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GATE 2021: Toppers Quiz-17 (App update required to attempt this test)

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Question 1

The time period of the output generated by the op-amp circuit shown in figure is  (in sec). (For diode V= 0.7 V).

Question 2

An AC source of RMS voltage 20 V with internal impedance Zy = (1+2j) Ω feeds a load of impedance ZL = (7 + 4j) Ω is the figure below. The reactive power consumed by the load is

Question 3

In the circuit shown, what value of RL the maximum power is delivered to RL?

Question 4

The input impedance (Zi) and the output impedance (Z0) of an ideal transconductance (voltage controlled current source) amplifier are

Question 5

The time domain behavior of an RL circuit is represented by

For an initial current of , the steady state value of the current is given by

Question 6

A regulated power supply, shown in figure below has an unregulated input (UR) of 15 Volts and generates a regulated output Vout. Use the component values shown in the figure.

In the figure above, the ground has been shown by the symbol.
The power dissipation across the transistor Q1 shown in the figure is:

Question 7

A source generates three symbols with probabilities 0.25, 0.25, 0.50 at a rate of 3000 symbols per second. Assuming independent generation of symbols, the most efficient source encoder would have average bit rate as

Question 8

After execution of line 7 of the program, the status of the CY and Z flags will be

Question 9

A uniform plane wave in the free space is normally incident on an infinity thick dielectric slab (dielectric constant ). The magnitude of the reflection coefficient is

Question 10

A second-order linear time-invariant system is described by the following state equations
 
where x1(t) and x2(t) are the two state variables and u(t) denotes the input. If the output c(t) = x1(t), then the system is

Question 11

An 8255 chip is interfaced to an 8085 Microprocessorsystem as an I/O mapped I/O as shown in the figure. The address lines A0 and A1 of the 8085 are used by the 8255 chip to decode internally its three ports and the Control register. The address lines A3 to A7 as well as the IO/ signal are used for address decoding. The range of addresses for which the 8255 chip would get selected is:

Question 12

An n-channel depletion MOSFET has following two points on its ID – VGS curve:
(i) VGS = 0 at ID = 12mA and
(ii) VGS = –6 Volts at ID = 0
Which of the following Q-points will give the highest trans-conductance gain for small signals?

Question 13

A silicon wafer has 100 nm of oxide on it and is inserted in a furnace at a temperature above 1000ºC for further oxidation in dry oxygen. The oxidation rate

Question 14

One of a loss-less transmission line having the Characteristic Impedance of 75Ω and length of 1cm is short-circuited. At 3GHz, the input impedance at the other end of the transmission line is

Question 15

The minimum sampling frequency (in samples/sec) required to reconstruct the following signal from its samples without distortion.
would be:

Question 16

For the unity feedback control system shown in the figure, the open-loop transfer function G(s) is given as
3.20.JPG
The steady state error essdue to a unit step input is

Question 17

The first two rows in the Routh table for the characteristic equation of a certain closed-loop control system are given as
46.PNG
The range of K for which the system is stable is

Question 18

In the Digital -toAnalog conveter circuit shown in the figure below, VR =10 V and R = 10 kΩ

The current i is:

Question 19

For static electric and magnetic fields in an inhomogeneous source-free medium, which of the following represents the correct form of two of Maxwell’s equations?

Question 20

In the following limiter circuit, an input voltage Vi = 10 sin 100πt applied. Assume that the diode drop is 0.7V when it is forward biased. The zener breakdown voltage is 6.8 V.

The maximum and minimum values of the output voltage respectively are
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Jun 5ESE & GATE EC