Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

Accurate amplitude measurements can be made more easily than accurate phase shift measurements.
A:
True
B:
False
C:
D:
Answer: A
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A motor is coupled to a load through gear ratio n. If T is the motor torque, Jm and JL are moment of inertia of rotor and load, then torque to inertia ratio referred to motor shaft is
A:
B:
C:
D:
Answer: C
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For overdamped systems a quadratic factor in transfer function can be replaced by two first order factors with real poles
A:
True
B:
False
C:
D:
Answer: A
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The signal flow graph of a system is shown in the given figure. The effect of disturbance TD can be reduced by
A:
increasing G2 (s)
B:
decreasing G2 (s)
C:
increasing G1 (s)
D:
decreasing G1 (s)
Answer: C

If G1(s) is increased, input is amplified more while disturbance remains the same.

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The gain margin for a stable system
A:
has a positive decibel value
B:
has a negative decibel value
C:
has a large negative decibel value
D:
none of the above
Answer: A

For a stable system gain margin is positive. Therefore decibel value is also positive.

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