Process Control and Instrumentation MCQs with answers Page - 7

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Q. A bolometer is

  • (A) Used for the measurement of thermal radiation
  • (B) An element which senses optical input and delivers thermal output
  • (C) Both A & B
  • (D) Neither A nor B

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Q. Which of the following is not a speed measuring instrument?

  • (A) Psychrometer
  • (B) Stroboscope
  • (C) Tachometer
  • (D) All of the above

A

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Q. A stable system is the one

  • (A) For which the output response is bounded for all bounded input
  • (B) Which exhibits an unbounded response to a bounded input
  • (C) Which satisfies the conditions for a servo problem
  • (D) None of these

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Q. Which of the following is the dynamic characteristics of an instrument?

  • (A) Reproducibility
  • (B) Sensitivity
  • (C) Dead zone
  • (D) Fidelity

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Q. Radiation thermometer can not measure the temperature

  • (A) Inside a pressure vessel
  • (B) Of an object without coming in contact with it
  • (C) Of liquid oxygen
  • (D) Of moving objects at high temperature

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Q. Liquid flow rate in a small channel is best measured by a/an

  • (A) Weir
  • (B) Pitot tube
  • (C) Vane meter
  • (D) Venturimeter

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Q. High temperature of around 2000°C of incandescent gas mantles is measured by a/an

  • (A) Specially designed thermocouple
  • (B) Optical pyrometer
  • (C) Radiation pyrometer
  • (D) None of these

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Q. Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.

  • (A) Oxygen in
  • (B) Carbon dioxide in
  • (C) Carbon monoxide in
  • (D) Temperature of

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Q. Which of the following filled system expansion thermometer has the capability to measure the lowest temperature?

  • (A) Mercury in glass thermometer
  • (B) Mercury in steel thermometer
  • (C) Alcohol in glass thermometer
  • (D) Fused metal (Na or K) in steel thermometer

A

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Q. A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency. This is __________ criterion.

  • (A) Bode stability
  • (B) Nyquist
  • (C) Routh stability
  • (D) None of these

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