)
Radiation heat transfer by increasing the temperature and reducing the emissivity

80. A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons.

  1. Lack of free
  2. Excess of
  3. Decrease in
  4. None of these

Correct answer: (B)
Excess of

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