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MCQs

Total Questions : 1634 | Page 8 of 164 pages
Question 71. The unit of 'time constant' of a system is the same as that of
  1.    Velocity
  2.    Time
  3.    (time)⁻¹
  4.    None of these
 Discuss Question
Answer: Option B. -> Time
Question 72. Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.
  1.    Steel
  2.    Vycor (a glass)
  3.    Nichrome
  4.    Inconel
 Discuss Question
Answer: Option B. -> Vycor (a glass)
Question 73. Silver point temperature is __________ °C.
  1.    760.5
  2.    860.5
  3.    960.5
  4.    1060.5
 Discuss Question
Answer: Option C. -> 960.5
Question 74. Nitrogen gas constant volume thermometer is suitable for measuring a temperature of __________ °C.
  1.    0-100
  2.    < 0
  3.    > 100
  4.    > 50
 Discuss Question
Answer: Option C. -> > 100
Question 75. Helium gas constant volume thermometer is suitable for the measurement of a temperature of __________ °C.
  1.    < 100
  2.    < 0
  3.    > 0
  4.    > 800
 Discuss Question
Answer: Option B. -> < 0
Question 76. The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is
  1.    5π/12
  2.    π/6
  3.    π/12
  4.    π/3
 Discuss Question
Answer: Option A. -> 5π/12
Question 77. Which of the following controllers has the least maximum deviation?
  1.    P-controller
  2.    P-I controller
  3.    P-I-D controller
  4.    P-D controller
 Discuss Question
Answer: Option D. -> P-D controller
Question 78. __________ controller has the maximum stabilising time.
  1.    P
  2.    PD
  3.    PI
  4.    PID
 Discuss Question
Answer: Option C. -> PI
Question 79. A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency. This is __________ criterion.
  1.    Bode stability
  2.    Nyquist
  3.    Routh stability
  4.    None of these
 Discuss Question
Answer: Option A. -> Bode stability
Question 80. In a single tank system, the transfer function of __________ to inlet flow rate is 1/TS+1.
  1.    Outlet flow rate
  2.    Level
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option A. -> Outlet flow rate

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