MCQ Quiz on Fundamental of Electrical & Electronics Engineering

Watch Experimental Videos on FEEE Lab : Click here

Unit- 1 : Electric and Magnetic Circuits

/20

1 votes, 5 avg

114

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

A) a resistor

B) a normal capacitor as in AC

C) a short circuit

D) open circuit

2 / 20

Category: Basic Electricity

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

A) Insulators

B) Dielectrics

C) Conductors

D) Semi-conductors

3 / 20

Category: Basic Electricity

3. What is the relation between resistance R and resistivity ρ of a wire ?

A) R= ρ. (a/l)

B) R= a/( ρ.l)

C) R= l/( ρ.a)

D) R=ρ. (l/a)

4 / 20

Category: Basic Electricity

4. 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

5 / 20

Category: Basic Electricity

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

A) Faraday, Henry

B) Henry, Coulomb

C) Coulomb, Faraday

D) Henry, Faraday

6 / 20

Category: Basic Electricity

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

A) Resistivity depend on area of cross section

B) Resistivity depend on the length

C) Resistance does not depend on the temperature

D) Resistance depends on the temperature

7 / 20

Category: Basic Electricity

7. A choke coil is a coil having-

A) Low inductance high resistance

B) High inductance high capacitance

C) Low resistance high capacitance

D) High inductance negligible resistance

8 / 20

Category: Basic Electricity

8. Frequency of Direct Current is

A) 50 kHz

B) 0 Hz

C) 40 Hz

D) 50 Hz

9 / 20

Category: Basic Electricity

9. Unit of resistivity is

A) Ohm

B) Ohm-m

C) Ohm-m²

D) Ohm/m

10 / 20

Category: Basic Electricity

10. An Inductor works as a ___________ circuit for DC supply.

A) Non-polar

B) Open

C) Short

D) Polar

11 / 20

Category: Basic Electricity

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

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

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

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

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

12 / 20

Category: Basic Electricity

12. If the voltage across a capacitor is constant, then current passing through it is ________

A) 0

B) Infinity

C) 1

D) -1

Hints: I= c.(dv/dt)

13 / 20

Category: Basic Electricity

13. Resistance of any circuit depends on –

A) Directly proportionate with length and cross sectional area

B) Inversely proportionate with length and cross sectional area

C) Inversely proportionate with length and directly proportionate with cross sectional area

D) Directly proportionate with length and inversely proportionate with cross sectional area

14 / 20

Category: Basic Electricity

14. 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 value of resistance cannot be determined from the given data

B) The 2m wire has higher resistance

C) The 5m wire has higher resistance

D) Both have equal resistance

15 / 20

Category: Basic Electricity

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

A) Brown Black Golden Golden

B) Black Brown Black Silver

C) Black Brown Black Golden

D) Brown Black Golden Silver

16 / 20

Category: Basic Electricity

16. In a pure inductive circuit current is

A) Leads by voltage by 90°

B) Lags behind Voltage by 90°

C) Lags by voltage by 0°

D) Leads by voltage by 0°

17 / 20

Category: Basic Electricity

17. If the length of a wire is doubled and diameter is halved, then the resistance will become _________ of the previous.

A) 16 times

B) 8 times

C) 32 times

D) 4 times

18 / 20

Category: Basic Electricity

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

A) The other two lamps will glow

B) Total current in the circuit will increase

C) All the three will glow

D) No bulb will glow

19 / 20

Category: Basic Electricity

19. A wire having an area of cross section = 10sqm and another wire having an area of cross section= 15sqm, have the same length and are made up of the same material. Which wire has more resistance?

A) The 10 sqm wire has higher resistance

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

C) The 15 sqm wire has higher resistance

D) Both have equal resistance

20 / 20

Category: Basic Electricity

20. The Inductor doesn’t allow sudden changes in

A) Current

B) Inductance

C) Resistance

D) Voltage

Your score is

The average score is 41%

LinkedIn Facebook Twitter VKontakte

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

A) 50 Hz

B) 1,000 Hz

C) 100 Hz

D) 10 Hz

Hints:

Frequency = 1/time period

2 / 20

Category: Basic Electricity

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

A) False

B) True

3 / 20

Category: Basic Electricity

3. A phasor represents

A) The width of a quantity

B) The magnitude and a quantity direction

C) The magnitude of a quantity

D) The phase angle

4 / 20

Category: Basic Electricity

4. The unit of frequency is the hertz

A) True

B) False

5 / 20

Category: Basic Electricity

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

A) 15 mA

B) 1 mA

C) 1.5 mA

D) 10 mA

6 / 20

Category: Basic Electricity

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

A) 4 V

B) 26.6 V

C) 18.8 V

D) 2.66 V

7 / 20

Category: Basic Electricity

7. The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.

A) False

B) True

8 / 20

Category: Basic Electricity

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

A) 4 μs

B) 2 μs

C) 20 μs

D) 100 μs

9 / 20

Category: Basic Electricity

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

A) 16 mA

B) 22.6 mA

C) 45.12 mA

D) 39.6 mA

10 / 20

Category: Basic Electricity

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

A) False

B) True

11 / 20

Category: Basic Electricity

11. A 1 kHz signal has a period of 1 ms

A) False

B) True

12 / 20

Category: Basic Electricity

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

A) 25%

B) 100%

C) 50%

D) 1%

13 / 20

Category: Basic Electricity

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

A) 50.96 V

B) 25.48 V

C) 14.14 V

D) 6.37 V

14 / 20

Category: Basic Electricity

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

A) False

B) True

15 / 20

Category: Basic Electricity

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

A) 1,200 cycles

B) 120 cycles

C) 12 cycles

D) 1/100 cycle

16 / 20

Category: Basic Electricity

16. 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) 40°

B) 0°

C) None of the above

D) 45°

17 / 20

Category: Basic Electricity

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

A) True

B) False

18 / 20

Category: Basic Electricity

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

A) 25,000 Hz

B) 2,500 Hz

C) 400 Hz

D) 250 Hz

19 / 20

Category: Basic Electricity

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

A) 26 V

B) 13 V

C) 6.5 V

D) None of the above

20 / 20

Category: AC Fundamental

20. The length of a phasor represents the amplitude

A) True

B) False

Your score is

The average score is 40%

LinkedIn Facebook Twitter VKontakte

/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. Ideal voltage source has-

A) High internal resistance

B) Zero internal resistance

C) Infinity internal resistance

D) Low internal resistance

2 / 16

Category: Basic Electricity

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

A) The same for all resistors

B) Is divided proportionally across all resistors

C) Is divided equally among all resistors

D) Is zero for all resistors

3 / 16

Category: Basic Electricity

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

A) The other bulb blows out as well

B) The other bulb glows with increased brightness

C) The other bulb stops glowing

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

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) Zero

B) The value of the source voltage

C) Infinite

D) Null

6 / 16

Category: Basic Electricity

6. The energy per unit charge is

A) Work

B) Voltage

C) Current

D) Power

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

7 / 16

Category: Basic Electricity

7. Active circuit have -

A) none of these

B) one voltage source

C) one current source

D) either a or b

8 / 16

Category: Basic Electricity

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

A) Voltage

B) Neither voltage nor current

C) Current

D) Both voltage and current

9 / 16

Category: Basic Electricity

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

A) It becomes half its original value

B) It becomes infinity

C) It becomes double its original value

D) It becomes zero

10 / 16

Category: Basic Electricity

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

A) The other bulb stops glowing

B) The other bulb also burns out

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

D) The other bulb glows with increased brightness

11 / 16

Category: Basic Electricity

11. Batteries are generally connected in______

A) Parallel

B) Either series or parallel

C) Series

D) Neither series nor parallel

12 / 16

Category: Basic Electricity

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

A) Parallel

B) Series

C) Neither series nor parallel

D) Either series or parallel

13 / 16

Category: Basic Electricity

13. Many resistors connected in series will?

A) Divide the voltage proportionally among all the resistor

B) Reduce the power to zero

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

D) Divide the current proportionally

14 / 16

Category: Basic Electricity

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

A) Proportional to the power in the circuit

B) The amount of time the circuit

C) Equal in all branches

D) Proportional to the value of the resistors

15 / 16

Category: Basic Electricity

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

A) Series

B) Parallel

C) Either series or parallel

D) Neither series nor parallel

16 / 16

Category: Basic Electricity

16. Which is the most cost efficient connection?

A) Parallel

B) Series

C) Neither series nor parallel

D) Either series or parallel

Your score is

The average score is 47%

LinkedIn Facebook Twitter VKontakte

/16

0 votes, 0 avg

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

A) 75 ohm

B) 55 ohm

C) 15 ohm

D) 25 ohm

2 / 16

Category: Basic Electricity

2. 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) Insufficient data provide

C) The largest one among the three values

D) 0 A

Hints:

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

3 / 16

Category: Basic Electricity

3. Calculate the current across the 20 ohm resistor

A) 36.67 A

B) 6.67 A

C) 10 A

D) 20 A

4 / 16

Category: Basic Electricity

4. The total resistance between A and B are?

A) 5 ohm

B) 0 ohm

C) 20 ohm

D) 80 ohm

5 / 16

Category: Basic Electricity

5. The voltage across the short is?

A) 11.25 V

B) Zero

C) Infinity

D) 135 V

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.

6 / 16

Category: Basic Electricity

6. Find the voltage across the 6 ohm resistor

A) 181.6 V

B) 54.48 V

C) 27.27 V

D) 150 V

7 / 16

Category: Basic Electricity

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

A) 27 ohm

B) 135 ohm

C) 12 ohm

D) 5 ohm

Hints:

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

8 / 16

Category: Basic Electricity

8. Calculate the equivalent resistance between A and B

A) 2 ohm

B) 4 ohm

C) 8 ohm

D) 6 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.

9 / 16

Category: Basic Electricity

9. The voltage across the open circuit is?

A) 0 V

B) 90 V

C) 100 V

D) Infinity

10 / 16

Category: Basic Electricity

10. Calculate the resistance between A and B

A) 7 ohm

B) 29.69 ohm

C) 14.26 ohm

D) 3.56 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.

11 / 16

Category: Basic Electricity

11. Calculate the equivalent resistance between A and B

A) 60 ohm

B) 12 ohm

C) 48 ohm

D) 15 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.

12 / 16

Category: Basic Electricity

12. Find the current in the circuit.

A) 1 A

B) 3 A

C) 2 A

D) 4 A

13 / 16

Category: Basic Electricity

13. Calculate the total current in the circuit

A) 11.43 A

B) 15 A

C) 10 A

D) 20 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.

14 / 16

Category: Basic Electricity

14. Voltage across the 60 ohm resistor is______

A) 120 V

B) 48 V

C) 0 V

D) 72 V

15 / 16

Category: Basic Electricity

15. Calculate the equivalent resistance between A and B

A) 10.67 ohm

B) 46.67 ohm

C) 26.67 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. Calculate the total resistance between the points A and B.

A) 0 ohm

B) 0.48 ohm

C) 7.67 ohm

D) 7 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.

Your score is

The average score is 39%

LinkedIn Facebook Twitter VKontakte

Unit- 2 : Electric and Magnetic Circuits

0 votes, 0 avg

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) Magnetomotive force

C) Electromotive force

D) voltage

2 / 13

Category: Basic Electricity

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

A) no bulb will glow

B) Total current in the circuit will increase

C) all the three will glow

D) The other two lamps will glow

3 / 13

Category: Basic Electricity

3. S.I unit of Power is –

A) Watt-hr

B) Coulomb

C) Watt

D) Joule

4 / 13

Category: Basic Electricity

4. Insulating material can –

A) Protect a short circuit between two conductors

B) Conduct very large current

C) Store varying voltage

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

5 / 13

Category: Basic Electricity

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

A) Multimeter

B) Ammeter

C) Ohmmeter

D) Voltmeter

6 / 13

Category: Basic Electricity

6. Electric pressure is also called –

A) Conductance

B) Voltage

C) Resistance

D) Energy

7 / 13

Category: Basic Electricity

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

A) electrons

B) positive charges

C) Atoms

D) electrons & ions

8 / 13

Category: Basic Electricity

8. S.I unit of conductance is –

A) Mho-m

B) Ohm

C) Ohm-m

D) Mho

9 / 13

Category: Basic Electricity

9. KWh is the unit of -

A) Power

B) Energy

C) Work

D) Efficiency

10 / 13

Category: Basic Electricity

10. Instantaneous power in inductor is proportional to the –

A) Temperature of the inductor

B) Square of rate of change of current

C) Square of instantaneous current

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

11 / 13

Category: Basic Electricity

11. 1 coulomb charge equals the charge of –

A) 6.24×10^18 electrons

B) 6.24×10^12 electrons

C) 6.24×10^-18 electrons

D) 6.24×10^16 electrons

12 / 13

Category: Basic Electricity

12. In case of D.C –

A) Direction of current changes with time

B) Magnitude and direction both change with time

C) Magnitude of current changes with time

D) Magnitude and direction remains constant

13 / 13

Category: AC Fundamental

13. Average power taken by a pure capacitor is –

A) Zero

B) Unity

C) Minimum

D) Maximum

Your score is

The average score is 67%

Facebook Twitter

/20

0 votes, 0 avg

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: Basic Electricity

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

A) unity

B) high

C) zero

D) Low

2 / 20

Category: Magnetic Circuit

2. Hysteresis loss least depends on –

A) volume of material

B) ambient temperature

C) frequency

D) steinmetz coefficient of material

3 / 20

Category: Magnetic Circuit

3. Magnetic field is proportional to the –

A) all of these

B) Speed of electric charges

C) Quality of electric charges

D) direction of electric charges

4 / 20

Category: Magnetic Circuit

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

A) Electromagnetism field

B) Electromagnets

C) Electromagnetic fields

D) Electric magnets

5 / 20

Category: Magnetic Circuit

5. In a electric circuit MMF is similar to

A) Flux

B) Electromotive force

C) Current

D) Resistance

6 / 20

Category: Magnetic Circuit

6. Magnetic field has -

A) none

B) both magnitude & direction

C) only magnitude

D) Only direction

7 / 20

Category: Magnetic Circuit

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

A) Emf

B) None

C) Current

D) Voltage drop

8 / 20

Category: Magnetic Circuit

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

A) its high retentivity

B) flux density lagging behind magnetising force

C) molecular friction

D) rapid reversals of its magnetisation

9 / 20

Category: Magnetic Circuit

9. Magnetic field strength is

A) N.i / L

B) N.ø/I

C) N.i

D) None of these

10 / 20

Category: Magnetic Circuit

10. The reciprocal of permeability is –

A) Resistivity

B) MMF

C) reluctivity

D) Conductivity

11 / 20

Category: Magnetic Circuit

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

A) both a and c

B) Insulator

C) Multi turn coil

D) Solenoid

12 / 20

Category: Magnetic Circuit

12. S.I unit of Reluctance-

A) N/Wb

B) AT/Wb

C) AT/m

D) AT

13 / 20

Category: Magnetic Circuit

13. Paramagnetic materials are –

A) slightly attracted by a magnet

B) Strongly attracted by a magnet

C) none

D) strongly repelled by a magnet

14 / 20

Category: Magnetic Circuit

14. 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

15 / 20

Category: Magnetic Circuit

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

A) Both A & B

B) Tesla

C) WB/m²

D) Oersted

16 / 20

Category: Magnetic Circuit

16. Magnetic lines of forces –

A) are not predictable

B) never intersect

C) intersect only in some special circumstances

D) often intersect

17 / 20

Category: Magnetic Circuit

17. Magnetic circuit is a closed path followed by –

A) Flux density

B) flux

C) None of these

D) M.M.F

18 / 20

Category: Magnetic Circuit

18. Which of the following is unit less?

A) Magnetic susceptibility

B) Permeability

C) Permittivity

D) Moment of Magnet

19 / 20

Category: Magnetic Circuit

19. The unit of magnetic flux is –

A) Tesla

B) Weber

C) Henry

D) Ampere turns

20 / 20

Category: AC Fundamental

20. Absolute permittivity of dielectric medium is represented as –

A) εr /ε0

B) εr

C) ε0 εr

D) ε0

Your score is

The average score is 78%

LinkedIn Facebook Twitter VKontakte

0 votes, 0 avg

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. The principle of electromagnetic induction was propounded by

A) Faraday

B) Edison

C) Orsted

D) Flemmings

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 increasing current

B) Produce current opposite to the increasing current

C) Aid the applied voltage

D) Tend to decrease the amount of 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) Newton

B) Lenz

C) Coulomb

D) Faraday

4 / 4

Category: Magnetic Circuit

4. An open coil has –

A) Zero resistance and high inductance

B) Zero resistance and inductance

C) Infinite resistance and zero inductance

D) Infinite resistance and normal inductance

Your score is

The average score is 64%

LinkedIn Facebook Twitter VKontakte

0 votes, 0 avg

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) Motor

B) Generator

C) Transformer

D) Battery

2 / 6

Category: DC Machines

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

A) Transformer

B) Generator

C) Choke

D) Thermo-couple

3 / 6

Category: AC Fundamental

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

A) High Inductance

B) High impedance

C) High capacitance

D) Low impedance

4 / 6

Category: Basic Electricity

4. Electrolysis is possible with –

A) none

B) A.C supply only

C) both A.C and D.C supply

D) D.C supply only

5 / 6

Category: Magnetic Circuit

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

A) Mutual inductance

B) None

C) Capacitance

D) Self-inductance

6 / 6

Category: Magnetic Circuit

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

A) Rate of change of flux

B) Coil resistance

C) None

D) Flux magnitude

Your score is

The average score is 70%

LinkedIn Facebook Twitter VKontakte

/12

0 votes, 0 avg

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) 1/2 CV^2

B) Q^2 / 2C

C) 1/2 QV

D) All of the above

3 / 12

Category: Magnetic Circuit

3. 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) 90 J

C) 60 J

D) 15 J

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

4 / 12

Category: Magnetic Circuit

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

A) 1.5 V

B) 2.5 V

C) 5 V

D) 3.5 V

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

5 / 12

Category: Magnetic Circuit

5. 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/2

B) I/4

C) 0

D) I

6 / 12

Category: Magnetic Circuit

6. 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/2

B) 0

C) I

D) I/4

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

7 / 12

Category: Magnetic Circuit

7. 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) 160 J

B) 220 J

C) 150 J

D) 190 J

Hints:

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

8 / 12

Category: Magnetic Circuit

8. Higher the self-inductance of a coil –

A) longer the delay in establishing steady current through it

B) Greater the flux produced by it

C) Lesser its Weber-turns

D) lower the E.M.F. induced

9 / 12

Category: Magnetic Circuit

9. 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) quadrupled

D) doubled

10 / 12

Category: Magnetic Circuit

10. 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) initially increase and then decrease

C) decrease

D) Increase

11 / 12

Category: Magnetic Circuit

11. 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) LI^2/ 2t

D) L / 2I^2 t

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

12 / 12

Category: Magnetic Circuit

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

A) LI^2

B) IL^2

C) L^2 I / 2

D) LI^2 / 2

Your score is

The average score is 75%

LinkedIn Facebook Twitter VKontakte

0 votes, 0 avg

Created on October 14, 2022 By

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: DC Machines

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

A) Left hand thumb rule

B) Flemmings Right hand rule

C) Flemmings Left hand rule

D) Pulm rule

2 / 5

Category: DC Machines

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

A) Palm rule

B) Flemmings Right hand rule

C) Left hand thumb rule

D) Flemmings Left hand rule

3 / 5

Category: Magnetic Circuit

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

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

B) The piece of metal will lose it magnetism

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: Magnetic Circuit

4. A magnetic field like this is called –

A) a paramagnetic field

B) A uniform field

C) A parallel field

D) a distorted field

5 / 5

Category: Magnetic Circuit

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

A) Faraday's Right Hand Rule

B) Fleming's Right Hand Rule

C) Faraday's Left Hand Rule

D) Fleming's Left Hand Rule

Your score is

The average score is 72%

LinkedIn Facebook Twitter VKontakte

0 votes, 0 avg

Created on October 14, 2022 By

Electrical Notebook

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) 2 kWh

B) 5 kWh

C) 1 kWh

D) 4 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) 0.005 kWh

B) 5 kWh

C) 0.05 kWh

D) 0.05 Wh

Hints:

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

Your score is

The average score is 75%

LinkedIn Facebook Twitter VKontakte