CONTROL SYSTEM SET 08

CONTROL SYSTEM SET 08

1. 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
 
2. 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
 
3. In case of type-1 system steady state acceleration is
(a) Unity
(b) infinity
(c) zero
(d) 10
 
Ans: b
 
4. 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
 
5. 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
 
6. 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
 
7. 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
 
8. ___ technique is not applicable to nonlinear system?
(a) Nyquist Criterion
(b) Quasi linearization
(c) Functional analysis
(d) Phase-plane representation
 
Ans: a
 
9. 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
 
10. 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