Process Control and Instrumentation

261. What is the dynamic error in a critically damped second order instrument for a ramp input (At)?

  1. 0.5 AT
  2. 2 AT
  3. √(AT)
  4. 1.5 AT

Correct answer: (B)
2 AT

262. What is the Laplace transform of impulse input having magnitude „X‟?

  1. X
  2. X2
  3. 1/X
  4. 1

Correct answer: (D)
1

263. What is the Laplace transform of sin t?

  1. 1/(S2 + 1)
  2. s/(1 + S2)
  3. 1/(S2 - 1)
  4. s/(S2 - 1)

Correct answer: (A)
1/(S2 + 1)

264. What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?

  1. 0.1
  2. 3
  3. 13
  4. 29

Correct answer: (C)
13

265. What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?

  1. 1
  2. > 1
  3. < 1
  4. None of these

Correct answer: (C)
< 1

266. When the damping co-efficient (ξ) is unity, the system is

  1. Overdamped
  2. Critically damped
  3. Underdamped
  4. Highly fluctuating

Correct answer: (B)
Critically damped

267. Which is the most suitable instrument for measuring pressure below 3 microns?

  1. Mcleod gauge
  2. Alphatron
  3. Ionisation gauge
  4. Bourdon gauge

Correct answer: (C)
Ionisation gauge

268. Which is the strongest paramagnetic gas?

  1. CO2
  2. O2
  3. NO
  4. NO2

Correct answer: (B)
O2

269. Which of following error integral is considered as the best criterion in controller settings?

  1. ∫0∞ |e| dt
  2. ∫0∞ |e2| dt
  3. ∫0∞ e2 dt
  4. None of these

Correct answer: (C)
∫0∞ e2 dt

270. Which of the following can measure temperatures in the range of - 20 to 300°C?

  1. Mercury in glass thermometer
  2. Vapor pressure thermometer
  3. Resistance thermometer
  4. None of these

Correct answer: (D)
None of these

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