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MCQs

Total Questions : 1634 | Page 3 of 164 pages
Question 21. Time constant is the
  1.    Time taken by the controlled variable to reach 63.2% of its full change
  2.    Same as transportation lag
  3.    Same as dead time
  4.    Time required by the measured variable to reach 63.2% of its ultimate change
 Discuss Question
Answer: Option A. -> Time taken by the controlled variable to reach 63.2% of its full change
Question 22. 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
 Discuss Question
Answer: Option C. -> < 1
Question 23. Optical activity of a solution can be determined using a
  1.    Polarimeter
  2.    Polarograph
  3.    Dilatometer
  4.    Refractrometer
 Discuss Question
Answer: Option A. -> Polarimeter
Question 24. Which of the following is never used as an element of industrial resistance thermometer?
  1.    Lead
  2.    Nickel
  3.    Copper
  4.    30% iron + 70% nickel
 Discuss Question
Answer: Option A. -> Lead
Question 25. Working principle of radiation pyrometer is based on the
  1.    Wien's law
  2.    Kirchoffs law
  3.    Stafan-Boltzman law
  4.    Seebeck effect
 Discuss Question
Answer: Option C. -> Stafan-Boltzman law
Question 26. Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.
  1.    No change
  2.    Decrease
  3.    Increase
  4.    Exponential decrease
 Discuss Question
Answer: Option C. -> Increase
Question 27. On-off controllers are normally used for
  1.    Low loads
  2.    Temperature changes
  3.    Flow rate changes
  4.    None of these
 Discuss Question
Answer: Option A. -> Low loads
Question 28. A pyranometer is an instrument used for measuring the
  1.    Beam radiation
  2.    Global radiation
  3.    Bright sunshine period
  4.    None of these
 Discuss Question
Answer: Option B. -> Global radiation
Question 29. A pyrheliometer is an instrument used for measuring the
  1.    Bright sunshine period
  2.    Beam radiation
  3.    Diffuse radiation
  4.    None of these
 Discuss Question
Answer: Option B. -> Beam radiation
Question 30. Feed forward controller accounts for the __________ changes.
  1.    Set point
  2.    Load
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option B. -> Load

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