Process Control and Instrumentation MCQs with answers Page - 5

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Q. Select the correct statement from the following.

  • (A) The frequency response of a pure capacity process is unbounded
  • (B) The phase lag of a pure time delay system decreases with increasing frequency
  • (C) The amplitude ratio of a pure capacity process is inversely proportional to frequency
  • (D) The amplitude ratio of a pure time delay system increases with frequency

A

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Q. All the thermocouples used for temperature measurement use dissimilar metal

  • (A) Strips
  • (B) Bars
  • (C) Wires
  • (D) Beads

A

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Q. Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability?

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

A

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Q. Thermal wells used in temperature measurements should have

  • (A) Very thick walls
  • (B) Low emissivity
  • (C) Polished surface
  • (D) High transmissivity of radiation

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Q. Process degree of freedom indicates __________ number of controllers to be used.

  • (A) The maximum
  • (B) The minimum
  • (C) Both maximum and the minimum
  • (D) Nothing about the

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Q. Bimetal strips are not used in

  • (A) Bimetallic thermometers
  • (B) Thermocouples
  • (C) Thermostats
  • (D) Relays for opening & closing of electrical circuits

A

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Q. Bode diagram is a plot of

  • (A) Log (AR) vs. log (f) and (Φ) vs. log (f)
  • (B) Log (AR) vs. f and log Φ vs.f
  • (C) AR vs. log (f) and Φ vs. log (f)
  • (D) None of these

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Q. Bourdon tube is never made of

  • (A) Phosphor bronze
  • (B) Monel metal
  • (C) Stainless steel
  • (D) Cast iron

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Q. Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?

  • (A) Platinum-platinum + rhodium
  • (B) Iron-constantan
  • (C) Copper-constantan
  • (D) Chromel-alumel

A

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Q. Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is

  • (A) Water
  • (B) Carbon tetrachloride
  • (C) Paraffin
  • (D) Ethylene glycol

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