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

Access detailed explanations (illustrated with images and videos) to **1076** questions. Access all new questions- tracking exam pattern and syllabus. View the complete topic-wise distribution of questions. *Unlimited Access, Unlimited Time, on Unlimited Devices*!

View Sample Explanation or View Features.

Rs. 450.00 -OR-

How to register? Already Subscribed?

### 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)

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

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

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 I_{0} is approximately

### Choices

Choice (4) | Response | |
---|---|---|

a. | ||

b. | ||

c. | ||

d. |

## Question 698

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 |