Q1. If one of the poles lies in the left half s plane, the system is
(A) stable
(B) unstable
(C) marginary stable
(D) Cannot say
Answer: Cannot say
Explanation:
Q2. If one of the poles lies in the right half s plane, the system is
(A) stable
(B) unstable
(C) marginary stable
(D) None of these
Answer: unstable
Explanation:
Q3. In an open loop control system
(A) Output is independent of control input
(B) Output is dependent on control input
(C) Only system parameters have effect on the control output
(D) none of these
Answer: Output is independent of control input
Explanation:
Q4. TF of a system is used to calculate
(A) steady state gain
(B) time constant
(C) order of system
(D) output for given input
Answer: steady state gain
Explanation:
Q5. For a stabile system, poles must lie in
(A) right half of s-plane
(B) left half of s- plane
(C) on imaginary axis
(D) None of these
Answer: left half of s- plane
Explanation:
Q6. nyquist plot of all pass filter is
(A) parabola
(B) circle
(C) square
(D) not define
Answer: circle
Explanation:
Q7. which system is more accurate
(A) open loop
(B) closed loop
(C) both
(D) None of these
Answer: closed loop
Explanation:
Q8. which one is more stable
(A) open loop system
(B) close loop system
(C) both
(D) None of these
Answer: open loop system
Explanation:
Q9. for stable system
(A) pm and GM both are negative
(B) PM and GM both are positive
(C) PM is positive and GM is negative
(D) PM is negative and GM is positive
Answer: PM and GM both are positive
Explanation:
Q10. if Gain cross over frequency(Wgc) < phase cross over frequency(Wpc) then system is
(A) stable
(B) unstable
(C) marginary stable
(D) None of these
Answer: stable
Explanation:
Q11. if Gain cross over frequency(Wgc) =phase cross over frequency(Wpc) then system is
(A) stable
(B) unstable
(C) marginary stable
(D) None of these
Answer: marginary stable
Explanation:
Q12. if Gain cross over frequency(Wgc) > phase cross over frequency(Wpc) then system is
(A) stable
(B) unstable
(C) both a and b
(D) None of these
Answer: unstable
Explanation: The majority of control system designs behave similarly with regard to stability. Most often, if the gain exceeds a certain critical point, the system loses stability. Gain margin and phase margin both measure a system’s stability margin. The gain and phase margin are two metrics to tell you how close the system is to oscillation (instability). Gain Margin : It is the gain which can be varied before the system becomes just stable(i.e, after varying the gain up to a certain threshold, the system becomes marginally stable and then further variation of gain leads to unstability). Gain Margin occurs at phase cross over frequency(phase cross over frequency is the frequency at which the phase angle G(s)H(s) -180 degrees) Phase margin:It is the phase that can be varied before the system becomes just stable(i.e, after varying the phase up to a certain threshold, the system becomes marginally stable and then further variation of phase leads to unstability). Phase margin occurs at Gain Cross over frequency(Gain cross over frequency is the frequency at which the magnitude of the G(s)H(s) becomes 1)
Q13. if damping ratio is greater then one then system is
(A) underdamped
(B) undamped
(C) overdamped
(D) critically damped
Answer: overdamped
Explanation:
Q14. if damping ratio is one then system is
(A) undamped
(B) underdamped
(C) critically damped
(D) over damped
Answer: critically damped
Explanation:
Q15. damping ratio is between 0 and 1 then system is
(A) undamped
(B) underdamped
(C) critical damped
(D) over damped
Answer: underdamped
Explanation: The damping of a system can be described as being one of the following: Overdamped The system returns (exponentially decays) to equilibrium without oscillating. Critically damped The system returns to equilibrium as quickly as possible without oscillating. Underdamped The system oscillates (at reduced frequency compared to the undamped case) with the amplitude gradually decreasing to zero. Undamped The system oscillates at its natural resonant frequency without experiencing decay of its amplitude.
Q16. The first order control system has a
(A) small bandwidth
(B) negative time constant
(C) large negative transfer function pole
(D) Double Poles at origing
Answer: large negative transfer function pole
Explanation:
Q17. Which of the following device converts temperature into voltage?
(A) Thermocouple
(B) Potentiometer
(C) Wheaton’s bridge
(D) LVDT
Answer: Thermocouple
Explanation:
Q18. Which of the following can be measured using LVDT?
(A) Displacement
(B) Velocity
(C) Acceleration
(D) All of these
Answer: All of these
Explanation:
Q19. If the gain of the critical damped system is increased it will behave as
(A) oscillatory
(B) critically damped
(C) overdamped
(D) underdamped
Answer: underdamped
Explanation:
Q20. A phase lag lead network introduces in the output
(A) lag at all frequencies
(B) lag at high frequencies and lead at low frequencies
(C) lag at low frequencies and lead at high frequencies
(D) none of these
Answer: lag at low frequencies and lead at high frequencies
Explanation:
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