PYQ – FUNDAMENTAL OF ELE. & ELO. ENGG. (2420103) | SEMESTER 1ST AND 2ND (1ST YEAR) | Year 2022

Fundamental of Electrical and Electronics Engineering 2022 (OLD) PYQ.

Group A

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

(i) A device having characteristics very close to that of an ideal voltage source is

(a) vacuum diode

(b) Zener diode

(c) transistor  

(d) FET

(ii) An atom is said to be ionized when any one of its orbiting electron

(a) is raised to an higher orbit

(b) jumps from one orbit to another

(c) comes to the ground state

(d) is completely removed

(iii) Resistance of a wire always increases if

(a) temperature is reduced

(b) temperature is increased

(c) number of free electrons available become less

(d) number of free electrons available become more

(iv) A dependent source

(a) may be a current source are voltage source       

(b) is always a voltage source

(c) is always a current source

(d) neither a current source nor a voltage source 

(v) An ideal op-amp is an ideal

(a) voltage controlled current source

(b) voltage controlled voltage source

(c) current controlled current source  

(d) current controlled voltage source

(vi) For a step input, the output of an integrator is

(a) a pulse

(b) a triangular wave form

(c) a spike

(d) a ramp

(vii) The op-amp can amplify

(a) AC signal only

(b) DC signal only

(c) Both a and dc signals

(d) none of the above

(viii) A logic gate is an electronic circuit which

(a) operator on binary algebra

(b) performs arithmetic and logic functions

(c) allows how of electrons only in one direction

(d) alternates between 0 and 1 values

(ix) Three Boolean operators are

(a) NOT, OR, AND

(b) NOT, NAND, OR

(c) NOR, OR, NOT

(d) NOR, NAND, NOT

 
(x) The magnetic materials exhibit the property of magnetization due to 

(a) spit of nucleus

(b) spit of electrons

(c) orbital motion of electrons

(d) all of the above

 
(xi) The conductance of electrical circuit is analogous in magnetic circuit by

(a) flux

(b) reluctance

(c) permeance

(d) relative permeability

(xii) The principle of dynamically induced emf is utilized in a

(a) choke

(b) transformer

(c) thermocouple

(d) generator

(xiii) The unit of inductance is

(a) henry

(b) Volt-Second/A

(c) Wb/A

(d) all of the above

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

(a) resistive

(b) inductive

(c) capacitive

(d) both b and c

 
(xv) For delta connected circuit the correct relationship is

(a) V_L = V_ph

(b) I_ph x  = I_L

(c)  V_L = I_L x

(d) both a and b

(xvi) In a purely resistive circuit, the average power P _av is ----------- the peak power P _max  

(a) double

(b) one-half of

(c) one-fourth

(d) equal to

(xvii) In an ordinary transformer which of the following does not change

(a) voltage

(b) current

(c) frequency

(d) all of the above

(xviii) The iron core in a transformer provides a --------- path to the main flux.

(a) low reluctance

(b) high reluctance

(c) low resistance

(d) high conductivity

(xix) When the mechanical power developed by a dc motor maximum?

(a) Back emf is equal to applied voltage  

(b) Back emf is equal to zero

(c) Back emf is equal to half the applied voltage  

(d) none of the above

(xx) Torque developed in a dc motor depends upon

(a) magnetic field  

(b) current flowing through the armature conductors

(c) active length of the conductors

(d) all of the above

 

Group:-"B"

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

 

2. What is a PN- junction diode? Explain the depletion layer in a PN-junction. 

OR

 Distinguish between independent and dependent voltage and current sources.

 

3. Why is an op-amp used most commonly as an integrator and not as a differentiator? 

OR

 Define universal gate with suitable example.

 

4. Derive an expression for force acting on a current carrying conductor placed in a magnetic field.   

OR

 State and explain Faraday’s Laws of electro-magnetic induction.

 

5. Give comparative statements of similarity and dissimilarity between Alternating current and direct current. 

OR

 Derive an expression for the force between two parallel current carrying conductors.

 

6. Derive the expression for the current in the circuit in case of A. C. voltage applied to resistance and capacitance in series.  

OR

 Explain the principle of working of a transformer with suitable diagram.

 

Group:- "C"

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

 

7. What do you mean by emitter, base and collector of a transistor? With neat sketch of circuit explain biasing of a transistor.  

OR

 Describe Boolean algebra. Write Boolean algebraic theorems of ‘OR’ Laws and ‘AND’ laws.

 

8. What do you understand by self and mutual inductance of a coil? Describe the working principle of a dc generator. 

OR

 Discuss on op-amp works as an amplifier. Give a list of linear applications of operational amplifiers.

 

9. Discuss analogy between electric and magnetic circuits. Define MMF and reluctance.  

OR

 Define the term RMS value, Average value, form factor and peck factor.

 

10. Write the name of different types of D. C motor and explain its characteristics.  

OR

 State and explain Laws of resistance. On what factors do the resistance of a conductor depends?

 

11. Derive the relation between applied voltage and the current in case of AC circuit containing pure capacitance with phasor diagram. 

OR

 Write notes on :-

       i.  Auto transformer

     ii.  CMOS

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