NEW
Font size
WorksheetsSEEU1002_Etech_Quiz 4 (Ch4-Magnet)[2021-2]
Total questions: 10
Worksheet time: 8mins
Below are devices that are operated based on magnetism except ____________.
transformers
motors
loudspeakers
relays
combustion engines
_____________ is a natural magnet that was discovered centuries ago.
Lodestone
Tombstone
Neodymium
Lonestone
Bromium
The force of magnetism is referred to as
magnetic filed
electro-magnetic field
magneto
electric field
alternating current field
Magnetic flux is measured in ______.
Webers
Mark Weber
Tesla
Ampere-turn
Tesla-meter
A magnetic field also form around a conductor along which electric current is flowing. The field can be described using __________.
right hand screw rule
left hand screw rule
current divider rule
rule of law
rule of thumb law
Placing a ferrous material inside a coil carrying electric current ____________.
increases the magnetic field
increases the supply magnetomotive force
reduces the magnetic field
has no effect on the magnetic field
increases the relative permeability of the material
Reluctance of a magnetic material is _____________.
inversely proportional to the length of the material
directly proportional to the cross sectional area of the material
directly proportional to the current
inversely proportional to the permeability of the material
directly proportional to the relative permeability of the material
Fringing effect is ____________.
the bulging of the flux lines in the airgap
the bulging of the flux at the coil
the flux leakage at the airgap
the flux leakage at the coil
the characteristic of the flux lines that repel each other
Magnetomotive force per unit length is known as the ___________.
magnetizing force
mmf
flux density
magnetic flux
magnetic field density
When a conductor cuts or is cut by a magnetic flux ______________.
an electromotive force is generated in the conductor
a magnetomotive force is generated in the conductor
the reluctance of the magnetic material will reduce
the relative permeability of the conductor material will increase
nothing will happen to the electromotive force in the conductor
