Electronics-Inductors Question and Answer
Electronics-Inductors Question and Answer
1. The electrical energy consumed by a coil is stored in the form of:
- an electrical field
- a force field
- an electrostatic field
- a magnetic field
2. What is magnetic flux?
- the number of lines of force in webers
- the number of lines of force in maxwells
- the number of lines of force in teslas
- the number of lines of force in flux density
3. As current travels within a conductor:
- the magnetic field aids the current
- a magnetic field is developed around it
- the wire tries to point north
- an electrostatic field opposes the current
4. What type of device consists of a coil with a moveable iron core?
- solenoid
- reed switch
- relay
- armature
5. What is hysteresis?
- lead between cause and effect
- lag between cause and effect
- lead between voltage and current
- lag between voltage and current
6. In a purely inductive circuit,
- current leads voltage by 90°
- voltage lags current by 90°
- voltage leads current by 90°
- voltage and current are in phase (0°)
7. A series RL filter circuit with an output across the inductor will result in what type of filtering?
- passing of the higher frequencies
- passing of the lower frequencies
- blocking of the higher frequencies
- blocking of a certain range of frequencies
8. On a schematic, dashed lines between two vertical coils usually mean the transformer has:
- an air core
- an iron core
- a nonmetallic core
- a ferrite core
9. Faraday's law states that the:
- direction of the induced voltage produces an opposition
- direction of an induced current produces an aiding effect
- emf depends on the rate of cutting flux
- emf is related to the direction of the current
10. A henry value divided by a circuit resistive value provides the:
- counter emf value
- induced voltage amplitude
- rise or decay time constant
- quality factor of the coil