electromagnetic induction

Question 1

What does AC stand for in AC generator?

Answer 1

Alternating Current

Question 2

True or False: A DC motor converts electrical energy into mechanical energy.

Answer 2

True

Question 3

Fill in the blank: Electromagnetic induction is the process of generating an electric current by __________ a magnetic field.

Answer 3

changing

Question 4

What type of current does a DC motor use?

Answer 4

Direct Current

Question 5

Which principle is the basis for the operation of an AC generator?

Answer 5

Faraday’s Law of Electromagnetic Induction

Question 6

What is the main component of an AC generator that rotates to produce electricity?

Answer 6

Rotor

Question 7

Multiple Choice: What is typically used to produce a magnetic field in a DC motor? A) Battery B) Magnet C) Coil D) All of the above

Answer 7

D) All of the above

Question 8

What is the primary purpose of an AC generator?

Answer 8

To convert mechanical energy into electrical energy

Question 9

True or False: In an AC generator, the direction of current flow changes periodically.

Answer 9

True

Question 10

What phenomenon does electromagnetic induction rely on?

Answer 10

The relative motion between a conductor and a magnetic field

Question 11

Fill in the blank: The frequency of an AC signal is measured in __________.

Answer 11

Hertz (Hz)

Question 12

What is the role of brushes in a DC motor?

Answer 12

To conduct current between the stationary and rotating parts

Question 13

Multiple Choice: Which of the following is NOT a property of waves? A) Wavelength B) Frequency C) Voltage D) Amplitude

Answer 13

C) Voltage

Question 14

What type of wave is produced by an AC generator?

Answer 14

Sine wave

Question 15

True or False: Electromagnetic induction can occur without physical contact between the conductor and the magnetic field.

Answer 15

True

Question 16

What is the unit of measurement for inductance?

Answer 16

Henry (H)

Question 17

Fill in the blank: The __________ of a wave is the distance between two consecutive crests.

Answer 17

wavelength

Question 18

What is the main advantage of using AC over DC in power transmission?

Answer 18

AC can be easily transformed to different voltages

Question 19

What is the main disadvantage of a DC motor compared to an AC motor?

Answer 19

DC motors require more maintenance due to brush wear

Question 20

Multiple Choice: Which of the following describes the amplitude of a wave? A) The speed of the wave B) The maximum displacement from the rest position C) The time period of the wave D) The frequency of the wave

Answer 20

B) The maximum displacement from the rest position

Question 21

What is the formula for calculating the frequency of a wave?

Answer 21

Frequency = 1 / Period

Question 22

True or False: The output voltage of an AC generator is constant.

Answer 22

False

Question 23

What is a common application of electromagnetic induction?

Answer 23

Transformers

Question 24

Fill in the blank: In electromagnetic induction, a change in magnetic flux induces an __________ in the circuit.

Answer 24

electromotive force (EMF)

Question 25

What does the term 'back EMF' refer to in a DC motor?

Answer 25

The voltage generated by the motor that opposes the applied voltage

Question 26

Multiple Choice: What is the primary disadvantage of using AC in some applications? A) It is more efficient B) It requires transformers C) It cannot be stored D) It is more dangerous

Answer 26

B) It requires transformers

Question 27

What is the effect of increasing the speed of rotation in an AC generator?

Answer 27

It increases the output voltage