FUNDAMENTAL OF ELE. & ELO. ENGG. (2420103) 2021 PYQ

Fundalmental of Electrical & Electronics Engineering 2021 (OLD) PYQ.

FEEE2021PYQ

Choose the most suitable answer from the following options: - (1*20=20)

(i) Which one of the following is used as an active device in electronic circuits?

(a) Transformer

(b) Electric heater

(d) Loudspeaker

(ii) Tow wires A and B are of the same material with length l and 2l have radius r and 2r respectively. The ratio of their specific resistance

(a) 1:1

(b) 1:2

(d) 1:8

(iii) In an intrinsic semiconductor

(a) There are no holes in the material

(b) The number of holes is too small in the material

(d) There are no electrons in the material

(iv) The emitter of a transistor is generally doped the heaviest because it

(a) Has to dissipate maximum power

(b) Has to supply the charge carriers

(d) Must possess low resistance

(v) A practical current source is represented by.

(a) A resistance in series with an ideal current source

(b) A resistance in Parallel with an ideal current source

(d) None of these

(vi) An ideal op-amp is an ideal

(a) Voltage controlled current source

(b) Voltage controlled voltage source

(d) Current controlled voltage source

(vii) Op-amps have become very popular because

(a) They are very cheap

(b) They are extremely small in size

(d) The are available in different packages

(viii) The output of a AND gate is high if

(a) Both inputs are low

(b) One input is high and the other is low

(d) None of these

(ix) Which of the following Boolean algebra rules is correct?

(a) A .A = 1

(b) A + AB = A + B

(d) A(A+B) = B

(x) Two capacitors each having capacitance C and breakdown voltage V are joined in series. The capacitance and breakdown voltage of the combination will be

(a) 2C and 2V

(b) C/2 and V/2

(d) C/2 and 2V

(xi) According to Faraday’s law of electromagnetic induction an emf is induced in a conductor whenever it

(a) Lies in a magnetic field

(b) Lies perpendicular to the magnetic field

(d) Moves parallel to the direction of magnetic field

(xii) If a copper conductor is moved across a magnetic field

(a) The wire will become magnetic

(b) A voltage will be induced in the wire

(d) Nothing will happen

(xiii) The area of hysteresis loop is a measure of

(a) Magnetic flux

(b) Permeance

(d) Energy loss per cycle

(xiv) The rms value of a sine wave is 100A. Its peak value is

(a) 70.7 A

(b) 141 A

(d) 282.8 A

(xv) Power factor of the following circuit will be zero

(a) Resistive

(b) Inductive

(d) Both (b) and (c)

(xvi) The current through a series RLC circuit under resonance condition will be

(a) V/R

(b) V/x_c

(d) None of these

(xvii) The primary and secondary windings of a power transformer always have

(a) A common magnetic circuit

(b) Separate magnetic circuits

(d) Same number of turns

(xviii) If rated dc voltage is applied instead of ac to the primary of a transformer

(a) Secondary of transformer will burn

(b) Primary of transformer will burn

(d) There will be no secondary voltage

(xix) An auto-transformer is preferred over an ordinary two winding transformer due to

(a) Safety in operation

(b) Availability of taps on the secondary

(d) None of the above

(xx) A 3-phase synchronous motor has

(a) High starting torque

(b) No starting torque

(d) Low starting torque

Group:-"B"

➥ Answer all Five Questions: - (5*4=20)

2. What is the basis for classifying a material as a conductor, semiconductor or an insulator?

How dose a transistor differ from a semiconductor diode? Why collector is made than emitter and base?

3. Write the ideal characteristics of OP – AMP.

Define magnetic hysteresis and explain hysteresis loop.

4. Explain lenz’s law and faraday’s laws of electro-magnetic induction

What is meant by self and mutual inductances? Explain.

5. Define the following terms pertaining to ac wave:

a) Amplitude

b) Rms value

c) Frequency

d) Phase

What do you understand by phasor representation of alternating quantity? What is an alternating quantity

6. What are the disadvantages of low power factor? How is low power factor improved?

Describe the construction and principle of operation of a single phase transformer.

Group:- "C"

➥ Answer all Five Questions: - (5*6=30)

7. Discuss analogy between electric and magnetic circuits. On what factors does the magnetic reluctance depend?

What is called input offset voltage and output offset voltage of an op-amp? What are practical op-amp parameters?

8. What are Boolean algebra and Boolean expression? What are the fundamental properties of Boolean algebra?

What is meant by leakage factor? Give major points of difference between electric and magnetic circuits analogy

9. What do you understand by statically and dynamically induced emf? Write down differences between them with examples.

Explain why the phasor of voltage across the inductor leads the current by 90^oand the phasor of voltage across capacitor lags its current by 90^o.

10. Develop the expression for the mean power consumed over a cycle of a single phase sine wave supply delivering power to a load comprising a resistance R in series with an inductor L.

Deduce the relationship between phase and line voltages and currents in a 3-phase star-connected circuit. Draw phasor diagram to establish it.

11. Explain the difference between a step – up and step- down transformer. Derive the emf equation of a transformer.

Write notes on :-

(a) Differentiator

(b) Star-Delta transformation

*****

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PYQ – FUNDAMENTAL OF ELE. & ELO. ENGG. (2420103) | SEMESTER 1ST AND 2ND (1ST YEAR) | Year 2021

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