DMRC Electronics Engineering Paper-1 2016

Instructions

For the following questions answer them individually

Question 51

The analog signal m(t) is given below m(t) = 4 cos 100 pt + 8 sin 200 pt + cos 300 pt, the Nyquist sampling rate will be:

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Question 52

Find the noise factor for an antenna at $$27^\circ$$ C with equivalent noise temperature $$30^\circ$$ K:

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Question 53

Inverse Laplace transform of $$\frac{2s + s}{(s + 3)(S + 2)}$$ is:

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Question 54

The analog signal given below is sampled by 600 samples per second for m(t) = 3 sin 500 pt + 2 sin 700 pt then folding frequency is:

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Question 55

Which one most appropriate dynamic system?

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Question 56

In which of these is reverse recovery time nearly zero?

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Question 57

Frequency shift keying is used mostly in:

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Question 58

A parallel polarized wave is incident from air into paraffin having relative permittivity 3, the value of its Brewster angle is:

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Question 59

The phase angle corresponding to $$\frac{\lambda}{4}$$ in a standing - wave pattern is:

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Question 60

A 10 km long line has a characteristic impedance of 400 ohms. If line length is 100 km, the characteristic impedance is:

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