Process Control and Instrumentation MCQs with answers Page - 1

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Q. Phase lag of the frequency response of a second order system to a sinusoidal forcing function

  • (A) Is 30°
  • (B) Is 90° at the most
  • (C) Approaches 180° asymptotically
  • (D) Is 120°

A

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Q. Which of the following is not classified as a thermo electric pyrometer?

  • (A) Resistance thermometer
  • (B) Thermocouple
  • (C) Radiation pyrometer
  • (D) Optical pyrometer (disappearing filament type)

A

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Q. The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.

  • (A) Chromel-alumel
  • (B) Iron-constantan
  • (C) Platinum-platinum/rhodium
  • (D) None of these

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Q. __________ are analysed using a polarograph.

  • (A) Isotonic solutions
  • (B) Solids
  • (C) Liquids
  • (D) Gases

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Q. Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.

  • (A) Radiation
  • (B) Optical
  • (C) Photoelectric
  • (D) None of these

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Q. Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an

  • (A) Venturimeter
  • (B) Orificemeter
  • (C) Magnetic flow meter
  • (D) Hot wire anemometer

A

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Q. Response of a linear control system for a change in set point is called

  • (A) Frequency response
  • (B) Transient response
  • (C) Servo problem
  • (D) Regulator problem

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Q. Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

  • (A) 12
  • (B) 36
  • (C) 54
  • (D) 68

A

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Q. Which of the following measurements can be made by the measurement of emf?

  • (A) PH value
  • (B) Degree of hydrolysis
  • (C) Composition of complex ions
  • (D) All of the above

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Q. Conversion formula for converting amplitude ratio (AR) into decibels is

  • (A) Decibel = 20 log10 (AR)
  • (B) Decibel = 20 loge (AR)
  • (C) Decibel = 20 log10 (AR)0.5
  • (D) Decibel = 20 loge (AR)0.5

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