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GATE 2019: Topper Quiz 16 (App update required to attempt this test)

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Question 1

The feedback amplifier shown in fig. makes use of an op amp with internal gain (open loop gain) A = 105. How much is the output voltage for input signal vs = 2mV in the circuit shown.

Question 2

For the given n-channel MOSFET, determine the % decrease in the drain current at VGS = 1 V, if the n-channel between the two n-doped regions is removed.
Given that: IDSS = 8 mA, VP = -6 V, VT = 4 V.

Question 3

Gray code of 1111011 is

Question 4

Which of the following is not correct?

Question 5

The block diagram representation of 1st order control system is shown in figure below:
 
Which one of the following is the correct representation of unit step response of a 1st order system?

Question 6

The transfer function of a system is given by
Y(s)/X(s) = e−0.3s/1+s.
If x(t) is 0.5sint, then the phase angle between the output and the input will be:

Question 7

A 600V, 37KW series motor runs at 790rpm on full load. If the load torque is made 220Nm and a 7Ω resistor is connected in series with the machine, the speed regulation [in %] of machine is…. (neglect losses, assume magnetic circuit to be unsaturated)

Question 8

A 3-phase, 50Hz, 4 pole alternator with 3 slots/pole/phase has 4 conductors per slot with a double layer winding. The coil span is 6 slots and the flux per pole is 0.1Wb. The emf per phase in volts is

Question 9

A radial field ɸ A/m exists in free space. The magnetic flux ɸ crossing the surface defined by ,

wb/m2

Question 10

A 0.8 m long conductor moves in a uniform magnetic field of density 1.5 T perpendicular to its direction of motion. If a voltage of 6 V is induced in the conductor, determine the distance travelled by the conductor in 0.03 s.

Question 11

An incandescent lamp is marked 40 W, 240V. If resistance at room temperature (26 °C) is 120Ω, and temperature coefficient of resistance is 4.5 × 10–3/ °C, then its 'ON' state filament temperature in °C is approximately_____

Question 12

Which of the following type of ammeter is used for the measurement of direct current only?

Question 13

Two identical coils of negligible resistance when connected in parallel across a 100V, 50Hz source draws a current of 9A. When the terminals of one of the coil are reversed then current drawn is 6A. Then the coefficient of coupling between the coils is ……………..

Question 14

Find the parameters of the following circuit

Question 15

In the given voltage commutation circuit, Vs= 300V, L=15mH, C=45μF for a constant load current of 110A. the peak inverse voltage across FD and main SCR is


                                          

Question 16

In the LC circuit shown below

L=4mH, C= 40μF. The initial current through inductor is zero while the initial voltage across capacitor is 300V. if the switch is closed at t=0, then the current i through the circuit

Question 17

A three phase to ground fault occurs at ‘f’ in the network show in figure.
Generator G1 :
Generator G2 :

Transformer

Each line :


The current flowing through ground is [in p.u.] :

Question 18

A 3-∅ fault occurs at middle point F on the transmission line as shown below.


The transfer reactance between generator and infinite bus in p.u will be

Question 19

Consider the following statements
(i) For stability of causal system, poles of transfer function should lie in the LHS of s-plane.
(ii) For stability of anti-causal system, poles of transfer function should lie in the RHS of s-plane.
(iii) If poles of the transfer function lie in the LHS plane then the system is always stable.
(iv) For stability of a system, ROC must include imaginary axis.
Which of the following statements are true?

Question 20

Given that and , then the laplace of the signal is
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Dec 9ESE & GATE EE