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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 2
36.
For an RLC series circuit Z(s) is of the form
Answer: Option
Explanation:

.

37.
If feedback factor is β the overall gain of a closed loop system is approximately equal to
β
β
Answer: Option
Explanation:

Closed loop gain = . Since 1 << Av β, the gain is .

38.
The functions and have
identical magnitude and phase curves
identical magnitude curves but different phase curves
different magnitude curves but identical phase curves
different magnitude and phase curves
Answer: Option
Explanation:

Magnitude are the same. i.e. .

However phase angles are different because the phase angle of 1 - jωT3 is negative but that of 1 - jωT3 is positive.

39.
For the op-amp circuit of the given figure, Eo(s)/Ei(s) =
Answer: Option
Explanation:

40.
A unity feedback system has open loop transfer function The closed loop transfer function is
Answer: Option
Explanation:

.

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