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GATE 2019: Power Systems Rapid Mini Mock

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Question 1

Which of the following results in improvement of power system stability?

Question 2

What information can be obtained from Equal Area Criterion?

Question 3

A large alternator supplies power to an infinite bus, it suddenly suffers a short circuit fault at its terminals. Let the voltage behind transfer reactance remains constant immediately after the fault, the acceleration of the generator rotor will be

Question 4

If the angular moment of a 100MVA generator is 0.2. Find the new angular moment for 50MVA base.

Question 5

A three phase, 500 MVA, 21.1 kV generator has solidly grounded neutral. The Z₁, Z₂, Z₀ of the generator are 0.2 pu, 0.2 pu, and 0.05 pu, respectively, at the base quantities. If a LG fault occurs at the terminal of the unloaded generator, the fault current in amperes immediately after the fault (kA) is _________.

Question 6

A 50 Hz loss less overhead long line has inductance per phase per km as 5 mH/km. The capacitance per phase per km will be approximately

Question 7

A transmission line having a reactance of 1.0 pu is operating at V_s = V_r = 1pu. The generator is connected at source end which is delivering 0.75pu of active power and the transmission line is compensated with a series capacitance of 0.15pu. Find the load angle (in degrees) with series capacitance compensation?

Question 8

What is the load power factor when voltage regulation is found to be zero and resistance & reactance appears to be equal in a short transmission line?

Question 9

Three conductors of radius R each are arranged on the edges of an equilateral triangle. The spacing between two conductors in 4R. The geometric mean radius (GMR) (in cm) of the composite conductor is kR. The value of k is_______.

Question 10

A given Z_bus of a power system is given as

And, an impedance of j0.4 ohm is connected in parallel with Z₂₂Then modified value of Z₂₂

Question 11

In a 3 φ unsymmetrical transmission system the distance between conductors ab, bc and ca is 3 m, 4 m and 5 m respectively. The radius of each conductor is 2 cm. The capacitance of each phase is _________ pF/m.

Question 12

Form the y- bus matrix for the network shown in figure.

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ESE & GATE EE Power Systems

Feb 4ESE & GATE EE