GATE EE concept:voltage PYQs & Answers — Page 5

Questions 41–50 of 61. Imported answers require independent review unless marked reviewed.

Topic practice 61 questionsPage 5 of 7

A three-phase 50 Hz, 400 kV transmission line is 300 km long. The line inductance is 1 mH/km per phase, and the capacitance is 0.01 μF/km per phase. The line is under open circuit condition at the receiving end and energized with 400 kV at the sending end, the receiving end line voltage in kV (round off to two decimal places) will be _____________.

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In a DC-DC boost converter, the duty ratio is controlled to regulate the output voltage at 48 V. The input DC voltage is 24 V. The output power is 120 W. The switching frequency is 50 kHz. Assume ideal components and a very large output filter capacitor. The converter operates at the boundary between continuous and discontinuous conduction modes. The value of the boost inductor (in μH) is __________.

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A single-phase fully-controlled thyristor converter is used to obtain an average voltage of 180 V with 10 A constant current to feed a DC load. It is fed from single-phase AC supply of 230 V, 50 Hz. Neglect the source impedance. The power factor (round off to two decimal places) of AC mains is ____________.

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A single phase fully controlled rectifier is supplying a load with an anti-parallel diode as shown in the figure. All switches and diodes are ideal. Which one of the following is true for instantaneous load voltage and current?

Diagram for Electrical Engineering question 3

Your answerChoose one option.

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Consider a lossy transmission line with

and

as the sending and receiving end voltages, respectively.

and

are the series impedance and reactance of the line, respectively. The steady-state stability limit for the transmission line will be

Your answerChoose one option.

greater than $\left|\frac{V_1 V_2}{X}\right|

less than $\left|\frac{V_1 V_2}{X}\right|

equal to

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The positive, negative and zero sequence impedances of a 125 MVA, three-phase, 15.5 kV, star-grounded, 50 Hz generator are j0.1 pu, j0.05 pu and j0.01 pu respectively on the machine rating base. The machine is unloaded and working at the rated terminal voltage. If the grounding impedance of the generator is j0.01 pu, then the magnitude of fault current for a b-phase to ground fault (in kA) is __________ (up to 2 decimal places).

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The waveform of the current drawn by a semi-converter from a sinusoidal AC voltage source is shown in the figure. If

A, the rms value of fundamental component of the current is __________ A (up to 2 decimal places).

Diagram for Electrical Engineering question 23

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A phase controlled single phase rectifier, supplied by an AC source, feeds power to an R-L-E load as shown in the figure. The rectifier output voltage has an average value given by

, where

volts and

is the firing angle. If the power delivered to the lossless battery is 1600 W,

in degree is_______ (up to 2 decimal places).

Diagram for Electrical Engineering question 49

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The figure shows two buck converters connected in parallel. The common input dc voltage for the converters has a value of 100 V. The converters have inductors of identical value. The load resistance is 1

. The capacitor voltage has negligible ripple. Both converters operate in the continuous conduction mode. The switching frequency is 1 kHz, and the switch control signals are as shown. The circuit operates in the steady state. Assuming that the converters share the load equally, the average value of

, the current of switch S1 (in Ampere), is ____ (up to 2 decimal places).

Diagram for Electrical Engineering question 50

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A dc to dc converter shown in the figure is charge a battery bank, B2 whose voltage is constant at 150 V. B1 is another battery bank whose voltage is constant at 50 V. The value of the inductor, L is 5 mH and the ideal switch, S is operated with a switching frequency of 5 kHz with a duty ratio of 0.4. Once the circuit has attained steady state and assuming the diode D to be ideal, the power transferred from B1 to B2 (in Watt) is __________ (up to 2 decimal places).

Diagram for Electrical Engineering question 53

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GATE EE concept:voltage PYQs

Question 49

Question 53

Question 55

Question 3

Question 6

Question 21

Question 23

Question 49

Question 50

Question 53