Magnetism and Electromagnetism - General Questions

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Magnetism and Electromagnetism - General Questions

1. 

The polarity of induced voltage while a field is collapsing is
A. independent of the force creating the field
B. opposite to the force creating the field
C. identical to the force creating the field
D. present only if the force is stationary

Answer: Option B

Explanation:

No answer description available for this question

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2. 

Which electromagnetic device contains an armature?
A. A speaker
B. A dc generator
C. A relay
D. A solenoid

Answer: Option B

Explanation:

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3. 

Which electromagnetic device has a movable iron core called a plunger?
A. A speaker
B. A dc generator
C. A relay
D. A solenoid

Answer: Option D

Explanation:

No answer description available for this question

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4. 

What do you call the characteristic of a magnetic material whereby a change in magnetization lags the application of a magnetizing force?
A. Hysteresis
B. Induction
C. Retentivity
D. Reluctance

Answer: Option A

Explanation:

No answer description available for this question

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5. 

The unit of flux density is known as
A. magnetomotive force
B. a weber
C. a maxwell
D. a tesla

Answer: Option D

Explanation:

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6. 

What is the reluctance of a material that has a length of 0.045 m, a cross-sectional area of 0.015 m2, and a permeability of 2500 µWb/At·m?
A. 833.33 µAt/Wb
B. 0.27 At/Wb
C. 1200 At/Wb
D. More information is needed in order to find the reluctance.

Answer: Option C

Explanation:

No answer description available for this question

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7. 

Which electromagnetic device has a flexible cone?
A. A speaker
B. A dc generator
C. A relay
D. A solenoid

Answer: Option A

Explanation:

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8. 

Which two values are plotted on a B-H curve graph?
A. Reluctance and flux density
B. Permeability and reluctance
C. Magnetizing force and permeability
D. Flux density and magnetizing force

Answer: Option D

Explanation:

No answer description available for this question

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