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MCQs

Total Questions : 1634 | Page 13 of 164 pages
Question 121. Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.
  1.    63.2
  2.    87.5
  3.    95
  4.    100
 Discuss Question
Answer: Option C. -> 95
Question 122. The frequency response of a first order system, has a phase shift with lower and upper bounds given by
  1.    - ∞, π/2
  2.    -π/2, π/2
  3.    -π/2, 0
  4.    0, π/2
 Discuss Question
Answer: Option D. -> 0, π/2
Question 123. PH meter has
  1.    One cell
  2.    Two cells
  3.    Three cells
  4.    No cell
 Discuss Question
Answer: Option B. -> Two cells
Question 124. Phase margin is equal to
  1.    180° - phase lag
  2.    Phase lag - 180°
  3.    Phase lag + 180°
  4.    Phase lag + 90°
 Discuss Question
Answer: Option A. -> 180° - phase lag
Question 125. Pick out the wrong statement
  1.    Proportional controller is normally used for level control in industrial applications
  2.    CSTR can be considered as a distributed parameter system
  3.    Distributed parameter approach gives partial differential equation
  4.    Non-linear behaviour is exemplified by an on-off controller
 Discuss Question
Answer: Option B. -> CSTR can be considered as a distributed parameter system
Question 126. Pick out the wrong statement.
  1.    O₂, NO and NO₂ exhibit paramagnetic properties as a result of unpaired electrons
  2.    CO₂ is the strongest paramagnetic gas
  3.    Paramagnetic susceptibility of gases decreases with temperature
  4.    Paramagnetic susceptibility of gases permits the measurement of their concentration
 Discuss Question
Answer: Option B. -> CO₂ is the strongest paramagnetic gas
Question 127. Pick out the wrong statement.
  1.    There is no transfer lag for a single first order system
  2.    Stirred tank with a water jacket exemplifies an interacting system
  3.    Transfer lag is a characteristics of all higher order systems (other than first order systems)
  4.    Transfer lag decreases as the number of stages decreases
 Discuss Question
Answer: Option D. -> Transfer lag decreases as the number of stages decreases
Question 128. Emf generated in a thermocouple depends on the temperature
  1.    Of cold junction only
  2.    Of hot junction only
  3.    Difference between hot and cold junctions
  4.    Difference between cold junction and atmospheric temperature
 Discuss Question
Answer: Option C. -> Difference between hot and cold junctions
Question 129. Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by
  1.    Making the volume of thermometer bulb as large as conveniently possible
  2.    Reducing the volume of the capillary to a minimum
  3.    Reducing the volume of the receiving element to a minimum
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 130. Temperature of __________ can not be measured by an optical or radiation pyrometer.
  1.    Hot blast (air) from stoves
  2.    Molten slag flowing out of blast furnace
  3.    Combustion space in boilers
  4.    Rotary limestone calcination kiln
 Discuss Question
Answer: Option A. -> Hot blast (air) from stoves

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