Control Systems mcq questions answers part4

Q1. The Damping ratio of a critical and undamped sustem is
(A) 1 and 0
(B) 0 and 1
(C) 1 and 1
(D) 0 and infinity

Q2. negative feedback in amplifier
(A) improves the siginal to noise ratio at the input
(B) improves the siginal to noise ratio at the output
(C) does not affect the siginal to noise ratio at output
(D) reduces distortion

Q3. with feedback the transient response of the system as compared to that without feedback
(A) decay slowly
(B) rise at faster rate
(C) rise at slow rate
(D) decays more quickly

Q4. break away point must be lie on.?
(A) real axis
(B) imaginary axis
(C) locus of roots
(D) left half of s-plane

Q5. for non minimum phase system
(A) PM and GM should be zero
(B) PM and GM both are positive
(C) PM and GM both are negative
(D) none of these

Q6. for minimum phase system
(A) PM and GM should be zero
(B) PM and GM both are positive
(C) PM and GM both are negative
(D) none of these

Q7. The temperature, under thermal and electrical system analogy, is considered analogous to
(A) voltage
(B) current
(C) capacitance
(D) charge

Q8. Adding of zeros in the transfer function causes
(A) Lag compensation
(B) Lead compensation
(C) Lead lag compensation
(D) Lag lead compensation

Q9. The transient response of a system is mainly due to
(A) inertia forces
(B) internal forces
(C) stored energy
(D) friction

Q10. The capacitance, in force-current analogy, is analogous to
(A) momentum
(B) velocity
(C) displacement
(D) mass

Q11. The on-off controller is a
(A) digital system
(B) linear system
(C) non-linear system
(D) discontinuous system

Q12. A controller can be considered as a
(A) sensor
(B) clipper
(C) comparator
(D) amplifier

Q13. In a control system the output of the controller is given to
(A) final control element
(B) amplifier
(C) comparator
(D) sensor

Q14. In a stable control system backlash can cause which of the following ?
(A) Underdamping
(B) Overdamping
(C) Poor stability at reduced values of open loop gain
(D) Low-level oscillations

Q15. Due to which of the following reasons excessive band width in control systems should be avoided ?
(A) It leads to slow speed of response
(B) It leads to low relative stability
(C) Noise is proportional to band width
(D) None of the above

Q16. Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?
(A) The system is relatively stable
(B) The system is highly stable
(C) The system is highly oscillatory
(D) None of the above

Q17. Which of the following statements is correct for any closed loop system ?
(A) All the co-efficient can have zero value
(B) All the co-efficient are always non-zero
(C) Only one of the static error co-efficient has a finite non-zero value
(D) None of the above

Q18. The current, in force-current analogy, is analogous to
(A) force
(B) velocity
(C) displacement
(D) mass

Q19. The magnetic flux linkage, in force-current analogy, is analogous to
(A) momentum
(B) velocity
(C) displacement
(D) mass

Q20. The voltage, in force-current analogy, is analogous to
(A) momentum
(B) velocity
(C) displacement
(D) mass