Electronics and Communication Engineering - Automatic Control Systems

46. 

A system has transfer function. If a sinusoidal input of frequency ω is applied the steady state output is of the form

A.
B. K1 K2 (1 + jω/T)
C. K1K2/jωT
D.

Answer: Option A

Explanation:

For sinusoidal input jω replaces s in the transfer function.


47. 

For the given figure C(s)/R(s) =

A.
B.
C.
D.

Answer: Option B

Explanation:

or .


48. 

For a quadratic factor in transfer function the phase angle is not a function of damping factor.

A. True
B. False

Answer: Option B

Explanation:

Damping ratio affects phase angle.


49. 

The current rating of dc tachogenerator is usually

A. small
B. high
C. medium
D. either (b) or (c)

Answer: Option A

Explanation:

Control systems require small current rating of components.


50. 

For the compensator in the given figure the maximum phase lead is

A. sin-1 (1/3)
B. 30°
C. 45°
D. 60°

Answer: Option B

Explanation:

Hence

Also sin φm = = 0.5 and φm = 30°.


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