MCQ Quiz on Fundamental of Electrical & Electronics Engineering

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Unit- 1 : Electric and Magnetic Circuits

/20

1 votes, 5 avg

301

Created on October 13, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-1.1 : Concept of Passive Components: Resistors, Capacitors, Inductors

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 20

Category: Basic Electricity

1. Calculate the ratio of the resistivity of 2 wires having the same length and same resistance with area of cross section 2m² and 5m² respectively.

A) 2:7

B) 2:5

C) 7:5

D) 5:7

2 / 20

Category: Basic Electricity

2. A choke coil is a coil having-

A) High inductance negligible resistance

B) High inductance high capacitance

C) Low resistance high capacitance

D) Low inductance high resistance

3 / 20

Category: Basic Electricity

3. The insulating medium between the two plates of capacitor is known as __________

A) Capacitive medium

B) Conducting medium

C) Electrode

D) Dielectric

4 / 20

Category: Basic Electricity

4. The resistance of straight conductor is independent of-

A) Shape of cross-section

B) Material

C) Cross-sectional area

D) Temperature

5 / 20

Category: Basic Electricity

5. Calculate the value of energy stored in an inductor if the value of inductance is 10H and 2A of current flows through it.-

A) 20 J

B) 90 J

C) 15 J

D) 60 J

6 / 20

Category: Basic Electricity

6. The Inductor doesn’t allow sudden changes in

A) Current

B) Resistance

C) Voltage

D) Inductance

7 / 20

Category: Basic Electricity

7. Color code for 1 ohm +-10% resistor is

A) Black Brown Black Golden

B) Brown Black Golden Golden

C) Black Brown Black Silver

D) Brown Black Golden Silver

8 / 20

Category: Basic Electricity

8. In a pure inductive circuit current is

A) Leads by voltage by 90°

B) Leads by voltage by 0°

C) Lags by voltage by 0°

D) Lags behind Voltage by 90°

9 / 20

Category: Basic Electricity

9. A 2 micro farad capacitor connected across 10 volt DC. Value of current is –

A) Infinity

B) 0.2 A

C) 5 A

D) 0 A

10 / 20

Category: Basic Electricity

10. The units for inductance is _________ and capacitance is ___________

A) Coulomb, Faraday

B) Henry, Faraday

C) Faraday, Henry

D) Henry, Coulomb

11 / 20

Category: Basic Electricity

11. The expression for energy of an inductor

A) ½ LI

B) ½ LI^2

C) ½ L^2.I

D) L/2I

12 / 20

Category: Basic Electricity

12. Frequency of Direct Current is

A) 50 kHz

B) 50 Hz

C) 40 Hz

D) 0 Hz

13 / 20

Category: Basic Electricity

13. The capacitor doesn’t allow sudden changes in

A) Voltage

B) Capacitance

C) Current

D) Resistance

14 / 20

Category: Basic Electricity

14. A wire has the same resistance as the one given in the figure. Calculate its resistivity if the length of the wire is 10m and its area of cross section is 2m.

A) 8 ohm-meter

B) 8 kilo ohm-meter

C) 16 kiloohm-meter

D) 16 ohm-meter

Hints:

From the given circuit, R=V/I = 200/5 = 40 ohm.
Resistivity= Resistance x Area of cross section/ Length of the wire.

Resistivity= 40 x 2/10= 8 ohm-meter.

15 / 20

Category: Basic Electricity

15. Which, among the following is a unit for resistivity?

A) ohm/meter^2

B) ohm/meter

C) ohm-meter^2

D) ohm-meter

16 / 20

Category: Basic Electricity

16. A wire of length 2m and another wire of length 5m are made up of the same material and have the same area of cross section, which wire has higher resistance?

A) The 2m wire has higher resistance

B) The 5m wire has higher resistance

C) The value of resistance cannot be determined from the given data

D) Both have equal resistance

17 / 20

Category: Basic Electricity

17. Which of the following statements are true with regard to resistance?

A) Resistance is directly proportional to an area of cross section of the wire

B) Resistance is inversely proportional to the resistivity of the wire

C) Resistance is inversely proportional to the length of the wire

D) Resistance is directly proportional to a length of the wire

18 / 20

Category: Basic Electricity

18. Which of the following statements are true with regard to resistivity?

A) Resistance does not depend on the temperature

B) Resistivity depend on the length

C) Resistivity depend on area of cross section

D) Resistance depends on the temperature

19 / 20

Category: Basic Electricity

19. If a capacitor is connected with DC supply, it will act as –

A) Open circuit

B) A normal capacitor as in AC

C) A resistor

D) A short circuit

20 / 20

Category: Basic Electricity

20. Materials which easily allow the passage of electric current are known as ______

A) Semi-conductors

B) Dielectrics

C) Insulators

D) Conductors

Your score is

The average score is 40%

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/20

0 votes, 0 avg

Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-1.2 : Different types of signal waveforms: DC/AC, voltage/current, periodic/non-periodic

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 20

Category: Basic Electricity

1. A phasor represents

A) The phase angle

B) The magnitude and a quantity direction

C) The width of a quantity

D) The magnitude of a quantity

2 / 20

Category: Basic Electricity

2. Average value of a sine wave is 0.707 times the peak value

A) True

B) False

3 / 20

Category: Basic Electricity

3. How many degrees are there in π/3 rad?

A) 180°

B) 27°

C) 6°

D) 60°

4 / 20

Category: Basic Electricity

4. A signal with a 400 μs period has a frequency of

A) 250 Hz

B) 25,000 Hz

C) 2,500 Hz

D) 400 Hz

5 / 20

Category: Basic Electricity

5. The average half-cycle value of a sine wave with a 40 V peak is

A) 14.14 V

B) 25.48 V

C) 6.37 V

D) 50.96 V

6 / 20

Category: Basic Electricity

6. If the peak of a sine wave is 13 V, the peak-to-peak value is

A) 13 V

B) None of the above

C) 6.5 V

D) 26 V

7 / 20

Category: Basic Electricity

7. A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is

A) 50%

B) 100%

C) 25%

D) 1%

8 / 20

Category: Basic Electricity

8. A 20 kHz pulse waveform consists of pulses that are 15 μs wide. The duty cycle is

A) 30%

B) 100%

C) 1%

D) Cannot be determined

Hints :

Frequency = 1/t = 1/15x10^-6 = 66666.67 Hz = 66.66 kHz

Pulse waveform = 20 kHz

Duty cycle = Pulse waveform/frequency = 20/66.66 = 0.3x100% = 30%

9 / 20

Category: Basic Electricity

9. A saw-tooth wave has a period of 10 ms. Its frequency is

A) 1,000 Hz

B) 100 Hz

C) 50 Hz

D) 10 Hz

Hints:

Frequency = 1/time period

10 / 20

Category: Basic Electricity

10. If a sine wave goes through 10 cycles in 20 μs, the period is

A) 100 μs

B) 4 μs

C) 2 μs

D) 20 μs

11 / 20

Category: Basic Electricity

11. The instantaneous value is the voltage or current value of a waveform at its peak

A) True

B) False

12 / 20

Category: Basic Electricity

12. If the rms current through a 4.7 kΩ resistor is 4 mA, the peak voltage drop across the resistor is

A) 18.8 V

B) 4 V

C) 26.6 V

D) 2.66 V

13 / 20

Category: Basic Electricity

13. When a sine wave has a frequency of 100 Hz in 12 s it goes through

A) 1/100 cycle

B) 120 cycles

C) 12 cycles

D) 1,200 cycles

14 / 20

Category: Basic Electricity

14. Periodic is characterized by a repetition at fixed time intervals

A) False

B) True

15 / 20

Category: Basic Electricity

15. A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is

A) 39.6 mA

B) 16 mA

C) 22.6 mA

D) 45.12 mA

16 / 20

Category: Basic Electricity

16. The unit of frequency is the hertz

A) True

B) False

17 / 20

Category: Basic Electricity

17. One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is

A) None of the above

B) 0°

C) 45°

D) 40°

18 / 20

Category: Basic Electricity

18. Amplitude is the maximum value of a voltage or current

A) False

B) True

19 / 20

Category: Basic Electricity

19. If the rms voltage drop across a 15 kΩ resistor is 16 V, the peak current through the resistor is

A) 10 mA

B) 1.5 mA

C) 1 mA

D) 15 mA

20 / 20

Category: AC Fundamental

20. The length of a phasor represents the amplitude

A) False

B) True

Your score is

The average score is 42%

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/16

0 votes, 0 avg

Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-1.3 : Voltage/current sources: Ideal/non-ideal ,independent/dependent , source transformation

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 16

Category: Basic Electricity

1. In a _________ circuit, the total resistance is greater than the largest resistance in the circuit.

A) Series

B) Neither series nor parallel

C) Either series or parallel

D) Parallel

2 / 16

Category: Basic Electricity

2. Active circuit have -

A) one current source

B) none of these

C) one voltage source

D) either a or b

3 / 16

Category: Basic Electricity

3. What happens to the current in the series circuit if the resistance is doubled?

A) It becomes double its original value

B) It becomes zero

C) It becomes half its original value

D) It becomes infinity

4 / 16

Category: Basic Electricity

4. Ideal voltage source has-

A) Infinity internal resistance

B) Low internal resistance

C) High internal resistance

D) Zero internal resistance

5 / 16

Category: Basic Electricity

5. What is the voltage measured across a series short?
a) b) c) d)

A) Infinite

B) The value of the source voltage

C) Zero

D) Null

6 / 16

Category: Basic Electricity

6. Ideal voltage source has-

A) Infinity internal resistance

B) Zero internal resistance

C) High internal resistance

D) Low internal resistance

7 / 16

Category: Basic Electricity

7. In a series circuit, which of the parameters remain constant across all circuit elements such as resistor, capacitor and inductor etc?

A) Neither voltage nor current

B) Current

C) Both voltage and current

D) Voltage

8 / 16

Category: Basic Electricity

8. In a parallel circuit, with a number of resistors, the voltage across each resistor is ________

A) Is divided equally among all resistors

B) Is divided proportionally across all resistors

C) The same for all resistors

D) Is zero for all resistors

9 / 16

Category: Basic Electricity

9. Many resistors connected in series will?

A) Divide the voltage proportionally among all the resistor

B) Divide the current proportionally

C) Increase the source voltage in proportion to the values of the resistors

D) Reduce the power to zero

10 / 16

Category: Basic Electricity

10. Batteries are generally connected in______

A) Either series or parallel

B) Parallel

C) Neither series nor parallel

D) Series

11 / 16

Category: Basic Electricity

11. If there are two bulbs connected in series and one blows out, what happens to the other bulb?

A) The other bulb continues to glow with the same brightness

B) The other bulb glows with increased brightness

C) The other bulb also burns out

D) The other bulb stops glowing

12 / 16

Category: Basic Electricity

12. Which is the most cost efficient connection?

A) Series

B) Neither series nor parallel

C) Either series or parallel

D) Parallel

13 / 16

Category: Basic Electricity

13. The energy per unit charge is

A) Work

B) Power

C) Voltage

D) Current

Hints: Voltage v=dw/dq and its SI unit is volt

14 / 16

Category: Basic Electricity

14. In a ____________ circuit, the total resistance is smaller than the smallest resistance in the circuit

A) Either series or parallel

B) Series

C) Parallel

D) Neither series nor parallel

15 / 16

Category: Basic Electricity

15. If two bulbs are connected in parallel and one bulb blows out, what happens to the other bulb?

A) The other bulb glows with increased brightness

B) The other bulb continues to glow with the same brightness

C) The other bulb blows out as well

D) The other bulb stops glowing

16 / 16

Category: Basic Electricity

16. The current in each branch of a parallel circuit is proportional to _________

A) The amount of time the circuit

B) Proportional to the power in the circuit

C) Proportional to the value of the resistors

D) Equal in all branches

Your score is

The average score is 41%

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Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-1.4 : Simple problems on source transformation

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 16

Category: Basic Electricity

1. The voltage across the open circuit is?

A) Infinity

B) 0 V

C) 100 V

D) 90 V

2 / 16

Category: Basic Electricity

2. Find the voltage across the 6 ohm resistor

A) 27.27 V

B) 54.48 V

C) 150 V

D) 181.6 V

3 / 16

Category: Basic Electricity

3. Calculate the resistance between A and B

A) 3.56 ohm

B) 29.69 ohm

C) 7 ohm

D) 14.26 ohm

Hints:

The 1 ohm, 2 ohm and 3 ohm resistors are connected in parallel. Its equivalent resistance is in series with the 4 ohm resistor and the parallel connection of the 5 ohm and 6 ohm resistor. The equivalent resistance of this combination is 80/11 ohm. This is in parallel with 7 ohm to give equivalent resistance between A and B is 3.56 ohm.

4 / 16

Category: Basic Electricity

4. Calculate the total current in the circuit

A) 20 A

B) 11.43 A

C) 10 A

D) 15 A

Hints: The 1 ohm and 2 ohm resistor are in series which is in parallel to the 3 ohm resistor. The equivalent of these resistances (3/2 ohm) is in series with the 4 ohm and 5 ohm resistor. Total R = 21/2 ohm. I=V/R=120/(21/2)=240/21=11.43 A.

5 / 16

Category: Basic Electricity

5. If the current through x ohm resistance in the circuit is 5A, find the value of x

A) 135 ohm

B) 5 ohm

C) 12 ohm

D) 27 ohm

Hints:

R=V/I. In this circuit I=5A and V=135V. Therefore, R=135/5=27 ohm.

6 / 16

Category: Basic Electricity

6. Calculate the equivalent resistance between A and B

A) 2 ohm

B) 6 ohm

C) 4 ohm

D) 8 ohm

Hints:

R=((2+3)||5)+1.5)||4. The 2 and the 3 ohm resistor are in series. The equivalent of these two resistors is in parallel with the 5 ohm resistor. The equivalent of these three resistances is in series with the 1.5 ohm resistor. Finally, the equivalent of these resistances is in parallel with the 4 ohm resistor.

7 / 16

Category: Basic Electricity

7. What is the value of x if the current in the circuit is 5 A?

A) 25 ohm

B) 15 ohm

C) 55 ohm

D) 75 ohm

8 / 16

Category: Basic Electricity

8. Calculate the current across the 20 ohm resistor

A) 20 A

B) 6.67 A

C) 36.67 A

D) 10 A

9 / 16

Category: Basic Electricity

9. The voltage across the short is?

A) Infinity

B) 11.25 V

C) 135 V

D) Zero

Hints:

As there is no resistance i.e. directly shorted across the voltage souce, so there will be no voltage drop and infinity current will flow through the short circuit path. So voltage drop will be zero.

10 / 16

Category: Basic Electricity

10. Calculate the equivalent resistance between A and B

A) 48 ohm

B) 60 ohm

C) 15 ohm

D) 12 ohm

Hints:

5 ohm and 15 ohm are connected in series to give 20 ohm.10ohm and 20 ohm are connected in series to give 30 ohm. Now both equivalent resistances (20ohm and 30 ohm) are in parallel to give equivalent resistance 20*30/(20+30) = 12 ohm.

11 / 16

Category: Basic Electricity

11. Calculate the total resistance between the points A and B.

A) 0.48 ohm

B) 7 ohm

C) 7.67 ohm

D) 0 ohm

Hints:

1 ohm in parallel with 2 ohm give 2/3 ohm equivalent which is in series with 4 ohm and 3 ohm so total resistance between A and B = 4 + 2/3 + 3 = 23/3 = 7.67 ohm.

12 / 16

Category: Basic Electricity

12. The total resistance between A and B are?

A) 0 ohm

B) 5 ohm

C) 20 ohm

D) 80 ohm

13 / 16

Category: Basic Electricity

13. Find the current in the circuit.

A) 2 A

B) 4 A

C) 1 A

D) 3 A

14 / 16

Category: Basic Electricity

14. Voltage across the 60 ohm resistor is______

A) 48 V

B) 0 V

C) 72 V

D) 120 V

15 / 16

Category: Basic Electricity

15. Calculate the equivalent resistance between A and B

A) 10.67 ohm

B) 26.67 ohm

C) 46.67 ohm

D) 6.67 ohm

Hints:

R=20||20||20=6.67 ohm. The three 20 ohm resistors are in parallel and resistance is measured across this terminal.

16 / 16

Category: Basic Electricity

16. The currents in the three branches of a parallel circuit are 3 A, 4 A and 5 A. What is the current leaving it?

A) 12 A

B) 0 A

C) Insufficient data provide

D) The largest one among the three values

Hints:

Apply KCL and the result will be summation of 3+4+5 A = 12 A

Your score is

The average score is 39%

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Unit- 2 : Electric and Magnetic Circuits

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Created on October 13, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-2.1 : Concept of EMF, Current, Potential Difference, Power and Energy

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common for all branches

1 / 13

Category: Magnetic Circuit

1. Induced potential difference due to motion of magnet with respect to the coil is known as -

A) Electromotive difference

B) Electromotive force

C) Magnetomotive force

D) voltage

2 / 13

Category: AC Fundamental

2. Average power taken by a pure capacitor is –

A) Maximum

B) Minimum

C) Zero

D) Unity

3 / 13

Category: Basic Electricity

3. 1 coulomb charge equals the charge of –

A) 6.24×10^12 electrons

B) 6.24×10^18 electrons

C) 6.24×10^-18 electrons

D) 6.24×10^16 electrons

4 / 13

Category: Basic Electricity

4. KWh is the unit of -

A) Efficiency

B) Power

C) Energy

D) Work

5 / 13

Category: Basic Electricity

5. Insulating material can –

A) protect a open circuit between the voltage source and load

B) Protect a short circuit between two conductors

C) Conduct very large current

D) Store varying voltage

6 / 13

Category: Basic Electricity

6. In case of D.C –

A) Magnitude of current changes with time

B) Magnitude and direction remains constant

C) Magnitude and direction both change with time

D) Direction of current changes with time

7 / 13

Category: Basic Electricity

7. Electric pressure is also called –

A) Voltage

B) Resistance

C) Conductance

D) Energy

8 / 13

Category: Basic Electricity

8. S.I unit of Power is –

A) Watt

B) Joule

C) Watt-hr

D) Coulomb

9 / 13

Category: Basic Electricity

9. Instantaneous power in inductor is proportional to the –

A) Temperature of the inductor

B) Square of instantaneous current

C) Square of rate of change of current

D) Product of instantaneous current & rate of change of current

10 / 13

Category: Basic Electricity

10. S.I unit of conductance is –

A) Mho

B) Mho-m

C) Ohm

D) Ohm-m

11 / 13

Category: Basic Electricity

11. Three lamps are connected in parallel across the voltage source. What happen if one lamp will burn out? –

A) no bulb will glow

B) The other two lamps will glow

C) Total current in the circuit will increase

D) all the three will glow

12 / 13

Category: Basic Electricity

12. Current & Potential Difference both can be measured using –

A) Voltmeter

B) Multimeter

C) Ohmmeter

D) Ammeter

13 / 13

Category: Basic Electricity

13. The flow of electron in solids is due to –

A) Atoms

B) positive charges

C) electrons & ions

D) electrons

Your score is

The average score is 53%

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/20

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Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-2.2 : M.M.F, magnetic force, permeability, hysteresis loop, reluctance, leakage factor, BH curve and hysteresis loss, eddy current loss. Analogy between electric and magnetic circuits

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 20

Category: Magnetic Circuit

1. Which of the following is unit less?

A) Moment of Magnet

B) Magnetic susceptibility

C) Permeability

D) Permittivity

2 / 20

Category: Magnetic Circuit

2. Magnetic field strength is

A) None of these

B) N.ø/I

C) N.i / L

D) N.i

3 / 20

Category: Magnetic Circuit

3. Strength of the electromagnet can be increased by increasing –

A) either b or c

B) Magnitude of current

C) Reluctance

D) number of turns in the circuit

4 / 20

Category: Magnetic Circuit

4. Magnetic field has -

A) both magnitude & direction

B) Only direction

C) none

D) only magnitude

5 / 20

Category: Magnetic Circuit

5. A coil of many circular turns of wire wrapped in the shape of a cylinder is known as -

A) Solenoid

B) Insulator

C) Multi turn coil

D) both a and c

6 / 20

Category: Magnetic Circuit

6. Magnetic lines of forces –

A) never intersect

B) are not predictable

C) intersect only in some special circumstances

D) often intersect

7 / 20

Category: Magnetic Circuit

7. The reciprocal of permeability is –

A) Resistivity

B) reluctivity

C) MMF

D) Conductivity

8 / 20

Category: Magnetic Circuit

8. In a electric circuit MMF is similar to

A) Electromotive force

B) Flux

C) Resistance

D) Current

9 / 20

Category: Magnetic Circuit

9. The unit of magnetic flux is –

A) Ampere turns

B) Tesla

C) Henry

D) Weber

10 / 20

Category: Magnetic Circuit

10. Magnetic circuit is a closed path followed by –

A) M.M.F

B) None of these

C) flux

D) Flux density

11 / 20

Category: Magnetic Circuit

11. Electric field & magnetic field are interrelated and are known as –

A) Electromagnetism field

B) Electromagnetic fields

C) Electric magnets

D) Electromagnets

12 / 20

Category: Magnetic Circuit

12. Unit of magnetic flux density is in S.I.

A) Tesla

B) WB/m²

C) Oersted

D) Both A & B

13 / 20

Category: Magnetic Circuit

13. Magnetic field is proportional to the –

A) all of these

B) direction of electric charges

C) Quality of electric charges

D) Speed of electric charges

14 / 20

Category: Magnetic Circuit

14. Paramagnetic materials are –

A) none

B) strongly repelled by a magnet

C) Strongly attracted by a magnet

D) slightly attracted by a magnet

15 / 20

Category: Magnetic Circuit

15. M.M.F in a magnetic circuit is corresponding to ……… in an electric circuit-

A) None

B) Voltage drop

C) Emf

D) Current

16 / 20

Category: Magnetic Circuit

16. S.I unit of Reluctance-

A) AT/m

B) AT/Wb

C) N/Wb

D) AT

17 / 20

Category: Magnetic Circuit

17. Hysteresis loss least depends on –

A) ambient temperature

B) steinmetz coefficient of material

C) frequency

D) volume of material

18 / 20

Category: Magnetic Circuit

18. In a magnetic material hysteresis loss takes place primarily due to –

A) rapid reversals of its magnetisation

B) flux density lagging behind magnetising force

C) molecular friction

D) its high retentivity

19 / 20

Category: AC Fundamental

19. Absolute permittivity of dielectric medium is represented as –

A) ε0 εr

B) ε0

C) εr /ε0

D) εr

20 / 20

Category: Basic Electricity

20. To obtain a high value of capacitance, the permittivity of dielectric medium should be –

A) unity

B) high

C) zero

D) Low

Your score is

The average score is 47%

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Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-2.3 : Electromagnetic induction: Faraday’s laws , Lenz’s law

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 4

Category: Magnetic Circuit

1. An open coil has –

A) Infinite resistance and normal inductance

B) Zero resistance and high inductance

C) Infinite resistance and zero inductance

D) Zero resistance and inductance

2 / 4

Category: Magnetic Circuit

2. If current in a conductor increases then according to Lenz's law self-induced voltage will –

A) Aid the applied voltage

B) Produce current opposite to the increasing current

C) Tend to decrease the amount of current

D) Aid the increasing current

3 / 4

Category: Magnetic Circuit

3. The induced E.M.F. and current always oppose the cause of producing them is according to which law?

A) Coulomb

B) Newton

C) Lenz

D) Faraday

4 / 4

Category: Magnetic Circuit

4. The principle of electromagnetic induction was propounded by

A) Faraday

B) Edison

C) Flemmings

D) Orsted

Your score is

The average score is 60%

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Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-2.4 : Dynamically induced emf; Statically induced emf; Principle of self and mutual inductance

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 6

Category: AC Machines & Transformer

1. In which device is the principle of statically induced E.M.F used?

A) Generator

B) Transformer

C) Battery

D) Motor

2 / 6

Category: Basic Electricity

2. Electrolysis is possible with –

A) D.C supply only

B) none

C) both A.C and D.C supply

D) A.C supply only

3 / 6

Category: Magnetic Circuit

3. Statically induced E.M.F’s magnitude depends on the –

A) Coil resistance

B) Flux magnitude

C) None

D) Rate of change of flux

4 / 6

Category: Magnetic Circuit

4. Which is the property of a coil by which a counter E.M.F is induced when the current through the coil changes?

A) Self-inductance

B) Mutual inductance

C) Capacitance

D) None

5 / 6

Category: AC Fundamental

5. Sparking may occurs when a load is switched off due to the presence of –

A) High capacitance

B) Low impedance

C) High impedance

D) High Inductance

6 / 6

Category: DC Machines

6. Principle of dynamically induced E.M.F is used in a –

A) Generator

B) Choke

C) Transformer

D) Thermo-couple

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/12

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Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-2.5 : Energy stored in magnetic circuit

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 12

Category: AC Fundamental

1. In a capacitor, the electrical energy is stored in –

A) both a and b

B) electric field

C) Magnetic field

D) none

2 / 12

Category: AC Fundamental

2. The energy stored by a capacitor is given by –

A) Q^2 / 2C

B) All of the above

C) 1/2 QV

D) 1/2 CV^2

3 / 12

Category: Magnetic Circuit

3. In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will –

A) Remain the same

B) decrease

C) Increase

D) initially increase and then decrease

4 / 12

Category: Magnetic Circuit

4. Higher the self-inductance of a coil –

A) lower the E.M.F. induced

B) Greater the flux produced by it

C) longer the delay in establishing steady current through it

D) Lesser its Weber-turns

5 / 12

Category: Magnetic Circuit

5. If both the number of turns and the core length of an inductive coil are doubled, then its self-inductance will be –

A) Unaffected

B) halved

C) doubled

D) quadrupled

6 / 12

Category: Magnetic Circuit

6. Energy stored in a magnetic field is given by –

A) L^2 I / 2

B) LI^2

C) LI^2 / 2

D) IL^2

7 / 12

Category: Magnetic Circuit

7. If the current in a coil having a constant inductance of L henrys grows at a uniform rate, what is the value of the average current?

A) I/4

B) 0

C) I/2

D) I

Note: The average current is the average of the current which flows in the inductor. Hence it is I/2.

8 / 12

Category: Magnetic Circuit

8. Calculate the emf induced in an inductor if the inductance is 10H and the current is 2 A in 4 s.

A) 2.5 V

B) 1.5 V

C) 3.5 V

D) 5 V

Hints: The expression for emf in an inductive circuit is: e = L = (10 × 2) /4 v = 5V.

9 / 12

Category: Magnetic Circuit

9. What is the power in the magnetic field if the current in a coil has a constant inductance of L henrys grows at a uniform rate?

A) LI / 2t

B) L / 2It

C) L / 2I^2 t

D) LI^2/ 2t

Note: EMF induced in the coil is L. Energy = × = L × = Li²/2. Power = Energy/Time = Li²/2t.

10 / 12

Category: Magnetic Circuit

10. Calculate the value of stored energy in an inductor if the value of inductance is 20 H and 4 A of current flows through it.

A) 220 J

B) 190 J

C) 150 J

D) 160 J

Hints:

The expression for energy in an inductor is E = LI²/2 = (20 × 4 × 4) /2 J = 160 J.

11 / 12

Category: Magnetic Circuit

11. If the current in a coil having a constant inductance of L henrys grows at a uniform rate, what is the value of the average current?

A) I/4

B) 0

C) I

D) I/2

12 / 12

Category: Magnetic Circuit

12. Calculate the value of energy stored in an inductor if the value of inductance is 10H and 2 A of current flows through it. –

A) 20 J

B) 15 J

C) 60 J

D) 90 J

Hints: Energy Stored = 0.5 L I² = 0.5×10×2² = 20 J

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The average score is 52%

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Electrical Notebook

2nd Semester

FEEE Unit-2.6 : Flemming’s Left Hand Rule and Right Hand Rule

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 5

Category: Magnetic Circuit

1. A magnetic field like this is called –

A) A uniform field

B) a distorted field

C) a paramagnetic field

D) A parallel field

2 / 5

Category: Magnetic Circuit

2. Which rule do we use to predict the direction of movement of a current carrying wire in a magnetic field?

A) Faraday's Left Hand Rule

B) Fleming's Right Hand Rule

C) Fleming's Left Hand Rule

D) Faraday's Right Hand Rule

3 / 5

Category: Magnetic Circuit

3. When a permanent magnet is cut half what will be the result?

A) The piece of metal will lose it magnetism

B) Two single pole magnets, each of the magnets only having north poles

C) Two dipole magnets, each with a north and South Pole

D) Two single pole magnets, one with a north pole and one with a south pole

4 / 5

Category: DC Machines

4. The direction of rotation of a dc motor is found out by

A) Pulm rule

B) Flemmings Right hand rule

C) Left hand thumb rule

D) Flemmings Left hand rule

5 / 5

Category: DC Machines

5. The direction of rotation of a dc generator is found out by

A) Flemmings Left hand rule

B) Flemmings Right hand rule

C) Palm rule

D) Left hand thumb rule

Your score is

The average score is 42%

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2nd Semester

FEEE Unit-2.7 : Simple problems on Electric & Magnetic Circuit

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 2

Category: Basic Electricity

1. If energy required to heat up a heater coil is 4 KWh and the energy loss is 20%, then what is the energy input?

A) 4 kWh

B) 2 kWh

C) 1 kWh

D) 5 kWh

Hints:

Input= 4 kWh+20% = 5 kWh

2 / 2

Category: Basic Electricity

2. A bulb consumes 100 W when supply voltage is 200 V. Then find the energy consumed in 30 minutes.

A) 5 kWh

B) 0.05 kWh

C) 0.05 Wh

D) 0.005 kWh

Hints:

Energy consumed = Power x time = 100 x 0.5 = 50 Wh = 0.05 kWh

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The average score is 30%

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Unit- 3 : AC Circuits

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Electrical Notebook

2nd Semester

FEEE Unit- 3.1 : Concept of Angular speed, Cycle, Frequency, Periodic time, Amplitude, RMS value, Average value, Form Factor, Peak Factor, impedance, phase and phase difference.

Fundamental of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branches

1 / 20

Category: AC Fundamental

1. Form factor of square wave is-

A) 1.47

B) 1

C) 1.41

D) 2

2 / 20

Category: AC Fundamental

2. An alternating voltage is given by, V = 10 sin 2πt. The frequency of the AC signal is –

A) 1 Hz

B) 2π Hz

C) π Hz

D) None

Hints:

v= Vm sin 2πft volt

here f=1 Hz

3 / 20

Category: AC Fundamental

3. The peak value of a sine wave is 200 V. Its average value is –

A) 127.4 V

B) 141.4 V

C) 282.8 V

D) 200 V

Hints:

Peak factor = Max value/rms value = 1.41

rms value = 200/1.41 = 141.8 V

Form factor = rms value / avarage value = 1.11

Avarage value = 141.84/1.11 = 127.7 V

4 / 20

Category: AC Fundamental

4. For a sinusoidal AC voltage, amplitude factor is –

A) 1.414

B) 0.637

C) 0.707

D) 1.11

Hints:

The amplitude factor and peak factor is same. And the value of it for sinusouidal waveform is 1.4142

5 / 20

Category: AC Fundamental

5. The square waveform of current has following relation between R.M.S. value and average value –

A) None

B) R.M.S. value is equal to average value

C) R.M.S. value of current is less than average value

D) R.M.S. value of current is greater than average value

6 / 20

Category: AC Fundamental

6. Capacitive Susceptance is a measure of –

A) A purely capacitive circuit's ability to resist the flow of current

B) The extent of neutralization of reactive power in a circuit

C) Reactive power in a circuit

D) A purely capacitive circuit's ability to pass current

7 / 20

Category: AC Fundamental

7. The frequency of an alternating current is –

A) the number of electrons passing through a point in one second

B) The speed with which the alternator runs

C) The number of cycles generated in one minute

D) The number of waves passing through a point in one second

8 / 20

Category: AC Fundamental

8. A current is set to be alternating when it changes –

A) Magnitude only

B) Both magnitude and direction

C) Direction only

D) None

9 / 20

Category: AC Fundamental

9. Form factor of half wave rectified ac is-

A) 1.41

B) 1.11

C) 1.57

D) 2

10 / 20

Category: AC Fundamental

10. An Alternating Current has a periodic time of 0.02 sec, then the frequency will be –

A) 30 Hz

B) 5 Hz

C) 20 Hz

D) 50 Hz

11 / 20

Category: AC Fundamental

11. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is –

A) Not a sinusoid

B) A sinusoid of double the frequency

C) A sinusoid of the same frequency

D) A sinusoid of half the original frequency

12 / 20

Category: AC Fundamental

12. Real part and imaginary part of admittance are respectively –

A) Reluctance and Permeance

B) Conductance, Susceptance

C) Resistance and Reactance

D) Permeance and Susceptance

13 / 20

Category: AC Fundamental

13. Average value can be defined based on which of the following? –

A) Charge transfer

B) Current

C) Voltage

D) Heating effect

14 / 20

Category: AC Fundamental

14. RMS value can be defined based on which of the following? –

A) Voltage

B) Charge transfers

C) Heating effect

D) Current

15 / 20

Category: AC Fundamental

15. The RMS value of a sine wave is 100 A. Its peak value is –

A) 141 A

B) 282.8 A

C) 150 A

D) 70.7 A

Hints: Peak factor of sine wave = 1.41

Peak value = Peak factor x rms value = 1.41 x 100 = 141 A

16 / 20

Category: AC Fundamental

16. Two waves of the same frequency have opposite phase when the phase angle between them is –

A) 360°

B) 0°

C) 90°

D) 180°

17 / 20

Category: AC Fundamental

17. A heater is rated as 230 V, 10 kW. The value 230 V refers to –

A) None

B) RMS voltage

C) Average voltage

D) Peak voltage

18 / 20

Category: AC Fundamental

18. From heating point of view I_D.C. is equal to –

A) None

B) I max Lm value

C) I R.M.S.

D) I average value

19 / 20

Category: AC Fundamental

19. A sine wave has a frequency of 50 Hz. Its angular frequency is _______radian/second.

A) 50 π

B) 25 π

C) 5 π

D) 100 π

Hints:

Angular frequency = 2πf rad/sec = 100π

20 / 20

Category: AC Fundamental

20. RMS value can be defined based on which of the following? –

A) Heating effect

B) Current

C) Voltage

D) Charge transfer

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The average score is 35%

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Electrical Notebook

2nd Semester

FEEE Unit-3.2 : Representation of sinusoidal quantities in (i) exponential form (ii) complex form and (iii) polar form

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 4

Category: Basic Electricity

1. What is the RMS value of the current if the maximum value of sine wave current is 100 A?

A) 70.72 A

B) 7.07 A

C) 707.2 A

D) 100 A

Hints:

from peak factor,

rms value = maximum value/1.41 = 100/1.41= 70.72 A

2 / 4

Category: AC Fundamental

2. The equation for instantaneous value of alternating current is, then time period will be –

A) 0.01 sec

B) 0.06 sec

C) 0.04 sec

D) 0.05 sec

Hints:

2πf= 628

f=628/2π = 99.94 Hz

t= 1/f = 0.01 sec

3 / 4

Category: AC Fundamental

3. The frequency of an AC voltage in India, is–

A) 100 Hz

B) 50 Hz

C) 314 Hz

D) 75 Hz

4 / 4

Category: AC Fundamental

4. The frequency of an AC voltage,e= 100 cos 314t , will be –

A) 50 Hz

B) None

C) 25 Hz

D) 60 Hz

Hints:

2πf = 314

f= 314/2π = 49.97 Hz = 50 Hz

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The average score is 43%

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2nd Semester

FEEE Unit-3.3 : Expressions of voltage and current through pure resistance, inductance and capacitance with sinusoidal excitation and phasor representation

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 5

Category: AC Fundamental

1. In a series R-C circuit, the applied voltage –

A) 90° leads the current

B) leads the current

C) 90° lags the current

D) lags the current

2 / 5

Category: AC Fundamental

2. In series R-L circuit power factor can be defined as –

A) All of these

B) R/Z

C) P/S

D) Vr/V

3 / 5

Category: AC Fundamental

3. In an AC circuit (Sine wave) with R and L in series –

A) Voltage across R and L 180o out of face

B) The voltage across R leads the voltage across L by 90°

C) The voltage across R lags the voltage across L by 90°

D) Voltage across R and L are in phase

4 / 5

Category: AC Fundamental

4. In a R-L-C circuit, power loss takes place is –

A) R only

B) L only

C) C only

D) R-L-C all

5 / 5

Category: Basic Electricity

5. For a sinusoidal AC voltage, amplitude factor is –

A) 1.414

B) 0.637

C) 1.11

D) 0.707

Hints:

Amplitude factor is another name of peak factor or crest factor which is 1.41 for sinusoidal ac voltage.

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The average score is 31%

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2nd Semester

FEEE Unit-3.4 : Study of simple R-L, R-C, R-L-C series and parallel circuits with sinusoidal excitation and phasor representation

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 5

Category: AC Fundamental

1. In a series R-C circuit, the applied voltage –

A) lags the current

B) 90° lags the current

C) 90° leads the current

D) leads the current

2 / 5

Category: AC Fundamental

2. In series R-L circuit power factor can be defined as –

A) Vr /V

B) R/Z

C) P/S

D) All of the above

3 / 5

Category: AC Fundamental

3. For a sinusoidal AC voltage, amplitude factor is –

A) 0.637

B) 0.707

C) 1.11

D) 1.414

Amplitude factor or peak factor or crest factor is the ratio between maximum value of the ac quantity to the rms value of the same.

4 / 5

Category: AC Fundamental

4. In an AC circuit (Sine wave) with R and L in series –

A) The voltage across R lags the voltage across L by 90°

B) Voltage across R and L 180o out of face

C) The voltage across R leads the voltage across L by 90°

D) Voltage across R and L are in phase

In an inductive circuit current always lag behind the voltage.

5 / 5

Category: AC Fundamental

5. In a R-L-C circuit, power loss takes place is –

A) R only

B) C only

C) L only

D) R-L-C all

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The average score is 49%

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Electrical Notebook

2nd Semester

FEEE Unit-3.5 : Concept of impedance, impedance triangle, power factor, active, reactive and apparent power, power triangle

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 20

Category: Basic Electricity

1. When an alternating current passes through an Ohmic resistance the electrical power converted into heat is –

A) Apparent power

B) none of the above

C) True power

D) Reactive power

2 / 20

Category: AC Fundamental

2. The power factor of an AC circuit lies between –

A) -1 and 1

B) 0 and 1

C) 0 and -1

D) None of these

3 / 20

Category: AC Fundamental

3. Unit of impedance is

A) Ohm

B) Mho

C) Henry

D) Farad

4 / 20

Category: AC Fundamental

4. Capacitors for power factor correction are rated in -

A) KW

B) VA

C) KVAR

D) KVA

5 / 20

Category: AC Fundamental

5. The alternative name/names for active power is/are –

A) True power

B) all of the above

C) Real power

D) Average power

6 / 20

Category: AC Fundamental

6. In series R-L circuit power factor can be defined as -

A) Vr/V

B) R/Z

C) Active Power (P)/Apparent Power (S)

D) All of the above

7 / 20

Category: AC Fundamental

7. A pure capacitance connected across 50 Hz, 230 V supply consumes 0.04 W. This consumption is attributed to –

A) Ohmic loss due to Ohmic resistance of plates

B) both A and B

C) Loss of energy in dielectric

D) Capacitive reactance in ohms

8 / 20

Category: AC Fundamental

8. Reactive power is the product of

A) V, I

B) V, I, tan ø

C) V, I, cos ø

D) V, I, sin ø

9 / 20

Category: AC Fundamental

9. The power factor of practical inductor is

A) Unity

B) Zero

C) Lagging

D) Leading

10 / 20

Category: AC Fundamental

10. In an AC circuit a low value of KVAR compared with KW indicates –

A) High power factor

B) Maximum load current

C) Low efficiency

D) Unity power factor

Power factor=KW/KVA. High value of KW means higher power factor.

11 / 20

Category: AC Fundamental

11. From the following when capacitive reactance will be more?

A) Capacitance is more & supply frequency is less

B) capacitance & supply frequency is more

C) Capacitance & supply frequency is less

D) capacitance is less & supply frequency is more

Xc= 1/2πfC

12 / 20

Category: AC Fundamental

12. An electric incandescent lamp has the power factor of –

A) unity

B) leading

C) Lagging

D) zero

13 / 20

Category: Circuit Theory & Network

13. For a pure inductive circuit, the average demand of power from the source will be –

A) Maximum

B) Minimum

C) Zero

D) a very small amount

14 / 20

Category: Circuit Theory & Network

14. In any AC circuit always –

A) Reactive power is more than apparent power

B) Reactive power is more than actual power

C) Apparent power is more than actual power

D) Actual power is more than reactive power

15 / 20

Category: Circuit Theory & Network

15. In a R-L-C series circuit, if the capacitive reactance is greater than the inductive reactance, then the power factor will be –

A) Leading

B) Zero

C) Unity

D) Lagging

16 / 20

Category: Circuit Theory & Network

16. In a R-L-C series circuit, if the inductive reactance is greater than the capacitive reactance, then the power factor will be –

A) Lagging

B) Zero

C) Leading

D) Unity

17 / 20

Category: Circuit Theory & Network

17. Which of the following will not be affected due to change in R?

A) Q

B) Resonant frequency

C) Bandwidth

D) None

Resonent frequency = 1/2π √(L/C)

18 / 20

Category: Circuit Theory & Network

18. A parallel AC circuit in resonance will –

A) Have a high impedance

B) Act like a resister of low value

C) Have a high voltage developed across each inductive and capacitive section

D) Have current in each section equal to the line current

19 / 20

Category: Circuit Theory & Network

19. What will be the Q-factor of a circuit, if power factor is 0.9?

A) 1

B) 0.81

C) 1.111

D) 0.111

Q factor is the reciprocal of the power factor

20 / 20

Category: Circuit Theory & Network

20. The component of current which is in quadrature with supply voltage, is –

A) True component of current

B) Active component of current

C) none

D) Watt-less component of current

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The average score is 36%

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2nd Semester

FEEE Unit-3.6 : Voltage and Current relationship in Star and Delta connections

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 2

Category: AC Machines & Transformer

1. With the star delta starter the voltage across the motor winding at starting is –

A) 100%

B) 75%

C) 57.7%

D) 66.7%

2 / 2

Category: Basic Electricity

2. Three nos 6-ohm resistances are connected in delta. Value of resistances if connected in star –

A) 9 ohm

B) 6 ohm

C) 18 ohm

D) 2 ohm

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The average score is 38%

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Unit- 4 : Transformers and Machines

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2nd Semester

FEEE Unit- 4.1 : Transformer and Machines

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common for all branches

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FEEE Unit-4.2 : General construction and principle of different type of transformers

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

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2nd Semester

FEEE Unit-4.3 : EMF equation and transformation ratio of transformers

Fundamentals of Electrical & Electronics Engineering

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2nd Semester

FEEE Unit-4.4 : Auto-transformers

Fundamentals of Electrical & Electronics Engineering

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2nd Semester

FEEE Unit-4.5 : Construction and working principle of motors

Fundamentals of Electrical & Electronics Engineering

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FEEE Unit-4.6 : Types of motors and applications

Fundamentals of Electrical & Electronics Engineering

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FEEE Unit-4.7 : Simple problems on transformers and electrical machines

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

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MCQs on Fundamental of Electrical & Electronics Engineering / 2nd Sem

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