GATE EE topic:electrical-machines PYQs & Answers — Page 67

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Questions 661–670 of 715. Imported answers require independent review unless marked reviewed.

Topic practice 715 questionsPage 67 of 72

For the circuit shown below, assume that the OPAMP is ideal.

Diagram for Electrical Engineering question 38

Which one of the following is TRUE?

Your answerChoose one option.

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A load is supplied by a 230 V, 50 Hz source. The active power P and the reactive power Q consumed by the load are such that 1 kW ≤ P ≤ 2 kW and 1 kVAR ≤ Q ≤ 2 kVAR. A capacitor connected across the load for power factor correction generates 1 kVAR reactive power. The worst case power factor after power factor correction is

Your answerChoose one option.

0.447 lag

0.707 lag

0.894 lag

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The figure below shows a half-bridge voltage source inverter supplying an RL-load with

and

. The desired fundamental frequency of the load voltage is 50 Hz. The switch control signals of the converter are generated using sinusoidal pulse width modulation with modulation index,

. At 50 Hz, the RL-load draws an active power of 1.44 kW. The value of DC source voltage

in volts is

Diagram for Electrical Engineering question 39

Your answerChoose one option.

500

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The bus admittance matrix for a power system network is

pu. There is a transmission line, connected between buses 1 and 3, which is represented by the circuit shown in figure.

Diagram for Electrical Engineering question 40

Reactance is 0.05 pu; susceptance is 0.05 pu at each end. If this transmission line is removed from service, what is the modified bus admittance matrix?

Your answerChoose one option.

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A person decides to toss a fair coin repeatedly until he gets a head. He will make at most 3 tosses. Let the random variable

denote the number of heads. The value of

, where

denotes the variance, equals

Your answerChoose one option.

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The switch in the figure below was closed for a long time. It is opened at

. The current in the inductor of 2 H for

, is

Diagram for Electrical Engineering question 41

Your answerChoose one option.

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For the network given in figure below, the Thevenin’s voltage

Your answerChoose one option.

-1.5 V

-0.5 V

0.5 V

1.5 V

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Only one of the real roots of

lies in the interval

and bisection method is used to find its value. For achieving an accuracy of 0.001, the required minimum number of iterations is _________.

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A 120 V DC shunt motor takes 2 A at no load. It takes 7 A on full load while running at 1200 rpm. The armature resistance is 0.8 Ω, and the shunt field resistance is 240 Ω. The no load speed, in rpm, is _____________.

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In the circuit shown below, the maximum power transferred to the resistor

is ______ W.

Diagram for Electrical Engineering question 43

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GATE EE topic:electrical-machines PYQs

Question 38

Question 39

Question 39

Question 40

Question 40

Question 41

Question 41

Question 42

Question 42

Question 43