# Electromagnetics [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 17 - 21 of 96

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## Question 17

Electromagnetics
Gain and Directivity

Appeared in Year: 2013 (UGC-NET)

### Question

MCQ▾

VSWR (Voltage Standing Wave Ratio) is always (June)

### Choices

Choice (4)Response

a.

1

b.

More than 1

c.

0.4

d.

Less than 1

## Question 18

Electromagnetics
Differential and Integral Forms and Their Interpretation

Appeared in Year: 2013 (UGC-NET)

### Question

Match List-Ⅰ List-Ⅱ▾

Match the following lists: (June)

List-Ⅰ (Column-I)List-Ⅱ (Column-II)
(A)

Ampere՚s Law

(i)

∇ × E¯ = ∂ B¯- ∂ t

(B)

Continuity equation

(ii)

(C)

(iii)

(D)

Gauss՚s Law

(iv)

### Choices

Choice (4)Response
• (A)
• (B)
• (C)
• (D)

a.

• (iii)
• (ii)
• (i)
• (iv)

b.

• (ii)
• (iv)
• (i)
• (iii)

c.

• (ii)
• (iii)
• (i)
• (iv)

d.

• (i)
• (ii)
• (iii)
• (iv)

## Question 19

Electromagnetics
Gain and Directivity

Appeared in Year: 2013 (UGC-NET)

### Question

MCQ▾

Which antenna gets circularly polarized? (June)

### Choices

Choice (4)Response

a.

Helical

b.

Yagi-Uda

c.

Parabolic

d.

Dipole

## Question 20

Electromagnetics
Characteristic Impedance

Appeared in Year: 2013 (UGC-NET)

### Question

Assertion-Reason▾

### Assertion(Ꭺ)

TEM waves exist in a waveguide. (June)

### Reason(Ꭱ)

Phase velocity and wave impedance for TEM waves are independent of the frequency of the waves.

### Choices

Choice (4)Response

a.

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

b.

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

c.

Ꭺ is false but Ꭱ is true

d.

Ꭺ is true but Ꭱ is false

## Question 21

Electromagnetics
Gain and Directivity

Appeared in Year: 2013 (UGC-NET)

### Question

MCQ▾

Consider the following statements regarding a semiconductor:

1. Acceptor level lies close to the valence band.

2. Donor level close to the valence band.

3. n-type semiconductor behaves as a conductor at zero Kelvin.

4. p-type semiconductor behaves as a insulator at zero Kelvin.

### Choices

Choice (4)Response

a.

2 & 3 are correct.

b.

1 & 3 are correct.

c.

1 & 4 are correct.

d.

3 & 4 are correct.

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