GATE EE format:nat PYQs & Answers — Page 8

Questions 71–80 of 256. Imported answers require independent review unless marked reviewed.

Topic practice 256 questionsPage 8 of 26

When the winding c-d of the single-phase, 50 Hz, two winding transformer is supplied from an AC current source of frequency 50 Hz, the rated voltage of 200 V (rms), 50 Hz is obtained at the open-circuited terminals a-b. The cross sectional area of the core is 500 mm

and the average core length traversed by the mutual flux is 500 mm. The maximum allowable flux density in the core is

Wb/m

and the relative permeability of the core material is 5000. The leakage impedance of the winding a-b and winding c-d at 50 Hz are

and

, respectively. Considering the magnetizing characteristics to be linear and neglecting core loss, the self-inductance of the winding a-b in millihenry is __________ (Round off to 1 decimal place).

Diagram for Electrical Engineering question 53

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The circuit shown in the figure is initially in the steady state with the switch K in open condition and

in closed condition. The switch K is closed and

is opened simultaneously at the instant

, where

. The minimum value of

in milliseconds, such that there is no transient in the voltage across the 100

F capacitor, is ____________ (Round off to 2 decimal places).

Diagram for Electrical Engineering question 54

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The circuit shown in the figure has reached steady state with thyristor T in OFF condition. Assume that the latching and holding currents of the thyristor are zero. The thyristor is turned ON at t = 0 sec. The duration in microseconds for which the thyristor would conduct, before it turns off, is _____ (Round off to 2 decimal places).

Diagram for Electrical Engineering question 55

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Neglecting the delays due to the logic gates in the circuit shown in figure, the decimal equivalent of the binary sequence [ABCD] of initial logic states, which will not change with clock, is ____________.

Diagram for Electrical Engineering question 56

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In a given 8-bit general purpose micro-controller there are following flags.

C-Carry, A-Auxiliary Carry, O-Overflow flag, P-Parity (0 for even, 1 for odd)

R0 and R1 are the two general purpose registers of the micro-controller.

After execution of the following instructions, the decimal equivalent of the binary sequence of the flag pattern [CAOP] will be ________.

MOV R0, +0x60

MOV R1, +0x46

ADD R0, R1

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The single phase rectifier consisting of three thyristors T₁, T₂, T₃ and a diode D₁ feed power to a 10 A constant current load. T₁ and T₃ are fired at α = 60° and T₂ is fired at α = 240°. The reference for α is the positive zero crossing of vᵢₙ. The average voltage Vₒ across the load in volts is _____ (Round off to 2 decimal places).

Diagram for Electrical Engineering question 58

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The Zener diode in circuit has a breakdown voltage of 5 V. The current gain β of the transistor in the active region in 99. Ignore base-emitter voltage drop V_BE. The current through the 20 Ω resistance in milliamperes is _______(Round off to 2 decimal places).

Diagram for Electrical Engineering question 59

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The two-bus power system shown in figure (i) has one alternator supplying a synchronous motor load through a Y-Δ transformer. The positive, negative and zero-sequence diagrams of the system are shown in figures (ii), (iii) and (iv), respectively. All reactances in the sequence diagrams are in p.u. For a bolted line-to-line fault (fault impedance = zero) between phases ‘b’ and ‘c’ at bus 1, neglecting all pre-fault currents, the magnitude of the fault current (from phase ‘b’ to ‘c’) in p.u. is __________ (Round off to 2 decimal places).

Diagram for Electrical Engineering question 60

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An infinite surface of linear current density

A/m exists on the x-y plane, as shown in the figure. The magnitude of the magnetic field intensity (H) at a point (1,1,1) due to the surface current in Ampere/meter is ________ (Round off to 2 decimal places).

Diagram for Electrical Engineering question 61

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The closed curve shown in the figure is described by

The magnitude of the line integral of the vector field

around the closed curve is ________ (Round off to 2 decimal places).

Diagram for Electrical Engineering question 62

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GATE EE format:nat PYQs

Question 53

Question 54

Question 55

Question 56

Question 57

Question 58

Question 59

Question 60

Question 61

Question 62