Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

Consider the systems with following open loop transfer functions
If unity feedback is used, the increasing order of time taken for unit step response to settle is
A:
1, 2, 3
B:
3, 1, 2
C:
2, 3, 1
D:
3, 2, 1
Answer: C

. For the three systems the values of ΞΎΟ‰n are 1.8, 2.5 and 2 respectively.

Hence values of T are 0.55, 0.4 and 0.5 respectively.

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Assertion (A): The steady state response, of a stable, linear, time invariant system, to sinusoidal input depends on initial conditions.

Reason (R): Frequency response, in steady state, is obtained by replacing s in the transfer function by jω

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
R is correct but A is wrong
Answer: D

Steady state response does not depend on initial conditions.

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Bellows converts
A:
pressure difference into displacement
B:
pressure difference into voltage
C:
displacement into pressure difference
D:
either (a) or (c)
Answer: A

To measure pressure, it is convenient to convert pressure into displacement and then use a displacement transducer.

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A unity feedback system has open loop transfer function The closed loop transfer function is
A:
B:
C:
D:
Answer: B

.

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In the given figure, of potentiometer V0 = Vi (R0/Ri) only when
A:
RL = 0
B:
RL = ∞
C:
RL is neither low nor high
D:
RL is low but not zero
Answer: B

If RL is not infinite, the voltage ratio of potentiometer depends on the value of RL. This is called loading effect.

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