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Vizag Steel Re-Exam: Quiz 6

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Question 1

A lossless transmission line having Surge Impedance Loading (SIL) of 2280 MW is provided with a uniformly distributed series capacitive compensation of 30%. Then, SIL of the compensated transmission line will be

Question 2

An inductor of 0.3125 H, is in steady state condition & carries a current of 2.28 Amp in their circuitry, then how much amount of Magnetic Energy stored in the inductor 

Question 3

Two conductors are carrying forward and return current of +I and –I as shown in Fig. The magnetic field intensity at point P is

Question 4

The self-inductance of the primary winding of a single phase, 50 Hz, transformer is 800 mH, and that of the secondary winding is 600 mH. The mutual inductance between these two windings is 480 mH. The secondary winding of this transformer is short circuited and the primary winding is connected to a 50 Hz, single phase, and sinusoidal voltage source. The current flowing in both the windings is less than their respective rated currents. The resistance of both windings can be neglected. In this condition, what is the effective inductance (in mH) seen by the source?

Question 5

A two machine power system is shown below. Transmission line XY has positive sequence impedance of Z1Ω and zero sequence impedance of Z0Ω.

An ‘a’ phase to ground fault with zero fault impedance occur at the centre of the transmission line. Bus voltage at X and line current from X to F for the phase ‘a’, are given by Va volts and Ia Amperes, respectively. Then, the impedance measured by the ground distance relay located at the terminal X of line XY will be given by

Question 6

A thin uniformly polarized rod of length 2L parallel to x-axis at distance d from point charge q represents Lorentz force density as shown. What will be the correct expression for Lorentz force density in point charges q at the origin?

Question 7

The energy in poynting theorem is explained as:

Question 8

What will be the current in the circular coil of radius 15 cm having magnetic field strength of 2,000 A/m, if the coil is wound with 250 turns.

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Mar 28ESE & GATE EE