Electronics - Inductors

Exercise :: Inductors - General Questions

15. 

The polarity of induced voltage while a field is collapsing is:

A. independent of the force creating it
B. opposite to the force creating it
C. identical to the force creating the field
D. present only if the force is stationary

Answer: Option B

Explanation:

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16. 

What is the permeability of transformer iron?

A. 50
B. 450
C. 1,500
D. 5,500

Answer: Option D

Explanation:

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17. 

Electromagnetism is the:

A. magnetic field caused by a permanent magnet
B. action between a permanent and an artificial magnet
C. magnetic field action with a current-carrying wire
D. current in the coil

Answer: Option C

Explanation:

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18. 

A magnetic field has:

A. polar fields
B. lines of force
C. magnetomotive force
D. lines of reluctance

Answer: Option B

Explanation:

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19. 

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:

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20. 

What is the number of turns required in the secondary winding for a transformer when 120 volts is applied to a 2400-turn primary to produce 7.5 Vac at the secondary?

A. 75 turns
B. 150 turns
C. 900 turns
D. 1920 turns

Answer: Option B

Explanation:

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21. 

The four factors determining inductance are the number of turns, coil length, coil area, and:

A. permeability
B. reluctance
C. counter emf
D. coefficient of coupling

Answer: Option A

Explanation:

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