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GATE 2019: Communication Quiz 7 (App update required to attempt this test)
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Question 1
A QPSK modulator has an input data rate of 90 Mbps and a carrier frequency 65 MHz. The minimum double sided Nyquist bandwidth is ________MHz.
Question 2
The bit rate of a digital communication system is 34M bits. The modulation scheme is QPSK. The baud rate of the system is
Question 3
The minimum step-size required for a Delta-Modulator operating at 32 K samples/sec to track the signal (here (u)t is the unit-step function)
x(t) = 125t(u(t)-u(t-1))+(250-125t)(u(t-1)-u(t-2))
So that slope-overload is avoided, would be
x(t) = 125t(u(t)-u(t-1))+(250-125t)(u(t-1)-u(t-2))
So that slope-overload is avoided, would be
Question 4
Consider minimum shift keying (MSK) also known as fast FSk with freq. spacing 2Fd between the state freq. Fb is the data rate.
Which one of the following correctly related Fb and Fd?
Which one of the following correctly related Fb and Fd?
Question 5
A block code is transmitted in NRZ format with voltage levels 3 V for logic ’1’ and -3V for logic ‘0’ respectively. If three code words are sent: 10010, 11110 and 01001, then over these three transmitted code words the average voltage is
Question 6
In a PCM system, the signal 
V is sampled at the Nyquist rate. The samples are processed by a uniform quantizer with step size 0.75 V. The minimum data rate of the PCM system in bits per second is _____.
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