Electronics and Communication Engineering
2017 · Paper 2
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE ECE 2017 Paper 2 overview, original pages and practice · Timed previous-paper practice
Questions 49–51 of 65. Imported answers require review unless explicitly marked reviewed.
Question 49
Open questionECMCQ2 marksNeeds review
The signal
, where
is in seconds, is sampled at a rate of 9000 samples per second. The sampled signal is the input to an ideal lowpass filter with frequency response
as follows:
What is the number of sinusoids in the output and their frequencies in kHz?
Your answerChoose one option.
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Open questionECNAT2 marksNeeds review
The unmodulated carrier power in an AM transmitter is 5 kW. This carrier is modulated by a sinusoidal modulating signal. The maximum percentage of modulation is 50%. If it is reduced to 40%, then the maximum unmodulated carrier power (in kW) that can be used without overloading the transmitter is __________
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Open questionECNAT2 marksNeeds review
A modulating signal given by
V is fed to a phase modulator with phase deviation constant
rad/V. If the carrier frequency is 20 kHz, the instantaneous frequency (in kHz) at
ms is __________Log in to check the answer
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