Download AKTU B-Tech 2nd Sem 2018-2019 KEE201 Electrical Engineering Question Paper

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Printed Pages: 02 Sub Code:KEE201

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Paper Id: 120262 Roll No.

B TECH

(SEM II) THEORY EXAMINATION 2018-19

ELECTRICAL ENGINEERING

Time: 3 Hours

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Total Marks: 100

Note: 1. Attempt all Sections. If you require any missing data, choose suitably.

SECTION A

1. Attempt all questions in brief. 2 x 10 = 20 CO
1. Define the purpose of Earthing the electrical appliances 5

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2. What are the various three phase transformer connections? Name them. 3
3. Explain why transformer cannot be operated on DC. 3
4. What is difference between primary and secondary batteries? 5
5. Define active and passive elements. 1
6. Three resistances each of 20O, 30O & 50O are connected in delta. Calculate corresponding resistances in equivalent star connection. 1

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7. What is phase angle difference between the voltage and current phasors in purely capacitive circuits? 2
8. A 3-phase, 440V, induction motor is wound for 4 poles and is supplied from 50Hz supply system. Calculate the speed of the motor when slip is 5%. 4
9. Write condition for series resonance. 2
10. Write applications of synchronous motor. 4

SECTION B

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1. Attempt any three of the following: Marks CO
1. Derive the relationship in delta and star connected systems? 10 1
2. Derive the expression for the average power in a single phase purely Resistive circuit. Also draw the Phasor diagram and waveform diagram for this circuit. 10 2
3. An 1100/110V, 22KVA, 1ø transformer has primary resistance and reactance 4O and 6O respectively. The secondary resistance and reactance are 0.04O and 0.065 O respectively. Calculate (i) Equivalent resistance and reactance of secondary referred to primary. (ii) Total resistance & reactance referred to primary. (iii) Equivalent resistance and reactance of primary referred to secondary. (iv) Total copper loss 10 3
4. Derive and explain torque-slip Characteristics of 3-phase Induction motor. 10 4

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5. Explain (i) MCB (ii) ELCB (iii) MCCB 10 5

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SECTION C

1. Attempt any one part of the following: Marks CO
1. Determine current through 2O resistor using Thevenin theorem. 10 1
   

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