CONTROL SYSTEM SET 22

 CONTROL SYSTEM SET 22

1. For relative stability of the system which of the following is sufficient?
a) Gain margin
b) Phase margin
c) Both (a) and (b)
d) None of these
 

Ans: (c)
 

2. Slope in Bode plot is expressed as
a) – 6 db/decade
b) – 6 db/octave
c) – 7 db/octave
d) – 8 db/octave
 

Ans: (b)
 

3. Polar plots for+ve and –ve frequencies
a) Are always symmetrical
b) Can never be symmetrical
c) May be symmetrical
d) None of these
 

Ans: (a) 

4. Gain margin of a first or second order system is
a) Zero
b) 100
c) 1
d) Infinity
 

Ans: (d)
 

5. Frequency range over which response of the system is within acceptable limits is called system
a) Modulation frequency
b) Demodulation frequency
c) Carrier frequency
d) Band width
 

Ans: (d)
 

6. By adding a pole at s = 0, Nyquist plot of the system will
a) Shift 90° clockwise
b) Shift 90° anticlockwise
c) Shift 180°
d) Not change at all
 

Ans: (a)
 

7. A complex-conjugate pair of poles near the jw axis will produce a
a) High oscillatory mode of transient response
b) Steady state mode of response
c) Sinusoidal mode of response
d) None of these
 

Ans: (a)