Test: Communication-1 - Electrical Engineering (EE) MCQ

Quadrature multiplexing uses

Saving in power in DSB-SC system modulated at 80% is (in comparison with AM)

An amplifier has a power gain of 200. What is its gain in dB (log 10² = 0.3)

A DSB-SC signal is generated using the carrier cos (wct  ) and modulating signal x(t). The envelope of DSB -SC signal is

The waveform A cos (w₁t + k cos w₂t) is

The typical squelch circuit

In FM radio broadcasting system, the maximum frequency deviation is usually

An FM signal with modulation index mf is passed through a frequency tripler, the modulation index of output signal will be

An angle modulated signal is expressed by Fa(t)= cos (2 × 10⁸ t + 75 sin 2 × 10³ t). The peak frequency deviation of carrier is the

If we add the amplitude modulated signal and narrow band FM signal with same modulation index, than resultant signal will be

Which of the following modulation are used for telecasting TV programme

1. AM

2. FM

3. Pulse modulation

4. Phase modulation

Band width requirement for commercial FM radio broad cast is

In PCM system if the quantisation level are increased from 2 to 8, the relative bandwidth will be

The signal to quantisation noise ratio in an n-bit PCM system

In a delta modulation scheme, the step height is 75 mV and step size is 1.5 ms. The maximum slope that the staircase can track is

Quantisation noise occurs in

In case a signal band limited to fm is sampled at a rate less than 2fm, the constructed signal will be

In PCM if transmission path is very long

In a delta modulation system, granular noise occurs when the

Compander is used for

For 10 bit PCM system, the signal to quantiration noise ratio is 62 dB. If the number of bits are increased by 2, then signal to noise ratio will