Discussion
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- Question
What is the magnetomotive force in a 150-turn coil of wire with 2 A flowing through it?
Options- A. 13.33 mAt
- B. 300 At
- C. 75 At
- D. 152 At
- Correct Answer
- 300 At
- 1. Which electromagnetic device has a flexible cone?
Options- A. A speaker
- B. A dc generator
- C. A relay
- D. A solenoid Discuss
- 2. Which electromagnetic device has a movable iron core called a plunger?
Options- A. A speaker
- B. A dc generator
- C. A relay
- D. A solenoid Discuss
- 3. What are the effects of moving a closed wire loop through a magnetic field?
Options- A. A voltage is induced in the wire.
- B. A current is induced in the wire.
- C. The polarity across the wire depends on the direction of motion.
- D. All of the above Discuss
- 4. The Hall effect
Options- 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 Discuss
- 5. Which electromagnetic device uses brushes and a commutator?
Options- A. A speaker
- B. A dc generator
- C. A relay
- D. A solenoid Discuss
- 6. What do you call the characteristic of a magnetic material whereby a change in magnetization lags the application of a magnetizing force?
Options- A. Hysteresis
- B. Induction
- C. Retentivity
- D. Reluctance Discuss
- 7. The unit of flux density is known as
Options- A. magnetomotive force
- B. a weber
- C. a maxwell
- D. a tesla Discuss
- 8. Which two values are plotted on a B-H curve graph?
Options- A. Reluctance and flux density
- B. Permeability and reluctance
- C. Magnetizing force and permeability
- D. Flux density and magnetizing force Discuss
- 9. "Series" and "parallel" as applied to dc motors refer to
Options- 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 Discuss
- 10. Which electromagnetic device contains an armature?
Options- A. A speaker
- B. A dc generator
- C. A relay
- D. A solenoid Discuss
Magnetism and Electromagnetism problems
Search Results
Correct Answer: A speaker
Correct Answer: A solenoid
Correct Answer: All of the above
Correct Answer: is used in various sensor applications
Correct Answer: A dc generator
Correct Answer: Hysteresis
Correct Answer: a tesla
Correct Answer: Flux density and magnetizing force
Correct Answer: the connection of the field coil and armature windings
Correct Answer: A dc generator
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