Exam Details
2023 Electronics and Telecommunication Engineering
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Questions
150
Duration
180 mins
Package
Indian Economic Service and Indian Statistical Service Examination - Previous Year Papers
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150questions
Easy
50
33.3%
Medium
50
33.3%
Hard
50
33.3%
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150questions
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Sample questions from this paper
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2023 · Unclassified
2023 Electronics and Telecommunication Engineering
The power transmitted by an SSB transmitter is 20 kW. It is required to be replaced by standard AM transmission having modulation index of 0·4 and same power. What is the transmission efficiency?
2023 · Unclassified
2023 Electronics and Telecommunication Engineering
An angle modulated signal is given as x_c(t) = 20cos \left[ 200\pi t + \pi/4 \right]. What is the instantaneous frequency?
2023 · Unclassified
2023 Electronics and Telecommunication Engineering
An FM modulator operates at carrier frequency of 250 kHz with frequency deviation sensitivity of 1·5 kHz/V. A PM modulator operates at carrier frequency of 500 kHz with phase deviation sensitivity of 1·5 rad/V. If both FM and PM modulators are modulated by the same modulating signal having peak amplitude of 5 V and modulating frequency of 5 kHz, then what is the relationship between frequency modulation index and phase modulation index?
2023 · Unclassified
2023 Electronics and Telecommunication Engineering
What is the relationship between the percentage efficiency saving when the carrier wave and one of the sidebands are suppressed in an AM wave modulated to a depth of 100% modulation index?
2023 · Unclassified
2023 Electronics and Telecommunication Engineering
An audio signal s(t) = 5cos(2000πt) is quantized using 10-bit PCM. What is the signal-to-quantization noise ratio?
2023 · Unclassified
2023 Electronics and Telecommunication Engineering
An FM audio signal with single-tone modulation has a frequency deviation of 25 kHz and a bandwidth of 75 kHz. What is the frequency of the modulating signal using Carson's rule?