Download GTU BE/B.Tech 2019 Winter 3rd Sem New 2130105 Electrical Machines And Electronics Question Paper

Enrolment No.

Subject Code: 2130105

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER- III (New) EXAMINATION — WINTER 2019

Subject Name: Electrical Machines & Electronics

Time: 02:30 PM TO 05:00 PM

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. 1. Explain the DeMorgan’s theorems in Boolean algebra. (03)
   2. Compare Lap and Wave type Winding (04)
   3. Explain the constructional features of (i) Current Transformer (ii) Potential Transformer and List the advantage and disadvantage of the instrument transformer (07)

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2. 1. List and Explain any three parts of a D.C. Machine. (03)
   2. Derive Torque equation of D.C. Motor. (04)
   3. Sketch and Explain the Torque- Armature Current, Speed- Armature Current and Speed- Torque characteristics of D.C. Series Motor. (07)

   OR

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   1. Draw and Explain External and Internal Characteristics of D.C. Generator. (07)
3. 1. Explain the term Slip of Induction Motor. (03)
   2. List the difference between Squirrel cage and Slip ring Rotor. (04)
   3. Discuss the need of a starter for a 3 — phase Induction motor. Write the names of various starters used for a 3 — phase Induction Motor. explain any one. (07)

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   OR

   1. Draw and compare Shell type, Core type and Berry type transformer. (03)
   2. Derive EMF equation of a transformer. (04)
   3. What is Power factor? Discuss the effect-of low power factor and mention their method of Improvement. (07)

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4. 1. Explain the term Armature Reaction. (03)
   2. Give Difference between Salient and Smooth Cylindrical Type of Rotor (04)
   3. Explain Construction of 3'~ Phase Alternator with figure. (07)

   OR

   1. What is Substation? Show Classification of Substation. (03)

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   2. Write Short notes on equipments used in substations. (04)
   3. Differentiate between Overhead and Underground System with merits and demerits. (07)
5. 1. Explain Pole Mounted Substations. (03)
   2. Draw Pin diagram of 8085 Microprocessor. (04)

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   3. Explain and Compare Half wave and Full wave rectifier. (07)

   OR

   1. State ideal Characteristics of an Op-amp. (03)
   2. Define given terms (1) Inc (2) Vbc (3) Ripple Factor (4) Rectifier Efficiency. (04)
   3. Draw Block diagram of 8085 Microprocessor. (07)

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Date: 3/12/2019

Total Marks: 70

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