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- 1. Multiple Choice
Which rule can be used to work out which way a coil of wire rotates in a motor?
Fleming's left-hand rule
Fleming's right-hand rule
- 2. Multiple Choice
Give two ways you can reverse the direction of a basic dc motor?
Reverse the current
Keep the current the same
Reverse the magnetic field
Keep the magnetic field the same
- 3. Multiple Choice
How does a split ring commutator work?
Swaps the contact evert full turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil do not experience a force in the same direction.
Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
- 4. Multiple Choice
Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?
Gravity
Magnetic flux density/size of magnetic field
Size of the current
Length of the conductor
- 5. Multiple Choice
Which part (s) of the DC motor connect the power supply to the split-ring and coil?
Carbon brushes
Magnets
Commutator
Slip rings
- 6. Multiple Choice
The motion in DC motor can be increased by the following factors... (you may choose more than one)
Using a stronger magnet
Increasing the potential difference
Increasing the current
Increasing the number of turns on the coil
- 7. Multiple Choice
The operation of Commutator in DC Motor is
to convert dc to ac
to convert ac to dc
to convert fixed dc to variable dc
- 8. Multiple Choice
What it is?
Armature
Commutator
Brush
Magnet
- 9. Multiple Choice
What does the Thumb indicates?
current direction
motion of conductor
direction of Field flux
- 10. Multiple ChoiceA wire hangs between the poles of a magnet.
When there is a current in the wire, in which direction does the wire move?ABCD - Answer choicesTagsAnswer choicesTags