GATE 2020:Topper's Quiz-20 (App update required to attempt this test) for ESE & GATE EC Exams

Question 1

If a material is having a bandgap of 1.73 eV, then the wavelength of photons emitted from it will be ______________ x

cm.

Question 2

The minimum voltage along a transmission line is 260V, while the maximum is 390V. The standing wave Ratio (SWR) is

Question 3

If 3 zeroes and 4 poles of F(S) lie in the right half of s-plane and enclosed by the s-plane closed contour, then what will be the status of the encirclement?

Question 4

Sampling rate of Delta modulation compared to pulse code modulation is

Question 5

A two stage amplifier using BJTs is realized using identical stages, where each stage has a lower cut-off (3 dB) frequency of 120 Hz due to coupling capacitor. Also the emitter bypass capacitor provides a lower cut-off (3 dB) due to emitter degeneration of 100 Hz. The lower (3 dB) cut-off frequency(in Hz) of the overall configuration is approximately,

Question 6

Let the minimum number of NAND gates required for the implementation of AB+CD is X and the minimum number of nor gates required for the implementation of AB+CD is Y .Then X*Y =_________

Question 7

Determine the high level and low level noise margins for a logic gate and find average power dissipation when V_CC = 5V and draws 2 μA when its output is high, 3.6 μA when its output is low, gate is operated on a 50% duty cycle.

V_OH(min) = 4.4 V

V_1L(max) = 1.5 V

V_OL(max) = 0.33 V

V_1H(min) = 3.5 V

Question 8

A Si p-n junction diode of length (L) has doping profile shown below

If the applied reverse bias voltage V_R = 10 V, the space charge region width is ______ μm. (Assume n_i = 1.5 × 10¹⁰/cm³. V_T = 0.0259 V)

Question 9

Let the state transition matrix of a system be given as

Then which of the following is equal to

Question 10

A ROM has 6 input pins and output pins then which among the following is true.

Question 11

If input

, The output for the circuit shown would be

Question 12

Find output Y?

Question 13

A unity negative feedback system has an open-loop transfer function $Description: Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE EC 10-Mar\GATE-ECE-2015-Paper-2_files\image012.png$ . The gain K for the system to have a damping ratio of 0.25 is ______.

Question 14

Concentric spherical shells of radii 2 m, 4 m, and 8 m carry uniform surface charge densities of

respectively. The value of

required to ensure that the electric flux density

at radius 10 m is ______.

Question 15

Find the energy of the signal x(n) whose Z transform is given as

Question 16

A matched filter has the input

for

otherwise calculate the peak amplitude of filter output in mV.

Question 17

A receiver has been operating at 290 K and receiving a signal of bandwidth 400 kHz. The amplifier used in the receiver has an average output resistance of 1.5 kΩ. This will lead to Johnson noise voltage of ________ μV.

Question 18

The feedback used in the circuit shown below can be classified as
2019-11-10.png (1920×1080)

Question 19

Consider the periodic square wave in the figure shown.

The ratio of the power in the 7^th harmonic to the power in the 5^th harmonic for this waveform is closest in value to _______.

Question 20

A metal wire carries a conduction current of 0.5 A. What is the displacement current in the wire at 50 MHz? (Assume the permittivity of the metal

and the conductivity

)