Communications [GATE (Graduate Aptitude Test in Engineering) Electronics & CE (EC)]: Questions 82 - 84 of 153

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Question 82

Appeared in Year: 2017

Question Numeric Answer▾

The un-modulated carrier in an AM transmitter is . This carrier is modulated by a sinusoidal modulating signal. The maximum percentage of modulation is . If it is reduced to , then the maximum unmodulated carrier power (in kW) that can be used without over loading the transmitter is …

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Question 83

Appeared in Year: 2015

Question Numeric Answer▾

A sinusoidal signal of amplitude A is quantized by a uniform quantizer Assume that the signal utilizes all the representation levels of the quantizer. If the signal to quantization noise ratio is 31.8 dB, the number of levels in the quantizer is …

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Question 84

Appeared in Year: 2019

Question Numeric Answer▾

A random variable takes values and with probabilities and , respectively. It is transmitted across a channel which adds noise , so that the random variable at the channel output is . The noise is independent of , and is uniformly distributed over the interval . The receiver decides

Where the threshold is chosen to minimize the probability of error . The minimum probability of error, rounded off to 1 decimal place, is ________.

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