Automatic Control Systems(Electrical Engineering ) Questions and Answers

Question 1. Lag compensation permits a high gain at low frequencies.
  1.    True
  2.    False
Explanation:-
Answer: Option A. -> True
Question 2. Which of the following features is not associated with Nichols chart?
  1.    (0 dB, -180°) point on Nichols chart represent critical Point (-1, 0)
  2.    It is symmetric about -180°
  3.    M loci are centred about (0 dB, -180°) point
  4.    The frequency at intersection of G (j$$\omega $$) locus and M = +3 dB locus gives bandwidth of closed loop system
Explanation:-
Answer: Option D. -> The frequency at intersection of G (j$$\omega $$) locus and M = +3 dB locus gives bandwidth of closed loop system
Question 3. In root locus analysis the breakaway and break in points
  1.    lie on the real axis
  2.    Either lie on the real axis or occur in complex conjugate pairs
  3.    Always occur in complex conjugate pairs
  4.    None of the above
Explanation:-
Answer: Option B. -> Either lie on the real axis or occur in complex conjugate pairs
Question 4. The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.
  1.    True
  2.    False
Explanation:-
Answer: Option A. -> True
Question 5. A lag compensator
  1.    Speeds up the transient response of the system
  2.    Improves steady state behavior of the system
  3.    Improves steady state behavior and speeds up the transient response of the system
  4.    Improves steady state behavior and preserves the transient response of the system
Explanation:-
Answer: Option D. -> Improves steady state behavior and preserves the transient response of the system
Question 6. If any term in the first column of a Routh array becomes zero, then
  1.    Routh criterion cannot be used to determine stability
  2.    Routh criterion can be used by substituting a small positive number for zero and completing the array
  3.    Routh criterion can be used by substituting a big positive number for zero and completing the array
  4.    Routh criterion can be used by substituting a small negative number for zero and complet-ing the array
Explanation:-
Answer: Option B. -> Routh criterion can be used by substituting a small positive number for zero and completing the array
Question 7. A lead compensator
  1.    Speeds up the transient response
  2.    Increases the stability margin
  3.    Increases the stability margin and speeds up the transient-response.
  4.    None of the above
Explanation:-
Answer: Option C. -> Increases the stability margin and speeds up the transient-response.
Question 8. Robotic manipulator arms mostly use
  1.    Hydraulic actuator
  2.    Pneumatic actuator
  3.    Electric motor actuator
  4.    None of the above
Explanation:-
Answer: Option C. -> Electric motor actuator
Question 9. The relative stability of a system is given by
  1.    Gain margin alone
  2.    Phase margin alone
  3.    Both phase and gain margins
  4.    Either (a) or (b)
Explanation:-
Answer: Option C. -> Both phase and gain margins
Question 10. Transport lag usually exists in
  1.    Thermal systems
  2.    Hydraulic systems and thermal systems
  3.    Pneumatic systems
  4.    Thermal, hydraulic and pneumatic systems
Explanation:-
Answer: Option D. -> Thermal, hydraulic and pneumatic systems
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