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BARC EE Quiz 8

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Question 1

A series motor is best suited for driving_______.

Question 2

A four-pole. Lap-wound DC machine has 462 conductors in the armature. The average flux per pole is 0.02 Wb. Determine the induced armature voltage when the armature rotates at 1000 rpm.

Question 3

Choose the INCORRECT statement with respect to the core type induction furnace.

Question 4

Planes Z = 0 and Z = 4 carry current  and  respectively. Determine  at. (0, –1, 3)

Question 5

The iron loss in a 100 kVA transformer is 1 kW and full load copper losses are 4 kW. The maximum efficiency occurs at a load of-

Question 6

If a 10-bus test system contains 12 transmission lines and one transformer, how many non-zero elements are there in the system Y-Bus?

Question 7

A system is described by the following state equations:

y(t) = [1 2] x(t)

The transfer function of the system is

Question 8

A transmission line of inductance 0.4H and resistance 5ohm is suddenly short circuited at t = 0 and V = 100 sin (100πt + 25°). The instantaneous current waveform consists of

Question 9

The line current, of a 3 – phase delta circuit are:-

IR = (3 + 2j)A

IY = (2 + 5j)A

IB = (–2 – j1)A

The zero-sequence current in the line will be:

Question 10

A star connected 3-ϕ 11 kV, 25 MVA alternator with its neutral grounded through a 0.025 Pu reactance has positive, negative and zero-sequence reactance are 0.2 Pu, 0.1 Pu and 0.05 Pu respectively. Find out the fault MVA rating for a single line to ground fault.
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Apr 18ESE & GATE EE