Communications [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 67 - 70 of 106

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Question 67

Communications
Superheterodyne Receivers

Appeared in Year: 2014 (UGC-NET)

Question

MCQ▾

Which of the following are not the parts of an AM superheterodyne receiver? (December)

1. De-emphasis network

2. Mixer

3. IF Amplifier

4. Limiter

Choices

Choice (4)Response

a.

1 & 4

b.

2 & 4

c.

1 & 3

d.

1 & 2

Question 68

Communications
Amplitude Modulation and Demodulation

Appeared in Year: 2014 (UGC-NET)

Question

True-False▾

Statements

  1. DSB has two side bands and SSB has one (December)

  2. DSB has carrier and two side bands and SSB has a carrier and a side band

  3. DSB has carrier and two side bands and SSB without carrier and two different side bands.

Choices

Choice (4)Response

a.

Only statement Ⅲ is true.

b.

Only statement Ⅰ is true.

c.

Both statement Ⅰ & statement Ⅱ are true.

d.

Only statement Ⅱ is true.

Question 69

Communications
PCM, DPCM, Digital Modulation Schemes

Appeared in Year: 2015

Question

MCQ▾

A sinusoidal signal of frequency is applied to a delta modulator. The sampling rate and step-size Δ of the delta modulator are 20,000 samples per second and , respectively. To prevent slope overload, the maximum amplitude of the sinusoidal signal (in Volts) is

Choices

Choice (4)Response

a.

b.

c.

d.

π

Question 70

Communications
Amplitude Modulation and Demodulation

Appeared in Year: 2015

Question

MCQ▾

Consider the signal where denotes the Hilbert transform of m (t) and the bandwidth of is very small compared to . The signal is a

Choices

Choice (4)Response

a.

Band-pass signal

b.

Low-pass signal

c.

double sideband suppressed carrier signal

d.

High-pass signal

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