Control system mcq part -4

1. In a system low friction co-efficient facilitates
(a) reduced velocity lag error
(b) increased velocity lag error
(c) increased speed of response
(d) reduced time constant of the system

Ans: a

2. Hydraulic torque transmission system is analog of
(a) amplidyne set
(b) resistance-capacitance parallel circuit
(c) motor-generator set
(d) any of the above

Ans: a

3. Spring constant in force-voltage analogy is analogous to
(a) capacitance
(b) reciprocal of capacitance
(c) current
(d) resistance

Ans: b

4. The frequency and time domain are related through which of the following?
(a) Laplace Transform and Fourier Integral
(b) Laplace Transform
(c) Fourier Integral
(d) Either (b) or (c)

Ans: a

5. An increase in gain, in most systems, leads to
(a) smaller damping ratio
(b) larger damping ratio
(c) constant damping ratio
(d) none of the above

Ans: a

6. Static error coefficients are used as a measure of the effectiveness of closed loop systems for specified ________ input signal.
(a) acceleration
(b) velocity
(c) position
(d) all of the above

Ans: d

7. A conditionally stable system exhibits poor stability at
(a) low frequencies
(b) reduced values of open loop gain
(c) increased values of open loop gain
(d) none of the above

Ans: b

8. The type 0 system has ______ at the origin.
(a) no pole
(b) net pole
(c) simple pole
(d) two poles
(e) none of the above

Ans: a

9. The type 1 system has ______ at the origin.
(a) no pole
(b) net pole
(c) simple pole
(d) two poles

Ans: c

10. The type 2 system has ______ at the origin.
(a) no net pole
(b) net pole
(c) simple pole
(d) two poles

Ans: d

11. The position and velocity errors of a type-2 system are
(a) constant, constant
(b) constant, infinity
(c) zero, constant
(d) zero, zero

Ans: c

12. Velocity error constant of a system is measured when the input to the system is unit _______ function.
(a) parabolic
(b) ramp
(c) impulse
(d) step

Ans: b

13. In case of type-1 system steady state acceleration is
(a) unity
(b) infinity
(c) zero
(d) 10

Ans: b

14. If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is
(a) not necessarily stable
(b) stable
(c) unstable
(d) always unstable
(e) any of the above

Ans: a

15. Which of the following is the best method for determining the stability and transient response ?
(a) Root locus
(b) Bode plot
(c) Nyquist plot
(d) None of the above

Ans: a

16. Phase margin of a system is used to specify which of the following ?
(a) Frequency response
(b) Absolute stability
(c) Relative stability
(d) Time response

Ans: c

17. Addition of zeros in transfer function causes which of the following ?
(a) Lead-compensation
(b) Lag-compensation
(c) Lead-lag compensation
(d) None of the above

Ans: b

18. technique is not applicable to nonlinear system ?
(a) Nyquist Criterion
(b) Quasi linearization
(c) Functional analysis
(d) Phase-plane representation

Ans: a

19. In order to increase the damping of a badly underdamped system which of following compensators may be used ?
(a) Phase-lead
(b) Phase-lag
(c) Both (a) and (b)
(d) Either (a) and (b)
(e) None of the above
Ans: a

20. The phase lag produced by transportation relays
(a) is independent of frequency
(b) is inverseh’proportional to frequency
(c) increases linearly with frequency
(d) decreases linearly with frequency

Ans: c