Electrical Inductors MCQ Questions & Answers | Electrical Engineering Page-2 section-1

11.
Faraday's law states that relative motion between a magnetic field and a coil induces a voltage across the coil.

A. True

B. False

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12.
Inductance is indirectly proportional to the square of the number of turns, the permeability, and the cross-sectional area of the core.

A. True

B. False

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13.
A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current

A. Is increased

B. Is decreased

C. Does not change

D. Momentarily goes to zero

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14.
The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is

A. 1.8 mV

B. 18 mV

C. 180 mV

D. 1.25 mV

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15.
Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?

A. 219 kΩ

B. 66 kΩ

C. 660 kΩ

D. 1.3 MΩ

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16.
Energy is stored by an inductor in an electrostatic field.

A. True

B. False

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17.
XL is directly proportional to frequency and inductance.

A. True

B. False

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18.
All coil cores are made of iron.

A. True

B. False

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19.
The term 'choke' is more commonly used in connection with an inductor used to block off high frequencies.

A. True

B. False

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20.
A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?

A. 91 mA

B. 78 mA

C. 57 mA

D. 400 mA

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Electrical Inductors MCQ Questions & Answers | Electrical Engineering

11. Faraday's law states that relative motion between a magnetic field and a coil induces a voltage across the coil.

Answer & Solution

12. Inductance is indirectly proportional to the square of the number of turns, the permeability, and the cross-sectional area of the core.

Answer & Solution

13. A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current

Answer & Solution

14. The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is

Answer & Solution

15. Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?

Answer & Solution

16. Energy is stored by an inductor in an electrostatic field.

Answer & Solution

17. XL is directly proportional to frequency and inductance.

Answer & Solution

18. All coil cores are made of iron.

Answer & Solution

19. The term 'choke' is more commonly used in connection with an inductor used to block off high frequencies.

Answer & Solution

20. A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?

Answer & Solution

11.
Faraday's law states that relative motion between a magnetic field and a coil induces a voltage across the coil.

12.
Inductance is indirectly proportional to the square of the number of turns, the permeability, and the cross-sectional area of the core.

13.
A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current

14.
The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is

15.
Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?

16.
Energy is stored by an inductor in an electrostatic field.

17.
XL is directly proportional to frequency and inductance.

18.
All coil cores are made of iron.

19.
The term 'choke' is more commonly used in connection with an inductor used to block off high frequencies.

20.
A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?