Electronics and Communication Engineering - Automatic Control Systems

6. 

In the given figure shows pole-zero plot. If steady state gain is 2 the transfer function G(s) is

A.
B.
C.
D.

Answer: Option A

Explanation:

The zero at - 1 gives the term (s + 1) in the numerator.

The poles at (- 2 + j1) and (- 2 - j1) give (s2 + 4s + 5) term is the denominator. Gain is 2.


7. 

If a system is to follow arbitrary inputs accurately the bandwidth should be

A. large
B. small
C. very small
D. neither small nor large

Answer: Option A

Explanation:

Arbitrary inputs require large bandwidth.


8. 

For the system of the given figure, the damping ratio of closed loop poles is

A. 1.5
B. 1
C. 0.5
D. 0.25

Answer: Option C

Explanation:

The standard form of characteristic equation is .

Therefore .


9. 

Assertion (A): Potentiometers can not be used as error detectors in position control systems.

Reason (R): The resolution of a potentiometer places an upper limit on its accuracy

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: Option D

Explanation:

Potentiometers are used as error detectors.


10. 

For a first order system having transfer function , the unit impulse response is

A. e-t/T
B. T e-t/T
C.
D. T2 e-t/T

Answer: Option C

Explanation: