GATE EE concept:voltage PYQs & Answers

Questions 1–10 of 61. Imported answers require independent review unless marked reviewed.

The initial three-phase voltage phasors (

, and

) at a bus of a power network are as shown in Case-1. Due to a disturbance, the bus voltage phasors changed in phase by a small angle

, and the magnitudes remained the same as depicted in Case-2.

Diagram for Electrical Engineering question 19

Which one of the following statements is correct about the zero sequence components?

Your answerChoose one option.

The zero sequence components in Case-1 and Case-2 have the same phase angle and magnitude

The magnitude of the zero sequence component in Case-1 is greater than that in Case-2

The magnitude of the zero sequence component in Case-2 is greater than that in Case-1

The zero sequence components in Case-1 and Case-2 have the same magnitude but different phase angles

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Consider the circuit shown in Figure (a). A gate pulse

is applied between time instants

and

. After

, during the MOSFET turn OFF process, it experiences a voltage overshoot.

Based on the

waveforms shown in Figure (b), which one of the following options is correct?

Diagram for Electrical Engineering question 28

Your answerChoose one option.

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Consider the circuit shown. Assume that the diode D is ideal. The supply voltage

, and

. The peak diode current (in amperes) is ______________

(Round off to one decimal place)

Diagram for Electrical Engineering question 34

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A three-phase two-winding transformer has a voltage transformation ratio

, where

is the primary side voltage in p.u., and

is the secondary side voltage in p.u.

and

represent the currents injected into the primary and secondary sides of the transformer, respectively. The admittance corresponding to the leakage impedance of the transformer referred to the secondary is

p.u. Neglect the magnetizing branch.

Diagram for Electrical Engineering question 41

The Y bus representation of this transformer is:

Your answerChoose one option.

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Consider the single-phase voltage source inverter circuit feeding an inductive load (L). Assume that the power MOSFET switches are ideal. S₁ and S₂ are switched on during the first 10 μs, and S₃ and S₄ are switched on during the next 10 μs in a switching cycle. The switches in the same leg are thus switched in a complementary fashion. Neglect the dead time. The waveform of the inductor current (i_L) in the steady state is triangular with a peak value of 5 A as shown.

Diagram for Electrical Engineering question 47

The rms value of the current through the switch S₁ is:

Your answerChoose one option.

2.8 A

2.04 A

3.54 A

2.50 A

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Consider the boost converter circuit shown. Assume that the semiconductor devices are ideal. In steady state, the inductor current rises linearly from 0 A to 6 A in the first 10

and then falls linearly from 6 A to 0 A in the next 10

of every switching cycle as shown. The load resistance R is 10

and the capacitance C is 500

Diagram for Electrical Engineering question 48

Neglect the ripple in the output voltage. What is the input voltage

Your answerChoose one option.

10.0 V

15.0 V

7.5 V

12.5 V

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The input voltage

and current

of a converter are given by,

where,

. The input power factor of the converter is closest to

Your answerChoose one option.

0.845

0.867

0.887

1.0

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Consider a distribution feeder, with

ratio of 5. At the receiving end, a 350 kVA load is connected. The maximum voltage drop will occur from the sending end to the receiving end, when the power factor of the load is __________ (round off to three decimal places).

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The bus impedance matrix of a 3-bus system (in pu) is

. A symmetrical fault (through a fault impedance of

pu) occurs at bus 2. Neglecting pre-fault loading conditions, the voltage at bus 1, during the fault is ______ pu (round off to three decimal places).

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The 3-phase modulating waveforms

and

, used in sinusoidal PWM in a Voltage Source Inverter (VSI) are

where

is the fundamental frequency. The modulating waveforms are compared with a 10 kHz triangular carrier whose magnitude varies between +1 and −1. The VSI has a DC link voltage of 600 V and feeds a star connected motor. The per phase fundamental RMS motor voltage, in volts, is closest to

Your answerChoose one option.

169.71

300.00

424.26

212.13

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GATE EE concept:voltage PYQs

How to practice concept:voltage

Question 19

Question 28

Question 34

Question 41

Question 47

Question 48

Question 27

Question 32

Question 33

Question 46