Question Paper: Basic Electricals & Electronics Engg. Question Paper - December 2015 - First Year Engineering (Set A) (Semester 1) - Rajiv Gandhi Proudyogiki Vishwavidyalaya (RGPV)
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Basic Electricals & Electronics Engg. - December 2015

RGPV First Year Engineering (Set A) (Semester 1)

Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary
1(a) Define RMS and average value of an intern sinsusoidal 2 marks

1(b) Draw VI characteristics of ideal and practical woltage source 2 marks

1(c) Write the statement of superposition theorem. 3 marks

Solve any one question from Q.1(d) &Q.1(e)

1(d) Define Active, Reactive and apparent power and draw power triangle to establish a relation among them. 7 marks

1(e) For the circuit shown in the figure, determine the current theory 5Ω resistor using thevenins theorem.
7 marks

2(a) Define
i) MMF
ii) Magnetic field intensity
2 marks

2(b) Write the Faraday's laws of electromagnetism. 2 marks

2(c) Write the basic principle of working of a single phase transformer. 3 marks

Solve any one question from Q.2(d) &Q.2(e)

2(d) Write a short note on the losses in a transformer 7 marks

2(e) Draw the phasor diagram of a single phase transformer working at lagging p.f.load. 7 marks

3(a) In a d.c. machines, write the basic function of following parts.
i) Commutator
ii) Brushes.
2 marks

3(b) What is meant by synchronous speed in synchronous machine? 2 marks

3(c) Write the definition and relation for slip speed and slip frequency. 3 marks

Solve any one question from Q.3(d) &Q.3(e)

3(d) Draw and explain the Torque-Slip characteristics of 3 phase Induction Motor. 7 marks

3(e) Classify self excited D.C. generators and draw their connection diagram neatly. 7 marks

4(a) What is EX-NOR gate? Explain with the help of its truth table. 2 marks

4(b) Draw the circuit diagram and truth table for half adder. 2 marks

4(c) State and explain DeMorgan's theorem. 3 marks

Solve any one question from Q.4(d) &Q.4(e)

4(d) Explain the operation of clocked RS Flip-flop with the help of logical diagram and truth table. 7 marks

4(e) Convert the following:
i) (1001010.0101)2=(   )10
ii) (AEFF)16=(   )10
iii) (374.37)10=(   )16
iv) (36.125)8=(   )10
v) (17173.71)8=(   )16
vi) (25.625)10=(   )2
vii) (110101.101)2=(   )8
7 marks

5(a) What are intrinsic and extrinsic semiconductors? 2 marks

5(b) Explain how BJT can be used as a switch. 2 marks

5(c) Draw and explain the VI characteristics of semiconductor diode. 3 marks

Solve any one question from Q.5(d) &Q.5(e)

5(d) Explain the working of transistor in C.E mode and draw input and output characteristics of it. 7 marks

5(e) Describe the similarities and dissimilarities in the operation of PNP and NPN Transistors. 7 marks

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