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MCQs

Total Questions : 1634 | Page 14 of 164 pages
Question 131. Psychrometer determines the
  1.    Humidity of gases
  2.    Moisture content of solids
  3.    Water of crystallisation
  4.    Hygroscopic nature of solids
 Discuss Question
Answer: Option A. -> Humidity of gases
Question 132. 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 of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 133. Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?
  1.    Water
  2.    Mercury
  3.    Methyl alcohal
  4.    Carbon-tetrachloride
 Discuss Question
Answer: Option B. -> Mercury
Question 134. Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are
  1.    Air to open valve with the controller direct acting
  2.    Air to close valve with the controller indirect acting
  3.    Air to open valve with the controller indirect acting
  4.    Air to close valve with the controller direct acting
 Discuss Question
Answer: Option C. -> Air to open valve with the controller indirect acting
Question 135. The temperature range for which copper resistance thermometer can be used is __________ °C
  1.    0 to 150
  2.    -200 to 150
  3.    350 to 750
  4.    500 to 900
 Discuss Question
Answer: Option B. -> -200 to 150
Question 136. Number of poles in a system with transfer function 1/(s² + 2s² + 1) is
  1.    2
  2.    5
  3.    3
  4.    1
 Discuss Question
Answer: Option C. -> 3
Question 137. Bourdon gauges are used for measuring pressure (kg/cm² )
  1.    < atmospheric
  2.    > 2 (gauge)
  3.    < 2 (gauge)
  4.    > 10 (absolute)
 Discuss Question
Answer: Option B. -> > 2 (gauge)
Question 138. Which of the following is an undesirable dynamic characteristic of an instrument?
  1.    Reproducibility
  2.    Dead zone
  3.    Time lag
  4.    Static error
 Discuss Question
Answer: Option C. -> Time lag
Question 139. Which of the following is a desirable characteristic of an instrument?
  1.    High drift
  2.    High fidelity
  3.    High measuring lag
  4.    Poor reproducibility
 Discuss Question
Answer: Option B. -> High fidelity
Question 140. __________ is the static characteristics of an instrument,
  1.    Response
  2.    Tine lag
  3.    Drift
  4.    Dynamic error
 Discuss Question
Answer: Option C. -> Drift

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