Process Control and Instrumentation MCQs with answers Page - 8

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Q. Thermal conductivity measurement is used for the determination of

  • (A) O2 percentage in the flue gas
  • (B) Specific gravity of petrofuels
  • (C) Composition of an alloy
  • (D) CO2 percentage in the flue gas

A

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Q. Bode diagram are generated from output response of the system subjected to which of the following input?

  • (A) Impulse
  • (B) Step
  • (C) Ramp
  • (D) Sinusoidal

A

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Q. Working principle of mercury in glass thermometer is based on the __________ of mercury with increase in temperature.

  • (A) Increase of pressure
  • (B) Increase of thermal conductivity
  • (C) Volumetric expansion
  • (D) Differential linear expansion

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Q. Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature

  • (A) Emf produced is very low of the order of microvolt
  • (B) Embrittlement of iron occurs
  • (C) Rusting of iron takes place
  • (D) Both B and C

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Q. A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

  • (A) Kc is reduced
  • (B) Kc is increased
  • (C) Integral control action is introduced
  • (D) Derivative control action is introduced

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Q. Temperature measuring instruments are standardised mostly with __________ points of pure substances.

  • (A) Melting
  • (B) Boiling
  • (C) Both A & B
  • (D) Neither A nor B

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Q. Flow rate through an orifice is __________ the pressure differential.

  • (A) Proportional to
  • (B) Inversely proportional to the square root of
  • (C) Proportional to the square root of
  • (D) Inversely proportional to the square of

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Q. Bode stability method uses __________ loop transfer function.

  • (A) Open
  • (B) Closed
  • (C) Either A or B
  • (D) Neither A nor B

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Q. Characteristic equation is the denominator of __________ loop transfer function.

  • (A) Open
  • (B) Closed
  • (C) Both A & B
  • (D) Neither A nor B

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Q. Routh stability method uses __________ loop transfer function.

  • (A) Open
  • (B) Closed
  • (C) Either A or B
  • (D) Neither A nor B

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