Online Electronics and Communication Engineering Test - Automatic Control Systems Test



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Instruction:

  • This is a FREE online test. DO NOT pay money to anyone to attend this test.
  • Total number of questions : 20.
  • Time alloted : 30 minutes.
  • Each question carry 1 mark, no negative marks.
  • DO NOT refresh the page.
  • All the best :-).


1.

For the system in the given figure. The transfer function C(s)/R(s) is

A.
G1 + G2 + 1
B.
G1 G2 + 1
C.
G1 G2 + G2 + 1
D.
G1 G2 + G1 + 1

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

Transfer function = (G1 + 1) G2 + 1 = G1 G2 + G2 + 1.

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2.

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

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

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

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3.

In the given figure the input is x(t) = A sin ωt. The steady state output y(t) =

A.
A sin (ωt + φ) where φ = tan-1 |G(jω)|
B.
|G(jω)| A sin [ωt + ∠G(jω)]
C.
|G(jω)| A sin [2ωt + ∠G(jω)]
D.
A G(jω) sin [ωt + ∠G(jω)]

Your Answer: Option (Not Answered)

Correct Answer: Option B

Explanation:

The magnitudes A and G(jω) are multiplied and phase angles are added.

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4.

For the given figure,

A.
B.
C.
D.

Your Answer: Option (Not Answered)

Correct Answer: Option B

Explanation:

For the inner loop, transfer function =

Then .

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5.

The maximum shift which can be provided by a lead compensator with transfer function is

A.
15°
B.
30°
C.
45°
D.
60°

Your Answer: Option (Not Answered)

Correct Answer: Option B

Explanation:

The maximum phase lead is given by

In this case a = 1/3. Hence sin Φm = = 0.5 or Φm = 30°.

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6.

The polar plot of

A.
does not cross real axis
B.
crosses real axis
C.
crosses real axis at ω = 0.7 rad/sec
D.
crosses real axis at ω = 1.4 rad/sec

Your Answer: Option (Not Answered)

Correct Answer: Option A

Explanation:

It does not become real at any frequency.

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7.

A lead compensator is basically a

A.
high pass filter
B.
low pass filter
C.
band stop filter
D.
none of the above

Your Answer: Option (Not Answered)

Correct Answer: Option A

Explanation:

See transfer function in the equation .

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8.

For the system of the given figure, the break away and break in points are determined from the conditions . Then K =

A.
B.
C.
D.

Your Answer: Option (Not Answered)

Correct Answer: Option B

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9.

Assertion (A): For a given system only one of the static error constants is finite and significant.

Reason (R): If finite static error constant is large, the loop gain becomes smaller as ω approaches zero.

A.
Both A and R are correct and R is correct explanation of A
B.
Both A and R are correct but R is not correct explanation of A
C.
A is correct but R is wrong
D.
R is correct but A is wrong

Your Answer: Option (Not Answered)

Correct Answer: Option C

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10.

If ΔP is pressure difference, A is area of each flat surface, K is stiffness and Δx is displacement of movable surface from reference of bellows, then

A.
B.
C.
D.

Your Answer: Option (Not Answered)

Correct Answer: Option C

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11.

In a mechanical accelerometer, the steady state displacement is a measure of

A.
constant input acceleration
B.
constant input velocity
C.
either (a) or (b)
D.
neither (a) nor (b)

Your Answer: Option (Not Answered)

Correct Answer: Option A

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12.

In a synchro transmitter

A.
input is angular position of rotor shaft and output is stator voltages
B.
input is stator voltages and output is angular position of shaft input is rotor voltage and output is angular position of rotor shaft
C.
input is rotor voltage and output is angular position of rotor shaft
D.
input is angular position of rotor shaft and output is rotor voltage

Your Answer: Option (Not Answered)

Correct Answer: Option A

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13.

If block diagrams of the given figure (a) and (b) are to be equivalent, then

A.
G2 = G1
B.
G2 = -G1
C.
D.

Your Answer: Option (Not Answered)

Correct Answer: Option A

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14.

In control systems the word controller includes

A.
error detector and feedback element
B.
feedback element and control elements
C.
error detector and control elements
D.
error detector, control elements and feedback elements

Your Answer: Option (Not Answered)

Correct Answer: Option C

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15.

If damping ratio is 0.5, the lines joining complex poles with origin are inclined to negative real axis at

A.
± 90°
B.
± 60°
C.
± 45°
D.
± 30°

Your Answer: Option (Not Answered)

Correct Answer: Option B

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16.

Assertion (A): If points at infinity are included, G(s) has same number of poles and zeros.

Reason (R): The function has a zero at s = - 2.

A.
Both A and R are correct and R is correct explanation of A
B.
Both A and R are correct but R is not correct explanation of A
C.
A is correct but R is wrong
D.
R is correct but A is wrong

Your Answer: Option (Not Answered)

Correct Answer: Option B

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17.

Integral control action

A.
removes offset
B.
may lead to oscillatory response
C.
both (a) and (b)
D.
neither (a) nor (b)

Your Answer: Option (Not Answered)

Correct Answer: Option C

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18.

Nyquist stability criterion uses open loop frequency response characteristics.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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19.

Which of the following can act as error detecting devices

  1. a pair of potentiometers
  2. a pair of synchros
  3. a differential transformer
  4. a metadyne
  5. a control transformer
Select the answer using the following codes:

A.
1, 2, 5
B.
2, 3, 4, 5
C.
1, 3, 4, 5
D.
1, 2, 3, 4

Your Answer: Option (Not Answered)

Correct Answer: Option A

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20.

A conditionally stable system is stable for the value of gain between two critical values. It is unstable if

A.
the gain is increased beyond upper critical value
B.
the gain is decreased below lower critical value
C.
both (a) and (b)
D.
none of the above

Your Answer: Option (Not Answered)

Correct Answer: Option C

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