Lakshya Education MCQs

Question: 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
Options:
A.8, 0.6, 0.08
B.12, 0.6, 0.12
C.8, 0.6, 0.12
D.12, 0.4, 0.08
Answer: Option B

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More Questions on This Topic :

Question 1. 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 2. 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 3. Optical activity of a solution can be determined using a
  1.    Polarimeter
  2.    Polarograph
  3.    Dilatometer
  4.    Refractrometer
Answer: Option A
Question 4. For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a
  1.    Large area but small mass
  2.    High thermal conductivity
  3.    Small specific heat
  4.    All of the above
Answer: Option D
Question 5. Thermistors are made of
  1.    Ultra pure metals
  2.    Metal oxides
  3.    Iron-copper alloys
  4.    Nickel-chromium alloys
Answer: Option B
Question 6. 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

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