Lakshya Education MCQs

Question: For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a
A.Large area but small mass
B.High thermal conductivity
C.Small specific heat
D.All of the above
Answer: Option D

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Question 1. Suppose that the gain, time constant and dead time of a process with the following transfer function:Gc(s) = 10 exp( - 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as
  1.    8, 0.6, 0.08
  2.    12, 0.6, 0.12
  3.    8, 0.6, 0.12
  4.    12, 0.4, 0.08
Answer: Option B
Question 2. 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
Answer: Option A
Question 3. 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
Answer: Option C
Question 4. Thermistors are made of
  1.    Ultra pure metals
  2.    Metal oxides
  3.    Iron-copper alloys
  4.    Nickel-chromium alloys
Answer: Option B
Question 5. Thermocouple in a thermal well behaves as a true
  1.    First order system
  2.    Second order system (overdamped)
  3.    Multiple first order system
  4.    Second order system (underdamped)
Answer: Option C
Question 6. Thermal wells are used in the temperature measurement to
  1.    Guard against corrosive and oxidising action on thermocouple materials
  2.    Reduce measuring lag
  3.    Increase the fidelity
  4.    Increase the sensitivity
Answer: Option A

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