1

GATE ECE 2013

MCQ (Single Correct Answer)

+1

-0.3

The bit rate of a digital communication system is R kbits/s. The modulation used is 32-QAM. The minimum bandwidth required for ISI free transmission is

2

GATE ECE 2004

MCQ (Single Correct Answer)

+1

-0.3

In a PCM system, if the code word length is increased from 6 to 8 bits, the signal to quantization noise ratio improves by the factor

3

GATE ECE 2004

MCQ (Single Correct Answer)

+1

-0.3

In the output of a DM speech encoder, the consecutive pulses are of opposite polarity during time interval t

_{1}$$ \le $$ t $$ \le $$ t_{2}. This indicates that during this interval4

GATE ECE 2002

MCQ (Single Correct Answer)

+1

-0.3

For a bit-rate of 8 kbps, the best possible values of the transmitted frequencies in a coherent binary

**FSK**system areQuestions Asked from Digital Communication Systems (Marks 1)

Number in Brackets after Paper Indicates No. of Questions

GATE ECE Subjects

Signals and Systems

Representation of Continuous Time Signal Fourier Series Fourier Transform Continuous Time Signal Laplace Transform Discrete Time Signal Fourier Series Fourier Transform Discrete Fourier Transform and Fast Fourier Transform Discrete Time Signal Z Transform Continuous Time Linear Invariant System Discrete Time Linear Time Invariant Systems Transmission of Signal Through Continuous Time LTI Systems Sampling Transmission of Signal Through Discrete Time Lti Systems Miscellaneous

Network Theory

Control Systems

Digital Circuits

General Aptitude

Electronic Devices and VLSI

Analog Circuits

Engineering Mathematics

Microprocessors

Communications

Electromagnetics