Question:

If a Nyquist plot of G (jω) H (jω) for a closed loop system passes through (-2, j0) point in GH plane, what would be the value of gain margin of the system in dB?

A.

0 db

B.

2.0201 db

C.

4 db

D.

6.0205 db

Answer» d. 6.0205 db

Question:

Nichol’s chart:

A.

constant gain and constant phase shift loci of the closed-loop system.

B.

plot of loop gain with the variation in frequency

C.

circles of constant gain for the closed loop transfer function

D.

circles of constant phase shift for the closed loop transfer function

Answer» b. plot of loop gain with the variation in frequency

Question:

Scientist Nyquist have contribution in:

A.

asymptotic plots

B.

polar plots

C.

root locus technique

D.

constant m and n circle

Answer» b. polar plots

Question:

For Nyquist contour, the size of radius is

A.

25

B.

0

C.

1

D.

∞

Answer» d. ∞

Question:

Derivative error compensation:

A.

improvement in transient response

B.

reduction in steady state error

C.

reduction is settling time

D.

increase in damping constant

Answer» d. increase in damping constant

Question:

Lag-lead compensation is a:

A.

increases bandwidth

B.

attenuation

C.

increases damping factor

D.

second order

Answer» d. second order

Question:

Rate compensation :

A.

increases bandwidth

B.

attenuation

C.

increases damping factor

D.

second order

Answer» c. increases damping factor

Question:

A system has poles at 0.01 Hz, 1 Hz and 80Hz, zeroes at 5Hz, 100Hz and 200Hz. The approximate phase of the system response at 20 Hz is :

A.

-90°

B.

0° c) 90°

C.

d) -180°

Answer» a. -90°