B.Tech I Semester (R18) Regular Examinations November, 2018

BASIC ELECTRICAL ENGINEERING

(Common to CE, ME & ECE)

Time: 3 Hours Max. Marks: 70

Note: 1. Question paper consists: Part-A and Part-B.
2. Answer ALL the question in Part-A.
3. Answer any THREE questions from Part-B

PART-A (22 Marks)

1. 1. State Ohm’s law. (2M)

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   2. Define RMS value. (2M)
   3. Define Form factor and Peak factor. (2M)
   4. Write the principle of operation of DC motor. (2M)
   5. Write the principle of operation of Transformer. (2M)
   6. Write the different types of measuring instruments. (2M)

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   7. What is the necessity of earthing? (2M)
   8. Write the applications of DC motors. (2M)
   9. Write the applications of transformers. (2M)
   10. Define fuse and its function. (2M)
   11. What is meant by circuit breaker? (2M)

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PART-B (48 Marks)

2. a) State and explain Kirchhoff’s laws. (8M)
   b) A 10 Ω resistor, a 15 Ω resistor and a 20 Ω resistor are connected in parallel across a 220V source. Determine: (8M)
   i) the total current delivered by the source.
   ii) the current in each resistor.

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3. a) Define the terms instantaneous value, average value and RMS value of an alternating quantity. (8M)
   b) Derive the RMS value of sinusoidal alternating quantity. (8M)
4. a) Explain the working principle of a single phase transformer and derive the EMF equation. (8M)
   b) Explain the different types of DC generators. (8M)
5. a) Derive the torque equation of DC motor. (8M)
   

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   b) Explain the construction details of DC Machines. (8M)
6. a) Explain the working principle of Moving Iron Instruments. (8M)
   b) Explain about different types of Earthing. (8M)

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