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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 2
41.

Assertion (A): Positive feedback is not used in any circuit.

Reason (R): Positive feedback leads to instability.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
R is correct but A is wrong
Answer: Option
Explanation:

Positive feedback is used in oscillator circuits.

42.
For the equation where Q is heat energy Gt is thermal conductance and θ is temperature, analogous electrical equation is
i = G(v1 - v2)
Answer: Option
Explanation:

Temperatures θ1 and θ2 are analogous to voltage v1 and v2 .

43.
If the Nyquist plot does not encircle the (-1 + j0) point the system is always stable.
True
False
Answer: Option
Explanation:

It is not necessary.

44.
In op-amp circuit of the given figure, Eo(s)/Ei(s) =
Answer: Option
Explanation:

45.
A system hasFor unit step input the settling time for 2% tolerance band is
1.6
2.5
4
5
Answer: Option
Explanation:

ξωn - 0.8 and = 1.25 s. For 2% criterion, settling time = 4T = 5 seconds.

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