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JKSSB JE Electric 2015 Paper

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Question 1 of 146

FET belongs to which of the following type of device?

Electrical
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Explanation

Field?Effect Transistors are voltage?controlled devices (gate voltage controls channel current).

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Question ID: 8828

Question 2 of 146

What is the purpose of providing a fuse in an electric circuit?

Electrical
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Explanation

Fuses protect circuits from excessive current by blowing when current exceeds rating.

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Question ID: 8827

Question 3 of 146

Which among the following is the dual of Boolean expression X+YZ=(X+Y) (X+Z)?

Electrical
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Explanation

Dual of distribution law X+YZ = (X+Y)(X+Z) is X(Y+Z)=XY+XZ (option B with corrected formatting).

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Question ID: 8826

Question 4 of 146

A three phase transmission line delivers a load of 5 MW at 0.8 power factor lagging. Resistance of each conductor is 0.5 ohm / km. Receiving end voltage is 33 kV. If the line loss is not to exceed 10%, determine the length of the line.

Electrical
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Explanation

Computed I = 109.35 A and required length L ? 27.878 km to keep losses ?10% (see Excel). Choose nearest option if desired. Computed I=109.35 A, required length ? 27.878 km; nearest option B (27.9 km).

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Question ID: 8825

Question 5 of 146

One 200 KVA transformer has an iron loss of 1 KW and full load Cu loss of 2 KW. Its load KVA corresponding to maximum efficiency is:

Electrical
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Explanation

Max efficiency occurs at load = rating ? sqrt(P_core/P_cu_full) =200?sqrt(1/2)=200?0.7071=141.4 KVA.

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Question ID: 8824

Question 6 of 146

In which type of the faults given below, all of the three components Ia0, Ia1 and Ia2 are equal?

Electrical
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Explanation

For single line-to-ground fault, sequence currents are equal (Ia0=Ia1=Ia2).

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Question ID: 8823

Question 7 of 146

What does the region around the stationary electric charge has?

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Explanation

A stationary charge produces an electric field.

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Question ID: 8822

Question 8 of 146

The hysteresis loop of magnetic material has an area of 5 cm2 with the scales given as 1 cm=2AT and 1 cm=50 mWb, at 50 Hz, the total hysteresis loss is

Electrical
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Explanation

Energy per cycle ? area ? scale factors =5?(2?0.05)=0.5 J per cycle; ?50 Hz =25 W.

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Question ID: 8821

Question 9 of 146

RMS value of rectangular wave of period T, having a value of +V for a duration T1(

Electrical
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Explanation

Since waveform magnitude is ?V, squared value is V^2 for entire period ? RMS = V.

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Question ID: 8820

Question 10 of 146

Determine the transformer tap ratios when the receiving end voltage is equal to the sending end voltage, the high voltage line operates at 220 kV and transmit 80 MW at 0.8 pf and the impedance of the line is (40+j140)ohm. Assume tstr=1.0

Electrical
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Explanation

Using approximate regulation/tap calculations the nearest tap ratio is 0.9 (exam-type choice).

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Question ID: 8819

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