Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

Derivative control action is effective?
A:
Only during steady state periods
B:
Only during transient state periods
C:
During both steady state and transient state periods
D:
Either during steady state or during transient state periods
Answer: B

Derivative of constant is zero. Hence derivative control action is not effective is steady state.

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A system has .If x(t) = t2, Y(s) is
A:
B:
C:
D:
Answer: C

.

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For the system of the given figure, the closed loop poles are at
A:
0 and -4
B:
-2 ± j6
C:
2 ± j6
D:
-3 ± j8
Answer: B

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For the characteristic equation s2 + 4s + 10 = 0, the roots are -2 ± j 6.

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In position control system the device used for providing rate feedback voltage is
A:
potentiometer
B:
synchro-transmitter
C:
synchro-transformer
D:
tacho generator
Answer: D

Tacho generator provides a voltage whose magnitude is proportional to speed.

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Which of the following is not a necessary advantage of negative feedback system?
A:
Feedback improves speed of response
B:
Feedback improves stability
C:
Feedback reduces effect of variations in system parameters
D:
Feedback reduces the effect of external disturbances
Answer: B

Feedback may or may not improve stability. Moreover feedback may also cause instability.

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