Electrical Engineering - Magnetism and Electromagnetism

Exercise :: Magnetism and Electromagnetism - General Questions

11. 

There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb?

A. 14,400 At/Wb
B. 1,440 At/Wb
C. 9,000 At/Wb
D. 90,000 At/Wb

Answer: Option D

Explanation:

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12. 

A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

A. 90
B. 180
C. 270
D. 360

Answer: Option B

Explanation:

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13. 

What is the flux density in a magnetic field in which the flux in 0.1 m2 is 600 Wb?

A. 6,000 T
B. 600 T
C. 600 T
D. 6 T

Answer: Option A

Explanation:

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14. 

The unit for permeability is

A. Wb/At × m
B. At/m
C. At/Wb
D. Wb

Answer: Option A

Explanation:

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15. 

What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

A. 18.75 At
B. 30 At
C. 300 At
D. 187 At

Answer: Option C

Explanation:

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