Control Systems-Frequency Response [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 1 - 3 of 7

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Passage

Sensitivity considerations often are important in the design of Control Systems. Because all physical elements have properties that change with environment and age, we cannot always consider the parameters of the Control System to be completely stationary over the entire operating life of system. For instance, the winding resistance of an electric motor changes as the temperature of the motor rises during the operation. Control System with electric components may not operate normally when first turned on because of the still-changing system during warm-up. This phenomenon is sometimes called “morning sickness” . Most duplicating machines have a warm-up period during which time operation is blocked out when first turned on.

(July)

Question 1 (1 of 1 Based on Passage)

Appeared in Year: 2018

Question MCQ▾

Which of the following statements is correct?

Choices

Choice (4)Response

a.

A feedback can increase or decrease the sensitivity of a system.

b.

A feedback can only decrease the sensitivity of the system.

c.

A feedback can only increase the sensitivity of the system.

d.

A feedback never affects the sensitivity of a system.

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Question 2

Appeared in Year: 2018

Question Assertion-Reason▾

Assertion(Ꭺ)

A necessary and sufficient condition for a feedback system to be stable is that all the poles of the system transfer function have negative real parts. (December)

Reason(Ꭱ)

To obtain a bounded response, the poles of the closed loop system must be in the left half portion of the splan.

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is false but Ꭱ is true

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Question 3

Appeared in Year: 2013

Question Assertion-Reason▾

Assertion(Ꭺ)

An LTI discrete system represented by the difference equation is unstable. (June)

Reason(Ꭱ)

A system is unstable if the roots of the characteristic equation lie outside the unit circle.

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

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