GATE EE concept:voltage PYQs & Answers — Page 2

Questions 11–20 of 61. Imported answers require independent review unless marked reviewed.

An ideal sinusoidal voltage source

feeds an ideal inductor

through an ideal SCR with firing angle

. If

, then the peak of the inductor current, in ampere, is closest to

Diagram for Electrical Engineering question 47

Your answerChoose one option.

20.71

10.35

7.32

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In the following circuit, the average voltage

where

is the firing angle. If the power dissipated in the resistor is 64 W, then the closest value of

in degrees is

Diagram for Electrical Engineering question 48

Your answerChoose one option.

35.9

46.4

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The steady state capacitor current of a conventional DC-DC buck converter, working in CCM, is shown in one switching cycle. If the input voltage is 30 V, the value of the inductor used, in mH, is ______________ (round off to one decimal place).

Diagram for Electrical Engineering question 60

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A single-phase triac based AC voltage controller feeds a series RL load. The input AC supply is 230 V, 50 Hz. The values of R and L are 10

and 18.37 mH, respectively. The minimum triggering angle of the triac to obtain controllable output voltage is

Your answerChoose one option.

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For the three-bus lossless power network shown in the figure, the voltage magnitudes at all the buses are equal to 1 per unit (pu), and the differences of the voltage phase angles are very small. The line reactances are marked in the figure, where

, and

are strictly positive. The bus injections

and

are in pu. If

, where

, and the real power flow from bus 1 to bus 2 is 0 pu, then which one of the following options is correct?

Diagram for Electrical Engineering question 41

Your answerChoose one option.

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For a two-phase network, the phase voltages

and

are to be expressed in terms of sequence voltages

and

. The possible option(s) for matrix

is/are

Your answerSelect all correct options. You can choose more than one.

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Which of the following options is/are correct for the Automatic Generation Control (AGC) and Automatic Voltage Regulator (AVR) installed with synchronous generators?

Your answerSelect all correct options. You can choose more than one.

AGC response has a local effect on frequency while AVR response has a global effect on voltage.

AGC response has a global effect on frequency while AVR response has a local effect on voltage.

AGC regulates the field current of the synchronous generator while AVR regulates the generator’s mechanical power input.

AGC regulates the generator’s mechanical power input while AVR regulates the field current of the synchronous generator.

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A single-phase full bridge voltage source inverter (VSI) feeds a purely inductive load. The inverter output voltage is a square wave in 180° conduction mode. The fundamental frequency of the output voltage is 50 Hz. If the DC input voltage of the inverter is 100 V and the value of the load inductance is 20 mH, the peak-to-peak load current in amperes is ______ (rounded off to the nearest integer).

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In the DC-DC converter shown in the figure, the current through the inductor is continuous. The switching frequency is 500 Hz. The voltage (

) across the load is assumed to be constant and ripple free. The peak inductor current in amperes is ______ (rounded off to the nearest integer).

Diagram for Electrical Engineering question 64

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A single-phase full-controlled thyristor converter bridge is used for regenerative braking of a separately excited DC motor with the following specifications:

Specification	Value
Rated armature voltage	210 V
Rated armature current	10 A
Rated speed	1200 rpm
Armature resistance	1 Ω
Input to the converter bridge	240 V at 50 Hz
The armature of the DC motor is fed from the full-controlled bridge and the field current is kept constant.

Assume that the motor is running at 600 rpm and the armature terminals of the motor are suitably reversed for regenerative braking. If the armature current of the motor is to be maintained at the rated value, the triggering angle of the converter bridge in degrees should be ______ (rounded off to 2 decimal places).

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GATE EE concept:voltage PYQs

Question 47

Question 48

Question 60

Question 28

Question 41

Question 46

Question 47

Question 63

Question 64

Question 65