Other Bachelor Degree- BASIC ELECTRICAL ENGINEERING(Karunya University, Coimbatore-2010)
Saturday, 24 August 2013 07:46anudouglas
Karunya University
(Karunya Institute of Technology and Sciences)
(Declared as Deemed to be University under Sec.3 of the UGC Act, 1956)
End Semester Examination – November/December 2010
Subject Title : BASIC ELECTRICAL ENGINEERING Time : 3 hours
Subject Code: 09EE101 Maximum Marks: 100
Answer ALL questions
PART – A (10 x 1 = 10 MARKS)1. Voltage across a __________ circuit is same.
2. The equation for temperature co-efficient of resistance is given by α0 =__________.
3. The magnetic flux density is given by __________ .
4. Coefficient of coupling between two magnetically coupled coils is given by __________.
5. The power factor of a pure inductive circuit is __________.
6. The lines feeding the power from the distribution transformer to the distributors are called__________.
7. The transformer works on the principle of __________.
8. The e.m.f. equation of a d.c. generator is given by __________.
9. Write any two disadvantages of PMMC meter.
10. What is earthing?
PART – B (5 x 3 = 15 MARKS)
11. State Ohm’s Law. Mention its limitations.
12. Write the Laws of Electromagnetic Induction briefly.
13. Give any five comparisons between overhead and underground distribution systems.
14. Write few applications of DC series motor and DC shunt motor.
15. What is opposing torque? What are the components of opposing torque?
PART – C (5 x 15 = 75 MARKS)
16. a. Define Kirchhoff’s Laws and illustrate each of them using an example. (8)
b. Two resistors 12 W and 6 W are connected in parallel and this combination is connected in series with a 6.25ohms resistance and a battery E as given below in the figure. Determine the emf of the battery if potential difference across 6 ohms resistance is 6 volts. (7)
.
(OR)
17. Discuss about star to delta and delta to star transformations with relevant diagrams.
[P.T.O]
18. a. Define the following parameters: (6)
i. Magnetic Flux Density. ii. Reluctance. iii. Permeance.
b. Compare magnetic circuits with electric circuits. (9)
(OR)
19. a. Discuss about self Inductance and mutual inductance in detail. (8)
b. A coil has a self inductance of 30 mH. Calculate the emf in the coil when the current in the coil (7)
i. Increases at the rate of 300 A/s
ii. Raises from 0 to 10 A in 0.06 seconds.
20. How is electrical energy generated in a Thermal Power Station? Explain in detail with neat diagram.
(OR)
21. a. Derive the RMS value, average value, form factor and peak factor of a sinusoidal alternating current quantity. (10)
b. Draw the single line diagram of a power system. (5)
22. Explain the principle, construction and working of a single phase transformer with neat diagram.
(OR)
23. Explain the principle, construction of a DC generator with a neat diagram.
24. With a neat diagram, explain the construction and working principle of moving coil instruments.
(OR)
25. a. How do you classify the electrical measuring instruments? (5)
b. Explain with neat diagram fluorescent lamp wiring. (10)
| Earning: ₹ 0.00/- |
