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Gate 2019: Revision Test-2
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Question 1
For a p+-n junction diode, how is the junction capacitance Cj dependent on the doping of the n-side Nd?
Question 2
The electron concentration in a sample of n-type silicon varies linearly from 1017 cm-3 at x = 0 to cm-3 at x=4 µm. There is no added electric field. The electron current density is experimentally measured to be -400A/cm2. What is the electron diffusion coefficient?
Question 3
Consider the circuits given below
I.
II.
III.
IV.
Then, which of the following options is correct?
I.
II.
III.
IV.
Then, which of the following options is correct?
Question 4
In a PLL, lock occurs when the
Question 5
If the gain margin of a certain feedback system is given as 20dB, the Nyquist plot will cross the negative real axis at the point
Question 6
The equation for the time dependence of excess carriers in reading a steady state condition is given by
If
Then the excess carrier generation rate is given by g’=____ 1021 cm-3 s-1.
If
Then the excess carrier generation rate is given by g’=____ 1021 cm-3 s-1.
Question 7
A silicon transistor with common emitter current gain of =100 and base doping concentration of Ng= 1019 cm-3 and with minimum breakout open base voltage = 20V.The minimum open emitter junction breakdown voltage must be ____ V given the empirical constant to be equal to 3.
Question 8
For a double hetro junction LED emitting light at a peak wavelength of 1.3 m has radiated and non-radiated recombination time as 40nsec and 120nsec respectively, then the bulk recombination lifetime will be
Question 9
The built-in potential for a silicon p-n junction diode with ND= 1014 cm-3 and NA= 1017 cm-3 for T=300K will be ___V?
(Given intrinsic carrier concentration ni=1.51010 cm3).
(Given intrinsic carrier concentration ni=1.51010 cm3).
Question 10
In the voltage regulator circuit shown in the figure, the op-amp is ideal. The BJT has VBE = 0.7 V and β = 100, and the zener voltage is 4.7 V. For a regulated output of 9 V, the value of R (in Ω) is _______.
Question 11
What is the rank of following controllability of the system
A= B =
A= B =
Question 12
The open loop transfer function of a unity feedback system is The value of ‘K’ for which the closed loop pole of the system will be located at s= -6 is____
Question 13
An Integrator has transfer function given by If it is required to have gain magnitude unity at frequency = 250 rad/sec then, the gain that must be placed in cascade will be ______.
Question 14
A feedback control system is shown below
If the forward path gain is 400 and feedback gain is 0.05. The percentage change in closed loop gain for 10% change in G is ________
If the forward path gain is 400 and feedback gain is 0.05. The percentage change in closed loop gain for 10% change in G is ________
Question 15
The gain margin and the phase margin of a feedback system with are
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Aug 8ESE & GATE EC