# Multiple Choice Question (MCQ) of Control Systems page-2

11. At resonance peak, ratio of output to input is

a) Zero
b) Lowest
c) Highest
d) None of these

Ans: (c)

12. 0 type system has

c) High gain constant
d) Higher error with high K

Ans: (b)

13. If gain of the system is zero, then the roots

a) Coincide with the poles
b) Move away from the zeros
c) Move away from the poles
d) None of these

Ans: (a)

14. Settling time is inversely proportional to product of the damping ratio and

a) Time constant
b) Maximum overshoot
c) Peak time
d) Undamped natural frequency of the roots

Ans: (b)

15. If gain of the critically damped system is increased, the system will behave as

a) Under damped
b) Over damped
c) Critically damped
d) Oscillatory

Ans: (a)

16. If gain of the system is increased, then

a) Roots move away from the zeros
b) Roots move towards the origin of the S-plot
c) Roots move away from the poles
d) None of these

Ans: (c)

17. A low value of friction coefficient

a) Minimize the velocity lag error
b) Maximize the velocity lag error
c) Minimize the time constant of the system
d) Maximize the time constant of the system

Ans: (a)

18. Physical meaning of zero initial condition is that the

a) System is at rest and stores no energy
b) System is at rest but stores energy
c) Reference input to working system is zero
d) System is working but stores no energy

Ans: (a)

19. If overshoot is excessive, then damping ratio is

a) Equal to 0.4
b) Less than 0.4
c) More than 0.4
d) Infinity

Ans: (b)

20. For a desirable transient response of a second order system damping ratio must be between

a) 0.4 and 0.8
b) 0.8 and 1.0
c) 1.0 and 1.2
d) 1.2 and 1.4

Ans: (a)

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