# Control Systems [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 19 - 21 of 81

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## Question 19

Control Systems

Appeared in Year: 2013 (UGC-NET)

### Question

Assertion-Reason▾

### Assertion(Ꭺ)

The part of root locus on the real axis is not dependent upon the poles and zeros which are not on the real axis.

### Reason(Ꭱ)

Poles and zeros which are not on the real axis always occur in conjugate pairs.

### Choices

Choice (4)Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

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

## Question 20

Appeared in Year: 2014 (UGC-NET)

### Question

Assertion-Reason▾

### Assertion(Ꭺ)

Routh Hurwitz criterion gives both absolute as well as relative stability using characteristic equation. (June)

### Reason(Ꭱ)

For a system to be stable all roots of characteristic equation must lie in left half of s-plane.

### Choices

Choice (4)Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

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

## Question 21

Appeared in Year: 2013 (UGC-NET)

### Question

MCQ▾

Routh՚s array for a system is given below: (September)

 1 3 5 1 2 9 1 5 -3 5

The system is

### Choices

Choice (4)Response

a.

Conditionally stable

b.

Stable

c.

Unstable

d.

Marginally stable

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