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MCQs

Total Questions : 1634 | Page 9 of 164 pages
Question 81. Which of the systems having following transfer functions is stable?
  1.    1/(s²+ 2)
  2.    1/(s²-2s + 3)
  3.    1/(s² + 2s + 2)
  4.    Exp(-20s)/(s² + 2s-l)
 Discuss Question
Answer: Option C. -> 1/(s² + 2s + 2)
Question 82. For an input forcing function, X(t) = 2t², the Laplace transform of this function is
  1.    2/s²
  2.    4/s²
  3.    2/s³
  4.    4/s³
 Discuss Question
Answer: Option D. -> 4/s³
Question 83. Thermal conductivity measurement is used for the determination of
  1.    O₂ percentage in the flue gas
  2.    Specific gravity of petrofuels
  3.    Composition of an alloy
  4.    CO₂ percentage in the flue gas
 Discuss Question
Answer: Option D. -> CO₂ percentage in the flue gas
Question 84. Bode diagram are generated from output response of the system subjected to which of the following input?
  1.    Impulse
  2.    Step
  3.    Ramp
  4.    Sinusoidal
 Discuss Question
Answer: Option D. -> Sinusoidal
Question 85. Working principle of mercury in glass thermometer is based on the __________ of mercury with increase in temperature.
  1.    Increase of pressure
  2.    Increase of thermal conductivity
  3.    Volumetric expansion
  4.    Differential linear expansion
 Discuss Question
Answer: Option C. -> Volumetric expansion
Question 86. Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1).
  1.    W = 1/√14, Kc = 45/7√14
  2.    W = √(7/6), Kc = 46/3
  3.    W = 1, Kc = 13
  4.    W = √(7/8), Kc = 45/4
 Discuss Question
Answer: Option B. -> W = √(7/6), Kc = 46/3
Question 87. Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature
  1.    Emf produced is very low of the order of microvolt
  2.    Embrittlement of iron occurs
  3.    Rusting of iron takes place
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 88. A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if
  1.    Kc is reduced
  2.    Kc is increased
  3.    Integral control action is introduced
  4.    Derivative control action is introduced
 Discuss Question
Answer: Option B. -> Kc is increased
Question 89. Temperature measuring instruments are standardised mostly with __________ points of pure substances.
  1.    Melting
  2.    Boiling
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 90. Bode stability method uses __________ loop transfer function.
  1.    Open
  2.    Closed
  3.    Either A or B
  4.    Neither A nor B
 Discuss Question
Answer: Option A. -> Open

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