Automatic Control Systems MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Automatic Control Systems, a fundamental topic in the field of Electronics and Communication Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Automatic Control Systems MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Automatic Control Systems mcq questions that explore various aspects of Automatic Control Systems problems. Each MCQ is crafted to challenge your understanding of Automatic Control Systems principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Electronics and Communication Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Automatic Control Systems MCQs are your pathway to success in mastering this essential Electronics and Communication Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Automatic Control Systems. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Automatic Control Systems knowledge to the test? Let's get started with our carefully curated MCQs!

Automatic Control Systems MCQs | Page 8 of 48

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Q71.
In Bode diagram (log magnitude plot) the factor (jฯ‰)^n in the transfer function gives a line having slope

a.

20 dB/decade

b.

20n dB/decade

c.

20/n dB/decade

d.

-20n dB/decade

Discuss
Answer: (b).20n dB/decade
Q72.
The magnitude of transport lag factor is always zero.

a.

True

b.

False

c.

May be True or False

d.

can't say

Discuss
Answer: (b).False
Q73.
If G(s) H(s) = 1/(s²+100), the closed loop poles are on

a.

negative real axis

b.

jฯ‰ axis

c.

right half plane

d.

either (a) or (b)

Discuss
Answer: (b).jฯ‰ axis
Q74.
A system has 12 poles and 2 zeros. Its high frequency asymptote in its magnitude plot has a slope of

a.

-200 dB/decade

b.

-240 dB/decade

c.

-280 dB/decade

d.

-320 dB/decade

Discuss
Answer: (a).-200 dB/decade
Q75.
The open loop transfer function of a unity feedback system is G(s) = 1/(s+2)². The poles of closed loop system are at

a.

-2, -2

b.

-2, -1

c.

- 2, ± j 1

d.

- 2, 2

Discuss
Answer: (c).- 2, ± j 1
Q76.
If G(jฯ‰) = 1/(1+(jฯ‰T) the polar plot, as the frequency is varied from 0 to infinity is

a.

a semicircle

b.

a circle

c.

a straight line

d.

none of the above

Discuss
Answer: (a).a semicircle
Q77.
Lag compensation increases bandwidth of the system.

a.

True

b.

False

c.

May be True or False

d.

can't say

Discuss
Answer: (b).False
Q78.
The effect of negative feedback on distortion and bandwidth because

a.

both are decreased

b.

both are increased

c.

distortion is reduced and bandwidth is increased

d.

distortion is increased and bandwidth is decreased

Discuss
Answer: (c).distortion is reduced and bandwidth is increased
Q79.
Which of the following rotors are used in two phase ac servomotor?

1. Solid iron rotor
2. Squirrel cage rotor
3. Drag cup rotor

Of the above the correct ones are

a.

1, 2, 3

b.

1, 2

c.

2, 3

d.

1, 3

Discuss
Answer: (c).2, 3
Q80.
In a second order system with a unit step input, the speed of response is high if system is

a.

overdamped

b.

undamped system

c.

critically damped

d.

underdamped

Discuss
Answer: (d).underdamped
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