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GATE 2020: Toppers Quiz 9 (App update required to attempt this test)

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Question 1

What is the maximum value that can be displayed by a digit digital voltmeter?

Question 2

In case ICS=80A , VCC=220V, tON=1.5 μs and toff=4 μs for the switching wave forms shown in the figure, find the average power loss in the power transistor for a switching frequency of 2 kHz.

Question 3

Which of the following are the values of the R3 and L3 from owen bridge?

Question 4

What will be the peak current through main thyristor in a voltage commutated chopper circuit if the source voltage is 250V with constant load current of 10A and L=0.2mH and C= 20 µF?

Question 5

Which of the following is the 2’s complement form of -68?

Question 6

A synchronous motor operating at zero power factor leading is drawing 1 p.u. current and its synchronous reactance is 0.6 p.u. what is the excitation emf of the motor while motor is operated from a bus voltage of 1.2 p.u.

Question 7

An infinite sheet which is placed in X-Y plane, having a surface charge density δ = 8 c/m2. Another infinite line charge is also present in z direction having line charge density λ = 5 cm along the line. What will be the equivalent electric field at point P which is situated at (3, 4, 5) position, by bath the charge densities.

Question 8

For the given figure obtain the h12 parameter

Question 9

Consider the following statements with the reference to the root loci of the characteristic equation of unity feedback control system with an open loop transfer function of G(s) = .
1) Each locus starts at an open loop pole and ends either at an open loop zero or infinity
2) Each locus starts at an open loop pole or infinity and ends at an open loop zero
3) There are three separate root loci
4) There are five separate root loci
Which of these statements are correct?

Question 10

The primary and secondary impedance of a 50 MVA, 22/11 kV is pu each. Calculate the primary and secondary impedances in ohms.

Question 11

A PMMC instrument has a coil of dimension 15mm * 12 mm. The flux density in a air gap is 1.8 * 10 -3 wb/ m2 and the spring constant is 0.14 * 10 -6 n-m/rad. Determine the number of turns required to produce and angular deflection of 90 o. when current of 5mA flowing through the coil.

Question 12

A voltage 1000 sin cot Volts is applied across YZ. Assuming ideal diodes, the voltage measured across WX in Volts is

Question 13

A 100 MVA, 50 Hz generator feeding power through a double circuit transmission line with initial rotor angle 60 °. A 3 phase fault occurs at middle point of one of the lines. the internal voltage of the generator is 1.5 pu and equivalent transfer admittance during fault is 0.5 pu and the infinite bus voltage is 1.1 pu. The generator has an inertia constant of 4 MJ/MVA and it was delivering 1 pu power prior of the fault. The initial accelerating power (in pu) will be –

Question 14

A 3-φ induction motor at rated voltage and frequency has a starting torque of 150% and a maximum torque of 200% of full load torque. Neglecting stator resistance and rotational losses. Calculate the slip at maximum torque

Question 15

Two cylindrical surfaces with r = 1cm and r = 3cm are perfectly conducting and the region between them is filled with a conducting material of conductivity α. If the current density is given by ( ar^) for 1cm < r < 3cm and total power dissipated in the conducting medium per meter length is 875mw then find value of α?
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Aug 19ESE & GATE EE