GATE EE topic:electrical-machines PYQs & Answers — Page 63 — Exam Papers

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Questions 621–630 of 715. Imported answers require independent review unless marked reviewed.

Topic practice 715 questionsPage 63 of 72

Consider a function

given by

The partial derivative of this function with respect to

at the point,

,

and

is _________.

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The equivalent resistance between the terminals A and B is ________

.

Diagram for Electrical Engineering question 19

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Let

and

be integers satisfying the following equations

The value of

is ________.

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A three-phase, 50Hz, star-connected cylindrical-rotor synchronous machine is running as a motor. The machine is operated from a 6.6 kV grid and draws current at unity power factor (UPF). The synchronous reactance of the motor is 30 Ω per phase. The load angle is 30°. The power delivered to the motor in kW is _____. (Give the answer up to one decimal place).

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Let

and

. The value of

equals ________. (Give the answer up to three decimal places)

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A 10-bus power system consists of four generator buses indexed as G1, G2, G3, G4 and six load buses indexed as L1, L2, L3, L4, L5, L6. The generator-bus G1 is considered as slack bus, and the load buses L3 and L4 are voltage controlled buses. The generator at bus G2 cannot supply the required reactive power demand, and hence it is operating at its maximum reactive power limit. The number of non-linear equations required for solving the load flow problem using Newton-Raphson method in polar form is _____.

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For the given 2-port network, the value of transfer impedance

in ohms is ________.

Diagram for Electrical Engineering question 21

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Consider the unity feedback control system shown. The value of

that results in a phase margin of the system to be 30° is _____. (Give the answer up to two decimal places).

Diagram for Electrical Engineering question 22

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The initial charge in the 1 F capacitor present in the circuit shown is zero. The energy in joules transferred from the DC source until steady state condition is reached equals ________. (Give the answer up to one decimal place.)

Diagram for Electrical Engineering question 22

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The following measurements are obtained on a single phase load: V = 220 V ±1 %, I = 5.0 A ± 1% and W = 555 W ± 2 %. If the power factor is calculated using these measurements, the worst case error in the calculated power factor in percent is _____. (Give answer up to one decimal place.)

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