Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

For a second order system damping factor is 0.1. If ωd is frequency of damped oscillations and ωn is natural frequency, then
A:
ωd ≈ ωn
B:
C:
ωn ≈ ωn
D:
ωd ≈ (ωn)2
Answer: A

ωd = ωn(1 - 0.1)2 ⋍ ωn

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Given figure shows a unity feedback system. The ratio of time constants for open loop and closed loop response are
A:
1 : 1
B:
2 : 1
C:
3 : 2
D:
2 : 3
Answer: D

For open loop time constant = 0.25

For closed loop and time constant =

Hence ratio of time constants is 3 : 2.

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For the system of given figure the closed loop transfer function

A:
B:
C:
D:
Answer: D

or .

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Which of the following rotors are used in two phase ac servomotor?
  1. Solid iron rotor
  2. Squirrel cage rotor
  3. Drag cup rotor
Of the above the correct ones are
A:
1, 2, 3
B:
1, 2
C:
2, 3
D:
1, 3
Answer: C

Solid iron rotor would give rise to eddy currents.

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The effect of negative feedback on distortion and bandwidth because
A:
both are decreased
B:
both are increased
C:
distortion is reduced and bandwidth is increased
D:
distortion is increased and bandwidth is decreased
Answer: C

Negative feedback increase bandwidth and reduces distortion.

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