Electronics - Magnetism and Electromagnetism

Exercise :: Magnetism and Electromagnetism - General Questions

6. 

The Hall effect

A. is a phenomenon with no practical applications
B. is used in various sensor applications
C. can develop potentials of thousands of volts
D. is the basis for solar cell operation

Answer: Option B

Explanation:

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7. 

"Series" and "parallel" as applied to dc motors refer to

A. the connection of the motor and controller
B. the connection of the field coil and armature windings
C. the connection of the brush and commutator
D. the connection of the motor batteries

Answer: Option B

Explanation:

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8. 

The component that produces power in an electromagnetic generator is called the

A. armature
B. field winding
C. commutator
D. brush

Answer: Option A

Explanation:

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9. 

What is the magnetomotive force in a 150-turn coil of wire with 2 A flowing through it?

A. 13.33 mAt
B. 300 At
C. 75 At
D. 152 At

Answer: Option B

Explanation:

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10. 

A Hall effect sensor

A. exists only in theory
B. is a noncontacting magnetic sensor
C. can operate only a few times before failure
D. produces very large voltages

Answer: Option B

Explanation:

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