# GATE (Graduate Aptitude Test in Engineering) Electronics: Questions 692 - 698 of 1076

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### Passage

Consider a baseband binary PAM receiver shown below. The additive channel noise is with power spectral density . The low-pass filter is ideal with unity gain and cut-off frequency . Let represent the random variable .

, if transmitted bit

, if transmitted bit

Where, represents the noise sample value. The noise sample has a probability density function,

(This has mean zero and variance ) .

Assume transmitted bits to be equiprobable and threshold is set to .

## Question 692 (1 of 2 Based on Passage)

SNR and BER for Digital Modulation

Appeared in Year: 2010

### Question

MCQ▾

The probability of bit error is

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 693 (2 of 2 Based on Passage)

Appeared in Year: 2010

### Question

MCQ▾

The value of the parameter α (in ) is

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 694

Appeared in Year: 2019

### Question

MCQ▾

The dispersion equation of a waveguide, which relates the wave number k to the frequency , is

=

Where c is the speed of light ( m/sec) and is a constant. If the group velocity = m/sec then the phase velocity is

(Carry One Mark Each)

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 695

Amplitude Modulation and Demodulation

Appeared in Year: 2010

### Question

MCQ▾

The Nyquist sampling rate for the signal s (t) = is given by

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 696

Angle Modulation and Demodulation

Appeared in Year: 2010

### Question

MCQ▾

Consider an angle modulated signal . The average power of is

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 697

Appeared in Year: 2010

### Question

MCQ▾

In the silicon BJT circuit shown below, assume that the emitter area of transistor is half that of transistor .

The value of current I0 is approximately

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 698

Diffusion Current, Drift Current, Mobility and Resistivity

Appeared in Year: 2019

### Question

MCQ▾

In the circuits shown, the threshold voltage of each transistor is . Ignoring the effect of channel length modulation and body bias, the values of and , respectively, in volts, are (Carry One Mark Each)

### Choices

Choice (4)Response

a.

1.8 and 1.2

b.

2.4 and 1.2

c.

1.8 and 2.4

d.

2.4 and 2.4

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