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ESE 2019 Technical ( Analog & Digital Communication Systems: Quiz 2 )

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Question 1

In VCO graph shown, which symbol represents non-monotonic region?

Question 2

Phase locked loop diagram as shown, the error signal is passed by which component?

Question 3

An FM broadcasting radio station transmits signals of frequency 100 MHz with a power of 10 kW. The bandwidth of the modulation signal is from 100 Hz to 1.5 kHz. If the maximum deviation set by FCC, (δ), is 75 kHz, the range of the modulation index is :

Question 4

When the modulating frequency is doubled, the modulation index is halved, and the modulating voltage remains constant. The modulation system is
1) Amplitude modulation
2) Phase modulation
3) Frequency modulation
Select the correct answer from the codes given below:

Question 5

A sinusoidal audio signal is given by It modulates a sinusoidal carrier wave The value of amplitude modulation index must be

Question 6

Assertion (A): AN eight-bit PCM system performs better than a six-bit PCM system.
Reason (R): Eight-bit system produces smaller quantization noise than a six-bit system.

Question 7

Figure shown a block diagram of a system to recover a sampled signal shown as input.

Blocks A and B can be respectively

Question 8

Speech is put inside a TV channel as FM signal. If maximum allowed frequency deviation is 25 kHz and maximum modulating frequency is 15 kHz, then bandwidth of output FM signal will be:

Question 9

The technique in which, the digital data modulates the frequency of the carrier, is:

Question 10

Match List-I (Application of Signals) with List-II (Definition) and select the correct answer using the code given below the lists:
List-I
A). Reconstruction
B). Over sampling
C). Interpolation
D). Decimation
List-II
1). Sampling rate is chosen significantly greater than Nyquist rate
2). A mixture of continuous and discrete time signals
3). To convert the discrete time sequence back to a continuous time signal and then resample
4). Assign values between samples and signals
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Jun 10ESE & GATE EC