Automatic Control Systems(Engineering > Electrical Engineering ) Questions and Answers

Question 1. In control systems the output of sensor usually, is
  1.     Analog electrical signal
  2.     Digital electrical signal
  3.     Mechanical signal
  4.     Analog or digital electrical signal
Explanation:-
Answer: Option D. ->  Analog or digital electrical signal
Question 2. 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 3. 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 4. Integral control action
  1.     Removes offset
  2.     May lead to oscillatory response
  3.     Both (a) and (b)
  4.     Neither (a) nor (b)
Explanation:-
Answer: Option C. ->  Both (a) and (b)
Question 5. For type 1 system the velocity lag error is
  1.     Inversely proportional to bandwidth of system
  2.     Directly proportional to gain constant
  3.     Inversely proportional to gain constant
  4.     Independent of gain constant
Explanation:-
Answer: Option C. ->  Inversely proportional to gain constant
Question 6. Lag compensation permits a high gain at low frequencies.
  1.     True
  2.     False
  3.     Always occur in complex conjugate pairs
  4.     None of the above
Explanation:-
Answer: Option A. ->  True
Question 7. 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 8. 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 9. 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 10. In bode plots the frequency at which two asymptotes meet is called corner frequency.
  1.     True
  2.     False
  3.     Motor friction and load
  4.     Field resistance
Explanation:-
Answer: Option A. ->  True
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