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Type of Announcement : Model Question B.Tech Examination
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Subject Name : Basic Electrical Engineering Code No. EN010 108 Time - 3 hrs Marks - 100
Part -A
I. Answer all questions. Each question carries 3 marks :
1. Write the equation for converting a Delta connected network to equivalent star connected network and vice versa.
2. Define RMS value, Average value and Form factor.
3. Explain the necessity of starter in a DC motor.
4. What are the different types of single phase induction motor?
5. Distinguish between a feeder, distributor and service mains.

Part B
II. Answer all questions. Each question carries 5 marks :
6. Derive the expression for the RMS value of a sinusoidal voltage.
7. Derive the emf equation of single phase transformer.
8. A50Hz , 4 pole 3phase Induction motor has a rotor current of frequency 2Hz.Determine i)the slip and ii) the speed of the motor.
9. What are the requirements of a good lighting system?
Part C
10. a) State and Explain Kirchoff’s laws.
11.a)Distinguish between electric and magnetic circuit.
b) A magnetic core in the form of closed ring has a mean length of 20cm and a cross section of 1cm².The µr of iron is 2400.What current will be needed in a coil of 2000 turns uniformly wound round the ring to create a flux of 0.2mWb in the iron.If an air gap of 1mm is cut through the core perpendicular to the direction of this flux , what will be the current needed to maintain the small flux in the gap?
12.a) Distinguish between statically induced emf and dynamically induced emf.
b) From the fundamentals derive an expression for the average power in an ac circuit.
13. a)Why a single phase induction motor is not self starting?
b) Describe the different rotor constructions in an alternator.
14. a) Describe the various non conventional energy sources

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