B.Tech I Year I Semester (R20) Regular Examinations December-2020

BASIC ELECTRICAL ENGINEERING

(Common to CSE, ECE & IT)

Time: 3 Hours Max. Marks: 70

Note: 1. Question paper consists: Part-A and Part-B.

--- Content provided by⁠ FirstRanker.com ---

2. Answer ALL the questions in Part-A

3. Answer any SEVEN questions from Part-B

PART-A (14 Marks)

1. 1. State Ohm’s Law. (2M)
   2. Define RMS value. (2M)
   3. Define power factor. (2M)

   --- Content provided by⁠ FirstRanker.com ---

   4. List any two applications of DC motor. (2M)
   5. Define transformer ratio. (2M)
   6. What is the function of earthing? (2M)
   7. Write any two advantages of LED lamps. (2M)

--- Content provided by‌ FirstRanker.com ---

PART-B (56 Marks)

2. State and explain Kirchhoff’s Laws. (7M)
3. Calculate the current through 4O resistor using nodal analysis for the circuit shown in below figure. (7M)
   (Note: Replace '#' with actual image source if available)
4. Derive the EMF equation of a single-phase transformer. (7M)
5. Explain the constructional details of a DC machine with neat sketches. (7M)

--- Content provided by​ FirstRanker.com ---

6. Explain the working principle of single-phase induction motor. (7M)
7. A 200/400 V, 50 Hz single-phase transformer gave the following test results: (7M)
   OC test: 200 V, 0.7 A, 70 W on LV side
   SC test: 15 V, 10 A, 85 W on HV side
   Determine the parameters of the equivalent circuit referred to LV side.

--- Content provided by⁠ FirstRanker.com ---

8. Explain the different types of wiring. (7M)
9. Explain the working principle of different types of lamps. (7M)
10. Explain the working principle of a mega-watt hydroelectric power plant with a neat sketch. (7M)
11. FirstRanker.com What is the necessity of earthing? Explain different types of earthing. (7M)

FirstRanker.com

--- Content provided by⁠ FirstRanker.com ---