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GATE 2021: Toppers Quiz-9 (App update required to attempt this test)

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Question 1

In the given circuit, the race around condition

Question 2

The transfer function of the lead compensator And, If the lead compensator need to provide a maximum phase lead of 40° at a frequency of 5 rad/s, then the value of T is around_____.

Question 3

Consider the following statements

A clamper circuit

1) Adds or subtracts a dc voltage to or from a waveform

2) Does not change the shape of the waveform

3) Amplifier the waveform of these statements

Which of the above statements are correct?

Question 4

An AM signal is given by s(t) = [8 + 4 cos(8000t) + 2 cos(4500t)] cos2πFct then modulation efficiency of the wave is _____ %.

Question 5

Consider an AWGN channel with 4kHz bandwidth and the two sided noise PSD 10-12W/Hz. The signal power required at receiver is 0.1mw calculate the channel capacity.

Question 6

For a particular semiconductor material, following parameters observed
μn = 1000 cm2/Vs
μp = 600 cm2/Vs
NC = NV = 1019 cm-3

These parameters are independent of temperature. The measured conductivity of the intrinsic material is σ = 10-6 Ω-1cm-1 at T = 300K
The resistivity at T = 500 K is

Question 7

The plane wave with

A lossless medium (εr = 4, μr = 1) encounters free space at z = 0.  The reflected electric field is

Question 8

The BJT’s in the Darlington follower of figure have β = 100. If the follower is fed with a source having a 100 kΩ resistance and is loaded with 1 kΩ, the input resistance is

Question 9

Consider a system shown in figure the value of K and Kn so that maximum overshoot in the unit step response, is 0.2 and the peak time is 1 second.

Question 10

A sample of Ge has n-type impurity concentration of 2 × 1014/cm3 and p type impurity concentration of 3 × 1014/cm3. Calculate n and P (in /cm3).

Question 11

If the given OP-Amp is ideal the resistance seen by load is given as:

Question 12

If the function W, X, Y and Z are as

Then

Question 13

Power spectral density of message in given by, Sm(ω) = P rect (ω/2α), α = 8000 π,

The noise has PSD; Sn(ω) = 10–8

If the minimum output SNR at receiver > 30 dB the minimum transmission bandwidth (in Hz) required is

Question 14

The open loop transfer function of a unity feedback system is

The value of ‘T’ to drive the system on to the verge of instability is

Question 15

For a parallel polarization the reflection coefficient is given as,
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Oct 12ESE & GATE EC