# Ac & DC Motor Video Questions

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Questions about material in AC and DC motors video

• 1.

### 'Basically, an electric motor is a device that converts

• A.

A. Mechanical energy into electrical energy

• B.

B. Heat energy into electrical energy

• C.

C. Electrical energy into mechanical energy

• D.

D. Mechanical energy into potential energy

C. C. Electrical energy into mechanical energy
Explanation
An electric motor is a device that uses electrical energy to produce mechanical energy. It does this by applying the principle of electromagnetism, where an electric current flowing through a wire creates a magnetic field. This magnetic field interacts with other magnetic fields, causing the motor to rotate and produce mechanical motion. Therefore, the correct answer is C. Electrical energy into mechanical energy.

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• 2.

### A magnetic field consists of a series of lines called what?

• A.

A. Magnetic lines of flux

• B.

B. Current lines

• C.

C. Polarity lines

• D.

D. Field nets

A. A. Magnetic lines of flux
Explanation
A magnetic field is represented by lines called magnetic lines of flux. These lines indicate the direction and strength of the magnetic field. They are used to visualize and understand the behavior of magnetic fields and are commonly used in diagrams and illustrations to represent magnetic fields.

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• 3.

### "The movement of an object as a result of the interaction of two separate magnetic fields is called what?"

• A.

A. Current flow

• B.

B. Motor action

• C.

C. Induction

• D.

D. Voltage

B. B. Motor action
Explanation
The movement of an object as a result of the interaction of two separate magnetic fields is called motor action. This term refers to the phenomenon where the interaction between the magnetic fields causes the object to move, typically in a rotational motion. It is commonly seen in electric motors, where the magnetic fields generated by the current flowing through the motor's coils interact with the magnetic field produced by a permanent magnet, resulting in the rotation of the motor's shaft.

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• 4.

### "What effect do two like magnetic poles have on each other?"

• A.

A. They attract each other

• B.

B. They dissipate each other's magnetic field.

• C.

C. They increase each other's magnetic field

• D.

D. They repel each other

D. D. They repel each other
Explanation
Two like magnetic poles repel each other because they have the same magnetic polarity. This means that the magnetic field lines produced by each pole are in the same direction, causing them to push against each other. This is in accordance with the law of magnetism, which states that like magnetic poles repel each other while unlike magnetic poles attract each other.

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• 5.

### "When is the attraction between two unlike magnetic poles the strongest?"

• A.

A. When they're closest to each other

• B.

B. When they're farthest away from each other

• C.

C. When they're 90 degrees from each other

• D.

D. When they've just passed each other

A. A. When they're closest to each other
Explanation
The attraction between two unlike magnetic poles is strongest when they are closest to each other. This is because the magnetic field lines are concentrated in a smaller area, resulting in a stronger magnetic force between the poles. As the distance between the poles increases, the magnetic force decreases. Therefore, when the poles are farthest away from each other, the attraction is weakest.

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• 6.

### "A magnetic field consists of a series of lines known as magnetic lines of

• A.

A. Voltage

• B.

B. Amperage

• C.

C. Flux

• D.

D. Thrust

C. C. Flux
Explanation
A magnetic field consists of a series of lines known as magnetic lines of flux. These lines represent the direction and strength of the magnetic field. The concept of magnetic flux is used to describe the total magnetic field passing through a given area. It is a measure of the number of magnetic field lines passing through a surface. Therefore, option C, flux, is the correct answer.

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• 7.

### Current that continually reverses direction is known as

• A.

A. AC

• B.

B. DC

• C.

C. EC

• D.

D. RC

A. A. AC
Explanation
Current that continually reverses direction is known as AC, which stands for Alternating Current. In an AC circuit, the flow of electrons periodically changes direction, oscillating back and forth. This type of current is commonly used in household electricity, as it allows for the efficient transmission of power over long distances. In contrast, DC (Direct Current) flows in only one direction and is commonly used in batteries and electronic devices. EC and RC are not recognized terms in the context of electrical currents.

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• 8.

### "When current flows through a wire that's shaped in the form of a coil, what happens to the individual flux lines that are produced?"

• A.

A. They are grounded.

• B.

B. They oppose each other

• C.

C. Together, they create one large magnetic field

• D.

D. They cancel each other

C. C. Together, they create one large magnetic field
Explanation
When current flows through a wire that's shaped in the form of a coil, the individual flux lines that are produced combine together to create one large magnetic field. This is because the coil shape of the wire causes the magnetic fields produced by each turn of the coil to align and reinforce each other, resulting in a stronger overall magnetic field.

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• 9.

### "A bar magnet rotates when alternating current flows through the coils. In terms of AC motor operation, the bar magnet can be referred to as what?"

• A.

A. Stator

• B.

B. Commutator

• C.

C. Rotor

• D.

D. Impeller

C. C. Rotor
Explanation
In an AC motor, the rotor is the part that rotates. It is typically made up of a bar magnet or a series of magnets. When alternating current flows through the coils, it creates a magnetic field that interacts with the magnetic field of the rotor, causing it to rotate. The stator, on the other hand, is the stationary part of the motor that contains the coils. The commutator is a device used in DC motors to switch the direction of the current flow. The impeller is a component used in pumps or fans to generate fluid flow.

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• 10.

### "A bar magnet rotates when alternating current flows through the coils. In terms of AC motor operation, the coils can be referred to as what?"

• A.

A. Motor controller

• B.

B. Commutator

• C.

C. Rotor

• D.

D. Stator

D. D. Stator
Explanation
The coils in an AC motor can be referred to as the stator. The stator is the stationary part of the motor that contains the coils. When alternating current flows through the coils, it creates a rotating magnetic field that interacts with the rotor, causing it to rotate. The stator plays a crucial role in converting electrical energy into mechanical energy in an AC motor. The other options, motor controller and commutator, are not directly related to the coils in an AC motor.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Nov 28, 2011
Quiz Created by
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