Test: Automatic Control Systems - 5

# Test: Automatic Control Systems - 5

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## 25 Questions MCQ Test | Test: Automatic Control Systems - 5

Test: Automatic Control Systems - 5 for Electrical Engineering (EE) 2022 is part of Electrical Engineering (EE) preparation. The Test: Automatic Control Systems - 5 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Automatic Control Systems - 5 MCQs are made for Electrical Engineering (EE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Automatic Control Systems - 5 below.
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Test: Automatic Control Systems - 5 - Question 1

### Examine the following statements Air and gases are compressible.Air, gases and some liquids are compressible.Oil can function as hydraulic fluid as well as lubricator. Which of the above statements are correct?

Test: Automatic Control Systems - 5 - Question 2

### Which control action is also called rate control?

Test: Automatic Control Systems - 5 - Question 3

### The signal flow graph of a system is shown in the given figure. The effect of disturbance TD can be reduced by

Detailed Solution for Test: Automatic Control Systems - 5 - Question 3

If G1(s) is increased, input is amplified more while disturbance remains the same.

Test: Automatic Control Systems - 5 - Question 4

The gain margin for a stable system

Detailed Solution for Test: Automatic Control Systems - 5 - Question 4

For a stable system gain margin is positive. Therefore decibel value is also positive.

Test: Automatic Control Systems - 5 - Question 5

For overdamped systems a quadratic factor in transfer function can be replaced by two first order factors with real poles

Test: Automatic Control Systems - 5 - Question 6

A motor is coupled to a load through gear ratio n. If T is the motor torque, Jm and JL are moment of inertia of rotor and load, then torque to inertia ratio referred to motor shaft is

Test: Automatic Control Systems - 5 - Question 7

Accurate amplitude measurements can be made more easily than accurate phase shift measurements.

Test: Automatic Control Systems - 5 - Question 8

A synchro transmitter receiver unit is a

Test: Automatic Control Systems - 5 - Question 9

The transfer function of transportation lag is

Test: Automatic Control Systems - 5 - Question 10

In the given figure the input frequency f = 0.1 (1/2 p RC)

Detailed Solution for Test: Automatic Control Systems - 5 - Question 10

XC = 10R. Hence V0 ⋍ Vi .

Test: Automatic Control Systems - 5 - Question 11

A lead compensator is basically a

Detailed Solution for Test: Automatic Control Systems - 5 - Question 11

See transfer function in the equation .

Test: Automatic Control Systems - 5 - Question 12

Assertion (A): The part of root locus on the real axis is not dependent on the poles and zeros which are not on the real axis.

Reason (R): Poles and zeros which are not on the real axis occur in conjugate pairs

Test: Automatic Control Systems - 5 - Question 13

In Bode diagram (log magnitude plot) of the factor 1/(1 + jωT) in the transfer function the log magnitude for ω << 1/T can be approximated by

Test: Automatic Control Systems - 5 - Question 14

For underdamped second order systems the rise time is the time required for the response to rise from

Test: Automatic Control Systems - 5 - Question 15

The phase angle of is constant and equal to - 90º for all values of ω

Test: Automatic Control Systems - 5 - Question 16

The open loop frequency response of a unity feed back system is as under

The gain margin and phase margin respectively are

Test: Automatic Control Systems - 5 - Question 17

Assertion (A): A large negative feedback is deliberately introduced in an amplifier to make its gain independent of variation in parameters of active device.

Reason (R): A large negative value of feedback results in a high value of return difference compared to unity which makes the feedback gain inversely proportional to the feedback factor.

Detailed Solution for Test: Automatic Control Systems - 5 - Question 17

Gain with feedback = .

Test: Automatic Control Systems - 5 - Question 18

An electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis is

Test: Automatic Control Systems - 5 - Question 19

The transfer function can be for

Detailed Solution for Test: Automatic Control Systems - 5 - Question 19

For a lead compensator and a < 1

Therefore is more than .

Test: Automatic Control Systems - 5 - Question 20

In response to a unit step input the controller output in given figure is for

Detailed Solution for Test: Automatic Control Systems - 5 - Question 20

The intercept on y-axis is due to proportional action and inclined line is due to integral action.

Test: Automatic Control Systems - 5 - Question 21

If then f(t) =

Test: Automatic Control Systems - 5 - Question 22

When time constant T in any factor is varied, the shapes of log magnitude and phase angle curves remain the same.

Test: Automatic Control Systems - 5 - Question 23

Which of the following is not correct for two phase servomotor?

Detailed Solution for Test: Automatic Control Systems - 5 - Question 23

In this motor ratio is small or R is high.

Test: Automatic Control Systems - 5 - Question 24

Given figure shows the magnitude plot for a system. The steady state error for unit step input is

Test: Automatic Control Systems - 5 - Question 25

DC servomotors are, generally

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