GATE EE discipline:electrical-electronics-and-instrumentation PYQs & Answers — Page 38

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Questions 371–380 of 715. Imported answers require independent review unless marked reviewed.

Topic practice 715 questionsPage 38 of 72

Suppose

and

are a set of unbalanced current phasors in a three-phase system. The phase-B zero-sequence current

p.u. If phase-A current

p.u and phase-C current

p.u, then

in p.u is

Your answerChoose one option.

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A counter is constructed with three D flip-flops. The input-output pairs are named

, and

, where the subscript 0 denotes the least significant bit. The output sequence is desired to be the Gray-code sequence 000, 001, 011, 010, 110, 111, 101, and 100, repeating periodically. Note that the bits are listed in the

format. The combinational logic expression for

Your answerChoose one option.

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Let A be a

matrix such that

is a null matrix, and let I be the

identity matrix. The determinant of

is _____________.

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A three-phase balanced voltage is applied to the load shown. The phase sequence is RYB. The ratio

is ___________.

Diagram for Electrical Engineering question 39

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In the given circuit, for maximum power to be delivered to

, its value should be __________

. (Round off to 2 decimal places.)

Diagram for Electrical Engineering question 40

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One coulomb of point charge moving with a uniform velocity

m/s enters the region

having a magnetic flux density

T. The magnitude of force on the charge at

is __________ N. (

, and

are unit vectors along x-axis, y-axis, and z-axis, respectively.)

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Consider a large parallel plate capacitor. The gap

between the two plates is filled entirely with a dielectric slab of relative permittivity 5. The plates are initially charged to a potential difference of

volts and then disconnected from the source. If the dielectric slab is pulled out completely, then the ratio of the new electric field

in the gap to the original electric field

is __________.

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Consider a continuous-time signal

defined by

for

, and

for

. Let the Fourier transform of

be defined as

. The maximum magnitude of

is __________.

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A belt-driven DC shunt generator running at 300 RPM delivers 100 kW to a 200 V DC grid. It continues to run as a motor when the belt breaks, taking 10 kW from the DC grid. The armature resistance is 0.025

, field resistance is 50

, and brush drop is 2 V. Ignoring armature reaction, the speed of the motor is __________ RPM. (Round off to 2 decimal places.)

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An 8-pole, 50 Hz, three-phase, slip-ring induction motor has an effective rotor resistance of 0.08 Ω per phase. Its speed at maximum torque is 650 RPM. The additional resistance per phase that must be inserted in the rotor to achieve maximum torque at start is ______ Ω. (Round off to 2 decimal places.) Neglect magnetizing current and stator leakage impedance. Consider equivalent circuit parameters referred to stator.

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GATE EE discipline:electrical-electronics-and-instrumentation PYQs

Question 36

Question 37

Question 38

Question 39

Question 40

Question 41

Question 42

Question 43

Question 44

Question 45