Electronics and Communication Engineering - Automatic Control Systems

1. 

For a second order system with 0 < ξ < 1, the angle which poles make with negative real axis is

A. sin-1 ξ
B. cos-1 ξ
C. tan-1 ξ
D. cot-1 ξ

Answer: Option B

Explanation:

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2. 

The resolution of a wire wound potentiometer is about

A. 0.001%
B. 0.1%
C. 1%
D. 5%

Answer: Option B

Explanation:

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3. 

Consider the following statements

  1. The effect of feedback is to reduce system error
  2. Feedback increases the system gain at one frequency but reduces the system gain as another frequency
  3. Feedback can cause an originally stable system to become unstable
Which of the above statements are correct?

A. 1, 2, 3
B. 1, 2
C. 2, 3
D. 1, 3

Answer: Option D

Explanation:

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4. 

M circles are symmetrical with respect to

A. real and imaginary axis
B. M = 1 straight line and real axis
C. M = 1 straight line and imaginary axis
D. M = 1 straight line

Answer: Option B

Explanation:

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5. 

A lag compensator

A. speeds up the transient response of the system
B. improves steady state behaviour of the system
C. improves steady state behaviour and speeds up the transient response of the system
D. improves steady state behaviour and preserves the transient response of the system

Answer: Option D

Explanation:

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