MCQ Quiz on Fundamental of Electrical & Electronics Engineering

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Unit- 1 : Electric and Magnetic Circuits

/20

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332

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

If the length of a wire is doubled and diameter is halved, then the resistance will become –

A) 4 times

B) 32 times

C) 16 times – of the previous

D) 8 times

2 / 20

Category: Basic Electricity

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

A) 8 times

B) 16 times

C) 4 times

D) 32 times

3 / 20

Category: Basic Electricity

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

A) Total current in the circuit will increase

B) all the three will glow

C) no bulb will glow

D) The other two lamps will glow

4 / 20

Category: Basic Electricity

The Inductor doesn’t allow sudden changes in

A) Voltage

B) Inductance

C) Current

D) Resistance

5 / 20

Category: Basic Electricity

Resistance of any circuit depends on –

A) Inversely proportionate with length and cross sectional area

B) Directly proportionate with length and cross sectional area

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

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

6 / 20

Category: Basic Electricity

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

A) a resistor

B) a short circuit

C) a normal capacitor as in AC

D) open circuit

7 / 20

Category: Basic Electricity

Which, among the following is a unit for resistivity?

A) ohm/meter

B) ohm/meter^2

C) ohm-meter^2

D) ohm-meter

8 / 20

Category: Basic Electricity

The capacitor doesn’t allow sudden changes in

A) Current

B) Voltage

C) Resistance

D) Capacitance

9 / 20

Category: Basic Electricity

Color code for 1 ohm +-10% resistor is

A) Brown Black Golden Golden

B) Black Brown Black Golden

C) Brown Black Golden Silver

D) Black Brown Black Silver

10 / 20

Category: Basic Electricity

The formula used to find the capacitance C is __________

A) Q + v

B) Q-v

C) Qv

D) Q/v

11 / 20

Category: Basic Electricity

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

A) R= l/( ρ.a)

B) R= a/( ρ.l)

C) R= ρ. (a/l)

D) R=ρ. (l/a)

12 / 20

Category: Basic Electricity

The resistance of straight conductor is independent of-

A) Cross-sectional area

B) Shape of cross-section

C) Material

D) Temperature

13 / 20

Category: Basic Electricity

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 15 sqm wire has higher resistance

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

C) The 10 sqm wire has higher resistance

D) Both have equal resistance

14 / 20

Category: Basic Electricity

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) 16 ohm-meter

B) 16 kiloohm-meter

C) 8 kilo ohm-meter

D) 8 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

In a pure inductive circuit current is

A) Lags by voltage by 0°

B) Lags behind Voltage by 90°

C) Leads by voltage by 0°

D) Leads by voltage by 90°

16 / 20

Category: Basic Electricity

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

A) Electrode

B) Capacitive medium

C) Dielectric

D) Conducting medium

17 / 20

Category: Basic Electricity

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

A) R= l/( ρ.a)

B) R=ρ. (l/a)

C) R= ρ. (a/l)

D) R= a/( ρ.l)

18 / 20

Category: Basic Electricity

If a capacitor of capacitance 9.2F has a voltage of 22.5V across it. Calculate the energy of the capacitor.

A) 50625 W

B) 5062.5 W

C) 506.25 W

D) 50.625 W

Apply E= ½ cv².

19 / 20

Category: Basic Electricity

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

A) 60 J

B) 20 J

C) 15 J

D) 90 J

20 / 20

Category: Basic Electricity

The reciprocal of resistivity is________

A) Resistance

B) Conductance

C) Conductivity

D) Impedance

Your score is

The average score is 40%

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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

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

A) True

B) False

2 / 20

Category: Basic Electricity

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

A) 2.66 V

B) 4 V

C) 18.8 V

D) 26.6 V

3 / 20

Category: Basic Electricity

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

A) 1%

B) 25%

C) 100%

D) 50%

4 / 20

Category: Basic Electricity

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

A) 10 Hz

B) 1,000 Hz

C) 50 Hz

D) 100 Hz

Hints:

Frequency = 1/time period

5 / 20

Category: Basic Electricity

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

A) 2 μs

B) 100 μs

C) 20 μs

D) 4 μs

6 / 20

Category: Basic Electricity

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) 45°

B) 0°

C) 40°

D) None of the above

7 / 20

Category: Basic Electricity

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

A) 50.96 V

B) 14.14 V

C) 6.37 V

D) 25.48 V

8 / 20

Category: Basic Electricity

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

A) 1%

B) Cannot be determined

C) 30%

D) 100%

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

A phasor represents

A) The magnitude and a quantity direction

B) The width of a quantity

C) The phase angle

D) The magnitude of a quantity

10 / 20

Category: Basic Electricity

Amplitude is the maximum value of a voltage or current

A) True

B) False

11 / 20

Category: Basic Electricity

The unit of frequency is the hertz

A) False

B) True

12 / 20

Category: Basic Electricity

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

A) 12 cycles

B) 1,200 cycles

C) 1/100 cycle

D) 120 cycles

13 / 20

Category: Basic Electricity

A 1 kHz signal has a period of 1 ms

A) False

B) True

14 / 20

Category: Basic Electricity

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

A) 39.6 mA

B) 45.12 mA

C) 22.6 mA

D) 16 mA

15 / 20

Category: Basic Electricity

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

A) False

B) True

16 / 20

Category: Basic Electricity

How many degrees are there in π/3 rad?

A) 6°

B) 60°

C) 27°

D) 180°

17 / 20

Category: Basic Electricity

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

A) 1 mA

B) 1.5 mA

C) 15 mA

D) 10 mA

18 / 20

Category: Basic Electricity

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

19 / 20

Category: Basic Electricity

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

A) True

B) False

20 / 20

Category: AC Fundamental

The length of a phasor represents the amplitude

A) True

B) False

Your score is

The average score is 43%

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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

Many resistors connected in series will?

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

B) Divide the voltage proportionally among all the resistor

C) Reduce the power to zero

D) Divide the current proportionally

2 / 16

Category: Basic Electricity

The energy per unit charge is

A) Current

B) Power

C) Voltage

D) Work

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

3 / 16

Category: Basic Electricity

Which is the most cost efficient connection?

A) Either series or parallel

B) Series

C) Neither series nor parallel

D) Parallel

4 / 16

Category: Basic Electricity

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

A) Series

B) Either series or parallel

C) Neither series nor parallel

D) Parallel

5 / 16

Category: Basic Electricity

Active circuit have -

A) none of these

B) either a or b

C) one current source

D) one voltage source

6 / 16

Category: Basic Electricity

Ideal voltage source has-

A) High internal resistance

B) Zero internal resistance

C) Low internal resistance

D) Infinity internal resistance

7 / 16

Category: Basic Electricity

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

A) Either series or parallel

B) Neither series nor parallel

C) Series

D) Parallel

8 / 16

Category: Basic Electricity

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

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

A) Equal in all branches

B) Proportional to the power in the circuit

C) Proportional to the value of the resistors

D) The amount of time the circuit

10 / 16

Category: Basic Electricity

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

A) Infinite

B) Zero

C) Null

D) The value of the source voltage

11 / 16

Category: Basic Electricity

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

12 / 16

Category: Basic Electricity

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

13 / 16

Category: Basic Electricity

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

A) It becomes half its original value

B) It becomes double its original value

C) It becomes infinity

D) It becomes zero

14 / 16

Category: Basic Electricity

Ideal voltage source has-

A) Zero internal resistance

B) Low internal resistance

C) High internal resistance

D) Infinity internal resistance

15 / 16

Category: Basic Electricity

Batteries are generally connected in______

A) Parallel

B) Either series or parallel

C) Neither series nor parallel

D) Series

16 / 16

Category: Basic Electricity

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 stops glowing

D) The other bulb also burns out

Your score is

The average score is 40%

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/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

Calculate the equivalent resistance between A and B

A) 46.67 ohm

B) 10.67 ohm

C) 6.67 ohm

D) 26.67 ohm

Hints:

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

2 / 16

Category: Basic Electricity

The total resistance between A and B are?

A) 0 ohm

B) 80 ohm

C) 20 ohm

D) 5 ohm

3 / 16

Category: Basic Electricity

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.

4 / 16

Category: Basic Electricity

Calculate the total current in the circuit

A) 11.43 A

B) 20 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

Find the current in the circuit.

A) 3 A

B) 2 A

C) 1 A

D) 4 A

6 / 16

Category: Basic Electricity

Calculate the equivalent resistance between A and B

A) 8 ohm

B) 6 ohm

C) 4 ohm

D) 2 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

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

A) 5 ohm

B) 135 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.

8 / 16

Category: Basic Electricity

Calculate the current across the 20 ohm resistor

A) 6.67 A

B) 20 A

C) 36.67 A

D) 10 A

9 / 16

Category: Basic Electricity

The voltage across the short is?

A) Infinity

B) 135 V

C) Zero

D) 11.25 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.

10 / 16

Category: Basic Electricity

Calculate the total resistance between the points A and B.

A) 0 ohm

B) 0.48 ohm

C) 7 ohm

D) 7.67 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.

11 / 16

Category: Basic Electricity

The voltage across the open circuit is?

A) 0 V

B) Infinity

C) 100 V

D) 90 V

12 / 16

Category: Basic Electricity

Calculate the resistance between A and B

A) 7 ohm

B) 3.56 ohm

C) 14.26 ohm

D) 29.69 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.

13 / 16

Category: Basic Electricity

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) 0 A

B) Insufficient data provide

C) 12 A

D) The largest one among the three values

Hints:

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

14 / 16

Category: Basic Electricity

Voltage across the 60 ohm resistor is______

A) 0 V

B) 48 V

C) 72 V

D) 120 V

15 / 16

Category: Basic Electricity

Find the voltage across the 6 ohm resistor

A) 150 V

B) 54.48 V

C) 27.27 V

D) 181.6 V

16 / 16

Category: Basic Electricity

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

A) 75 ohm

B) 25 ohm

C) 15 ohm

D) 55 ohm

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

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

A) Electromotive difference

B) voltage

C) Electromotive force

D) Magnetomotive force

2 / 13

Category: Basic Electricity

The flow of electron in solids is due to –

A) positive charges

B) Atoms

C) electrons & ions

D) electrons

3 / 13

Category: Basic Electricity

Insulating material can –

A) Store varying voltage

B) Protect a short circuit between two conductors

C) Conduct very large current

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

4 / 13

Category: Basic Electricity

1 coulomb charge equals the charge of –

A) 6.24×10^12 electrons

B) 6.24×10^16 electrons

C) 6.24×10^-18 electrons

D) 6.24×10^18 electrons

5 / 13

Category: Basic Electricity

S.I unit of Power is –

A) Watt-hr

B) Watt

C) Joule

D) Coulomb

6 / 13

Category: Basic Electricity

Instantaneous power in inductor is proportional to the –

A) Square of rate of change of current

B) Temperature of the inductor

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

D) Square of instantaneous current

7 / 13

Category: Basic Electricity

KWh is the unit of -

A) Work

B) Power

C) Energy

D) Efficiency

8 / 13

Category: Basic Electricity

Current & Potential Difference both can be measured using –

A) Ohmmeter

B) Ammeter

C) Multimeter

D) Voltmeter

9 / 13

Category: Basic Electricity

In case of D.C –

A) Direction of current changes with time

B) Magnitude of current changes with time

C) Magnitude and direction both change with time

D) Magnitude and direction remains constant

10 / 13

Category: Basic Electricity

Electric pressure is also called –

A) Voltage

B) Energy

C) Conductance

D) Resistance

11 / 13

Category: Basic Electricity

S.I unit of conductance is –

A) Mho-m

B) Ohm-m

C) Mho

D) Ohm

12 / 13

Category: Basic Electricity

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) The other two lamps will glow

D) all the three will glow

13 / 13

Category: AC Fundamental

Average power taken by a pure capacitor is –

A) Minimum

B) Maximum

C) Unity

D) Zero

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

Paramagnetic materials are –

A) none

B) Strongly attracted by a magnet

C) slightly attracted by a magnet

D) strongly repelled by a magnet

2 / 20

Category: Magnetic Circuit

Magnetic circuit is a closed path followed by –

A) None of these

B) M.M.F

C) flux

D) Flux density

3 / 20

Category: Magnetic Circuit

Hysteresis loss least depends on –

A) steinmetz coefficient of material

B) ambient temperature

C) volume of material

D) frequency

4 / 20

Category: Magnetic Circuit

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

A) Solenoid

B) Multi turn coil

C) Insulator

D) both a and c

5 / 20

Category: Magnetic Circuit

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

A) its high retentivity

B) molecular friction

C) flux density lagging behind magnetising force

D) rapid reversals of its magnetisation

6 / 20

Category: Magnetic Circuit

Unit of magnetic flux density is in S.I.

A) WB/m²

B) Oersted

C) Tesla

D) Both A & B

7 / 20

Category: Magnetic Circuit

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

A) Emf

B) None

C) Voltage drop

D) Current

8 / 20

Category: Magnetic Circuit

The unit of magnetic flux is –

A) Tesla

B) Ampere turns

C) Henry

D) Weber

9 / 20

Category: Magnetic Circuit

Which of the following is unit less?

A) Permittivity

B) Magnetic susceptibility

C) Moment of Magnet

D) Permeability

10 / 20

Category: Magnetic Circuit

In a electric circuit MMF is similar to

A) Flux

B) Current

C) Electromotive force

D) Resistance

11 / 20

Category: Magnetic Circuit

Magnetic lines of forces –

A) often intersect

B) never intersect

C) intersect only in some special circumstances

D) are not predictable

12 / 20

Category: Magnetic Circuit

Strength of the electromagnet can be increased by increasing –

A) number of turns in the circuit

B) Reluctance

C) either b or c

D) Magnitude of current

13 / 20

Category: Magnetic Circuit

S.I unit of Reluctance-

A) N/Wb

B) AT

C) AT/Wb

D) AT/m

14 / 20

Category: Magnetic Circuit

Magnetic field strength is

A) N.i / L

B) N.i

C) N.ø/I

D) None of these

15 / 20

Category: Magnetic Circuit

The reciprocal of permeability is –

A) reluctivity

B) Conductivity

C) MMF

D) Resistivity

16 / 20

Category: Magnetic Circuit

Magnetic field has -

A) none

B) only magnitude

C) both magnitude & direction

D) Only direction

17 / 20

Category: Magnetic Circuit

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

A) Electric magnets

B) Electromagnetic fields

C) Electromagnets

D) Electromagnetism field

18 / 20

Category: Magnetic Circuit

Magnetic field is proportional to the –

A) all of these

B) Speed of electric charges

C) direction of electric charges

D) Quality of electric charges

19 / 20

Category: Basic Electricity

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

A) Low

B) high

C) zero

D) unity

20 / 20

Category: AC Fundamental

Absolute permittivity of dielectric medium is represented as –

A) ε0 εr

B) ε0

C) εr

D) εr /ε0

Your score is

The average score is 48%

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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

An open coil has –

A) Infinite resistance and normal inductance

B) Zero resistance and inductance

C) Zero resistance and high inductance

D) Infinite resistance and zero inductance

2 / 4

Category: Magnetic Circuit

The principle of electromagnetic induction was propounded by

A) Edison

B) Orsted

C) Faraday

D) Flemmings

3 / 4

Category: Magnetic Circuit

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

A) Newton

B) Coulomb

C) Lenz

D) Faraday

4 / 4

Category: Magnetic Circuit

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

A) Aid the increasing current

B) Aid the applied voltage

C) Tend to decrease the amount of current

D) Produce current opposite to the increasing current

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: Basic Electricity

Electrolysis is possible with –

A) both A.C and D.C supply

B) A.C supply only

C) none

D) D.C supply only

2 / 6

Category: AC Fundamental

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

A) High Inductance

B) High capacitance

C) Low impedance

D) High impedance

3 / 6

Category: Magnetic Circuit

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

A) Coil resistance

B) None

C) Rate of change of flux

D) Flux magnitude

4 / 6

Category: Magnetic Circuit

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

5 / 6

Category: AC Machines & Transformer

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

A) Transformer

B) Battery

C) Generator

D) Motor

6 / 6

Category: DC Machines

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

A) Thermo-couple

B) Transformer

C) Generator

D) Choke

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The average score is 50%

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/12

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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: Magnetic Circuit

Energy stored in a magnetic field is given by –

A) LI^2 / 2

B) IL^2

C) L^2 I / 2

D) LI^2

2 / 12

Category: Magnetic Circuit

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) quadrupled

C) halved

D) doubled

3 / 12

Category: Magnetic Circuit

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) I/2

C) I

D) 0

4 / 12

Category: Magnetic Circuit

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) 90 J

D) 60 J

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

5 / 12

Category: Magnetic Circuit

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) decrease

B) initially increase and then decrease

C) Increase

D) Remain the same

6 / 12

Category: Magnetic Circuit

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

A) 5 V

B) 1.5 V

C) 2.5 V

D) 3.5 V

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

7 / 12

Category: Magnetic Circuit

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) L / 2I^2 t

B) L / 2It

C) LI / 2t

D) LI^2/ 2t

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

8 / 12

Category: Magnetic Circuit

Higher the self-inductance of a coil –

A) Greater the flux produced by it

B) lower the E.M.F. induced

C) Lesser its Weber-turns

D) longer the delay in establishing steady current through it

9 / 12

Category: Magnetic Circuit

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) 190 J

B) 150 J

C) 220 J

D) 160 J

Hints:

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

10 / 12

Category: Magnetic Circuit

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) 0

B) I

C) I/4

D) I/2

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

11 / 12

Category: AC Fundamental

In a capacitor, the electrical energy is stored in –

A) electric field

B) Magnetic field

C) both a and b

D) none

12 / 12

Category: AC Fundamental

The energy stored by a capacitor is given by –

A) Q^2 / 2C

B) All of the above

C) 1/2 CV^2

D) 1/2 QV

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The average score is 51%

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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

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

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

B) The piece of metal will lose it magnetism

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

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

2 / 5

Category: Magnetic Circuit

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 Left Hand Rule

C) Fleming's Right Hand Rule

D) Faraday's Right Hand Rule

3 / 5

Category: Magnetic Circuit

A magnetic field like this is called –

A) A parallel field

B) a paramagnetic field

C) A uniform field

D) a distorted field

4 / 5

Category: DC Machines

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

A) Pulm rule

B) Flemmings Left hand rule

C) Flemmings Right hand rule

D) Left hand thumb rule

5 / 5

Category: DC Machines

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

A) Flemmings Right hand rule

B) Palm rule

C) Flemmings Left hand rule

D) Left hand thumb rule

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The average score is 43%

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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

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) 5 kWh

B) 2 kWh

C) 1 kWh

D) 4 kWh

Hints:

Input= 4 kWh+20% = 5 kWh

2 / 2

Category: Basic Electricity

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

A) 0.005 kWh

B) 0.05 Wh

C) 0.05 kWh

D) 5 kWh

Hints:

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

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The average score is 42%

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Unit- 3 : AC Circuits

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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

Real part and imaginary part of admittance are respectively –

A) Resistance and Reactance

B) Reluctance and Permeance

C) Conductance, Susceptance

D) Permeance and Susceptance

2 / 20

Category: AC Fundamental

Capacitive Susceptance is a measure of –

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

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

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

D) Reactive power in a circuit

3 / 20

Category: AC Fundamental

For a sinusoidal AC voltage, amplitude factor is –

A) 0.707

B) 0.637

C) 1.11

D) 1.414

Hints:

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

4 / 20

Category: AC Fundamental

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

A) None

B) 1 Hz

C) 2π Hz

D) π Hz

Hints:

v= Vm sin 2πft volt

here f=1 Hz

5 / 20

Category: AC Fundamental

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

A) 360°

B) 90°

C) 180°

D) 0°

6 / 20

Category: AC Fundamental

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

A) None

B) I R.M.S.

C) I average value

D) I max Lm value

7 / 20

Category: AC Fundamental

Form factor of half wave rectified ac is-

A) 1.11

B) 1.57

C) 2

D) 1.41

8 / 20

Category: AC Fundamental

In a circuit containing R, L and C, power loss can take place in –

A) L only

B) R only

C) All of these

D) C only

9 / 20

Category: AC Fundamental

The form factor for a sinusoidal a.c. voltage is –

A) 1

B) 1.41

C) 1.11

D) 0.707

10 / 20

Category: AC Fundamental

Form factor of square wave is-

A) 1

B) 1.41

C) 2

D) 1.47

11 / 20

Category: AC Fundamental

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

A) Average voltage

B) Peak voltage

C) None

D) RMS voltage

12 / 20

Category: AC Fundamental

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

A) Voltage

B) Charge transfer

C) Heating effect

D) Current

13 / 20

Category: AC Fundamental

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

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

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

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

D) None

14 / 20

Category: AC Fundamental

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

A) 282.8 V

B) 200 V

C) 141.4 V

D) 127.4 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

15 / 20

Category: AC Fundamental

A current is set to be alternating when it changes –

A) Magnitude only

B) Both magnitude and direction

C) Direction only

D) None

16 / 20

Category: AC Fundamental

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

17 / 20

Category: AC Fundamental

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

A) Heating effect

B) Charge transfer

C) Voltage

D) Current

18 / 20

Category: AC Fundamental

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

A) 30 Hz

B) 50 Hz

C) 5 Hz

D) 20 Hz

19 / 20

Category: AC Fundamental

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

A) Voltage

B) Current

C) Heating effect

D) Charge transfers

20 / 20

Category: AC Fundamental

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

A) 141 A

B) 282.8 A

C) 70.7 A

D) 150 A

Hints: Peak factor of sine wave = 1.41

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

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The average score is 35%

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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: AC Fundamental

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

A) 0.01 sec

B) 0.06 sec

C) 0.05 sec

D) 0.04 sec

Hints:

2πf= 628

f=628/2π = 99.94 Hz

t= 1/f = 0.01 sec

2 / 4

Category: AC Fundamental

The frequency of an AC voltage in India, is–

A) 100 Hz

B) 50 Hz

C) 314 Hz

D) 75 Hz

3 / 4

Category: AC Fundamental

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

A) 60 Hz

B) None

C) 50 Hz

D) 25 Hz

Hints:

2πf = 314

f= 314/2π = 49.97 Hz = 50 Hz

4 / 4

Category: Basic Electricity

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

A) 70.72 A

B) 707.2 A

C) 100 A

D) 7.07 A

Hints:

from peak factor,

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

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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

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

A) R only

B) L only

C) R-L-C all

D) C only

2 / 5

Category: AC Fundamental

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

3 / 5

Category: AC Fundamental

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) Voltage across R and L are in phase

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

4 / 5

Category: AC Fundamental

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

A) All of these

B) P/S

C) R/Z

D) Vr/V

5 / 5

Category: Basic Electricity

For a sinusoidal AC voltage, amplitude factor is –

A) 1.11

B) 1.414

C) 0.637

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

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

A) R/Z

B) All of the above

C) P/S

D) Vr /V

2 / 5

Category: AC Fundamental

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

A) C only

B) R-L-C all

C) L only

D) R only

3 / 5

Category: AC Fundamental

For a sinusoidal AC voltage, amplitude factor is –

A) 0.637

B) 1.11

C) 1.414

D) 0.707

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

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

A) leads the current

B) 90° lags the current

C) 90° leads the current

D) lags the current

5 / 5

Category: AC Fundamental

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

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

B) Voltage across R and L are in phase

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

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

In an inductive circuit current always lag behind the voltage.

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The average score is 49%

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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: Circuit Theory & Network

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

A) Zero

B) Minimum

C) Maximum

D) a very small amount

2 / 20

Category: Circuit Theory & Network

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

A) Active component of current

B) True component of current

C) none

D) Watt-less component of current

3 / 20

Category: Circuit Theory & Network

A parallel AC circuit in resonance will –

A) Act like a resister of low value

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

C) Have a high impedance

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

4 / 20

Category: Circuit Theory & Network

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

A) 0.111

B) 1.111

C) 0.81

D) 1

Q factor is the reciprocal of the power factor

5 / 20

Category: Circuit Theory & Network

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) Unity

C) Zero

D) Leading

6 / 20

Category: Circuit Theory & Network

In any AC circuit always –

A) Reactive power is more than apparent power

B) Reactive power is more than actual power

C) Actual power is more than reactive power

D) Apparent power is more than actual power

7 / 20

Category: Circuit Theory & Network

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

A) Resonant frequency

B) Q

C) None

D) Bandwidth

Resonent frequency = 1/2π √(L/C)

8 / 20

Category: AC Fundamental

The power factor of practical inductor is

A) Lagging

B) Leading

C) Zero

D) Unity

9 / 20

Category: AC Fundamental

The power factor of an AC circuit lies between –

A) -1 and 1

B) None of these

C) 0 and 1

D) 0 and -1

10 / 20

Category: AC Fundamental

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

A) Unity power factor

B) High power factor

C) Maximum load current

D) Low efficiency

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

11 / 20

Category: AC Fundamental

The power factor of an ordinary electric bulb is

A) Slightly less than unity

B) Unity

C) Slightly more than unity

D) Zero

Ordinary bulb means incandescent lamp or GLS lamp. The lamp glows on the basis of heating effect of resistance. The tungsten wire is used in coiled coil form in the bulb. Which is slightly inductive in nature, so the power factor is near about unity not purely unity, i.e. 0.98 to 0.99

12 / 20

Category: AC Fundamental

Reactive power is the product of

A) V, I

B) V, I, cos ø

C) V, I, tan ø

D) V, I, sin ø

13 / 20

Category: AC Fundamental

From the following when capacitive reactance will be more?

A) capacitance is less & supply frequency is more

B) capacitance & supply frequency is more

C) Capacitance is more & supply frequency is less

D) Capacitance & supply frequency is less

Xc= 1/2πfC

14 / 20

Category: AC Fundamental

If the inductive reactance of a coil is 6 ohm and internal resistance is 8 ohm, then the impedance will be –

A) 2 ohm

B) 2 ohm

C) 10 ohm

D) 14 ohm

Z= √ (6^2+8^2) = 10 Ohm

15 / 20

Category: AC Fundamental

Capacitors for power factor correction are rated in -

A) KVA

B) KVAR

C) KW

D) VA

16 / 20

Category: AC Fundamental

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

A) Loss of energy in dielectric

B) Ohmic loss due to Ohmic resistance of plates

C) Capacitive reactance in ohms

D) both A and B

17 / 20

Category: AC Fundamental

An electric incandescent lamp has the power factor of –

A) zero

B) unity

C) leading

D) Lagging

18 / 20

Category: AC Fundamental

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

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

B) R/Z

C) All of the above

D) Vr/V

19 / 20

Category: AC Fundamental

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

A) Average power

B) Real power

C) all of the above

D) True power

20 / 20

Category: Basic Electricity

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

A) True power

B) Apparent power

C) none of the above

D) Reactive power

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2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

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1 / 2

Category: AC Machines & Transformer

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

A) 75%

B) 57.7%

C) 100%

D) 66.7%

2 / 2

Category: Basic Electricity

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

A) 2 ohm

B) 6 ohm

C) 18 ohm

D) 9 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

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

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

Fundamentals of Electrical & Electronics Engineering

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FEEE Unit-4.4 : Auto-transformers

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FEEE Unit-4.5 : Construction and working principle of motors

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FEEE Unit-4.6 : Types of motors and applications

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

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

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