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: i) Question paper consists of Two parts, Part A and Part B.

ii) Part A contains 10 Multiple Choice Questions of 1 Mark each.

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iii) Part B contains 5 Questions of 12 Marks each. There is internal choice in each question.

PART-A

1. Answer all the following questions.

1. 1. The resistance of a conductor varies inversely as
      1. Length
      2. Area
      3. Temperature

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      4. Resistivity
   2. The value of form factor is
      1. 1.11
      2. 1.22
      3. 1.33

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      4. 1.44
   3. Which of the following is a rotating electrical machine?
      1. Transformer
      2. Autotransformer
      3. DC Machine

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      4. Welding machine
   4. The full form of MCB is
      1. Miniature Circuit Board
      2. Minimum Circuit Breaker
      3. Miniature Circuit Breaker

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      4. Minimum Circuit Board
   5. The power factor of pure resistive circuit is
      1. Zero
      2. Unity
      3. Lagging

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      4. Leading
   6. The EMF equation of transformer is
      1. 4.44fNF_m
      2. 4fNF_m
      3. 1.11fNF_m

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      4. 1fNF_m
   7. The primary winding of a transformer
      1. Always low voltage winding
      2. Always high voltage winding
      3. Either low voltage or high voltage winding

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      4. None
   8. The power factor of the synchronous motor is
      1. Unity
      2. Lagging
      3. Leading

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      4. All the above
   9. Moving iron instruments are generally used
      1. For DC quantities
      2. For AC quantities
      3. Both AC and DC quantities

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      4. For standard purposes
   10. Which of the following is the application of DC series motor?
       1. Lathe machine
       2. Traction
       3. Pumps

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       4. Generators

PART-B

2. (a) State and explain Kirchhoff’s Laws.

(OR)

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(b) Three resistors of 2O, 3O and 6O are connected in parallel. A current of 12 A is fed to this combination. Find the current flowing through each resistor.

3. (a) Define RMS value, Average value, Form factor and Peak factor of an alternating quantity.

(OR)

(b) Explain the working of single phase AC Transformer with neat diagrams.

4. (a) Explain the constructional details of DC machine.

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(OR)

(b) Explain the principle of operation of a DC motor.

5. (a) Derive the EMF equation of a single phase transformer.

(OR)

(b) Explain the different types of losses occurring in a transformer.

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6. (a) Explain the construction and working principle of moving iron instrument.

(OR)

(b) Explain the working principle of synchronous motor.

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