Process Control and Instrumentation

191. Temperature of _________ cannot be measured by an optical or radiation pyrometer.

  1. Hot blast (air) from stoves
  2. Molten slag flowing out of blast furnace
  3. Combustion space in boilers
  4. Rotary limestone calcination kiln

Correct answer: (A)
Hot blast (air) from stoves

192. Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an

  1. Chromel-alumel thermocouple
  2. Optical pyrometer
  3. Radiation pyrometer
  4. Either (B) or (C)

Correct answer: (D)
Either (B) or (C)

193. The _________ of a vapor pressure thermometer is a functioning element.

  1. Pointer
  2. Bourdon tube
  3. Bulb
  4. None of these

Correct answer: (A)
Pointer

194. The _________ of a vapor pressure thermometer is a primary element.

  1. Pointer
  2. Bourdon tube
  3. Bulb
  4. None of these

Correct answer: (C)
Bulb

195. The _________ of a vapor pressure thermometer is a secondary element.

  1. Pointer
  2. Bourdon tube
  3. Bulb
  4. None of these

Correct answer: (B)
Bourdon tube

196. The _________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.

  1. Pressure
  2. Volume
  3. Viscosity
  4. All (A), (B) and (C)

Correct answer: (D)
All (A), (B) and (C)

197. The amplitude ratio for the sinusoidal response of _________ is < 1.

  1. Transportation lag
  2. First order system
  3. Second order system
  4. None of these

Correct answer: (B)
First order system

198. The amplitude ratio for the sinusoidal response of a _________ is 1.

  1. First order system
  2. Second order system
  3. Transportation lag
  4. None of these

Correct answer: (C)
Transportation lag

199. The characteristic equation for the control system with a closed loop transfer function G1/1 + G2 is given by 1 + G2 = 0. The characteristic equation for the control system

  1. Depends only upon the open loop transfer function
  2. Determines its stability
  3. Is the same for set point or load changes
  4. All 'a', 'b' & 'c'

Correct answer: (D)
All 'a', 'b' & 'c'

200. The closed loop pole of a stable second order system could be

  1. Both real and positive
  2. Complex conjugate with positive real parts
  3. Both real and negative
  4. One real positive and the other real negative

Correct answer: (A)
Both real and positive

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