Online Electronics and Communication Engineering Test - Automatic Control Systems Test

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Total number of questions: 20.
Time allotted: 30 minutes.
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For the system in the given figure. The transfer function C(s)/R(s) is

G₁ + G₂ + 1

G₁ G₂ + 1

G₁ G₂ + G₂ + 1

G₁ G₂ + G₁ + 1

[#]

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

A sin (ωt + φ) where φ = tan^-1 |G(jω)|

|G(jω)| A sin [ωt + ∠G(jω)]

|G(jω)| A sin [2ωt + ∠G(jω)]

A G(jω) sin [ωt + ∠G(jω)]

[#]

First column elements of Routh's tabulation are 3, 5,

, 2. It means that there

is one root in left half s plane

are two roots in left half s plane

are two roots in right half s plane

is one root in right half s plane

[#]

For the given figure,

[#]

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

15°

30°

45°

60°

[#]

The polar plot of

does not cross real axis

crosses real axis

crosses real axis at ω = 0.7 rad/sec

crosses real axis at ω = 1.4 rad/sec

[#]

A lead compensator is basically a

high pass filter

low pass filter

band stop filter

none of the above

[#]

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

. Then K =

[#]

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.

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

[#]

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

[#]

11.

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

constant input acceleration

constant input velocity

either (a) or (b)

neither (a) nor (b)

[#]

12.

In a synchro transmitter

input is angular position of rotor shaft and output is stator voltages

input is stator voltages and output is angular position of shaft input is rotor voltage and output is angular position of rotor shaft

input is rotor voltage and output is angular position of rotor shaft

input is angular position of rotor shaft and output is rotor voltage

[#]

13.

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

G₂ = G₁

G₂ = -G₁

[#]

14.

In control systems the word controller includes

error detector and feedback element

feedback element and control elements

error detector and control elements

error detector, control elements and feedback elements

[#]

15.

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

± 90°

± 60°

± 45°

± 30°

[#]

16.

Integral control action

removes offset

may lead to oscillatory response

both (a) and (b)

neither (a) nor (b)

[#]

17.

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

the gain is increased beyond upper critical value

the gain is decreased below lower critical value

both (a) and (b)

none of the above

[#]

18.

Which of the following can act as error detecting devices

a pair of potentiometers
a pair of synchros
a differential transformer
a metadyne
a control transformer

Select the answer using the following codes:

1, 2, 5

2, 3, 4, 5

1, 3, 4, 5

1, 2, 3, 4

[#]

19.

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.

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

[#]

20.

Nyquist stability criterion uses open loop frequency response characteristics.

True

False

[#]

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