Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

For any transfer function, the constant phase angle loci are
A:
a family of circles
B:
a family of straight lines
C:
either (a) or (b)
D:
neither (a) nor (b)
Answer: A
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The permanent magnet field system of brushless dc servo- motor is generally on
A:
stator
B:
rotor
C:
partly on stator and partly on rotor
D:
either (a) or (b)
Answer: B
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A unity feedback system has the following open loop frequency response

The gain margin and phase margin are
A:
0 dB, -17°
B:
3.86 dB, -180°
C:
0 dB, 10°
D:
3.86 dB, 10°
Answer: D
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A system has two poles as shown in the given figure. The zeros are at infinity. If input is unit step, the steady state output is
A:
B:
C:
D:
1
Answer: D
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At corner frequency the phase angle of factor is - 45°
A:
True
B:
False
C:
D:
Answer: A
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