Question:

If the gain of the open loop system is doubled, the gain of the system is :

A.

not affected

B.

doubled

C.

halved

D.

one fourth of the original value

Answer» a. not affected

Question:

In polar plots, what does each and every point represent w.r.t magnitude and angle?

A.

scalar

B.

vector

C.

phasor

D.

differentiator

Answer» c. phasor

Question:

According to Nyquist stability criterion, where should be the position of all zeros of q(s) corresponding to s-plane?

A.

on left half

B.

at the center

C.

on right half

D.

random

Answer» a. on left half

Question:

For a stable closed loop system, the gain at phase crossover frequency should always be:

A.

< 20 db

B.

< 6 db

C.

> 6 db

D.

> 0 db

Answer» d. > 0 db

Question:

Scientist Evans have contribution in :

A.

asymptotic plots

B.

polar plots

C.

root locus technique

D.

constant m and n circle

Answer» c. root locus technique

Question:

Phase lag controller:

A.

improvement in transient response

B.

reduction in steady state error

C.

reduction is settling time

D.

increase in damping constant

Answer» b. reduction in steady state error

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. ∞