Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

First column elements of Routh's tabulation are 3, 5, , 2. It means that there
A:
is one root in left half s plane
B:
are two roots in left half s plane
C:
are two roots in right half s plane
D:
is one root in right half s plane
Answer: C

Since there are two sign changes in the first column, hence two roots in right half plane.

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From the noise point of view, bandwidth should
A:
be large
B:
not be too large
C:
should be as large as possible
D:
should be infinite
Answer: B

If noise is to be eliminated, bandwidth cannot be large.

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In the given figure, the input frequency is such that R = XC. Then
A:
v0 lags vi by 45°
B:
v0 lags vi by 90°
C:
v0 leads vi by 45°
D:
v0 leads vi by 90°
Answer: A

R = XC, voltage drops across R and XC are equal and at 90° with respect by each other. V0 lags Vi by 45°.

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In a two phase ac servomotor rotor resistance is R and rotor reactance is X. The speed curve will be linear if
A:
B:
C:
D:
X2 = R
Answer: A

In a two phase servomotor ∠ < 1 so that torque speed curve is almost linear.

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For the given figure C(s)/R(s)
A:
B:
C:
D:
Answer: B

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