Electronics and Communication Engineering - Automatic Control Systems

31. 

For quadratic factor. In Bode log magnitude plot the high frequency asymptote is a straight line having the slope

A. -20 dB per decade
B. +20 dB per decade
C. -40 dB per decade
D. +40 dB per decade

Answer: Option C

Explanation:

For quadratic factor in denominator, slope at high frequencies is - 40 dB/decade.


32. 

For op-amp circuit of the given figure, Eo(s)/Ei(s) =

A.
B.
C.
D.

Answer: Option D

Explanation:

.


33. 

Assertion (A): When the phase margin of a control system is improved using a lead network, noise transmission increases.

Reason (R): Phase lead compensation increases bandwidth.

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 A

Explanation:

More bandwidth means more noise.


34. 

In liquid flow system the capacitance of a water tank is defined as

A.
B.
C.
D. none of the above

Answer: Option A

Explanation:

Electrical and dQ is analogous to change in amount of liquid and dv is analogous to change in head.


35. 

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

A. T(1 - e-t/T)
B. t - T + T e-t/T
C. t + T + T e-t/T
D. t + 2T e-t/T

Answer: Option B

Explanation:

.