By: hessy • 2 year ago
Some examples from this set of practice questions
1.
Define Magnetic flux
Answer: Magnetic flux linkage is the product of the number of turns on the coil and the flux through the coil (NФ).
2.
Define diode
Answer: A diode is a component that only allows current to flow in one direction.
3.
State Faraday’s law
Answer: Faraday’s law states that the emf induced is directly proportional to the rate of change of magnetic flux (flux linkage).
4.
State Lenz\'s law
Answer: Lenz\'s law states that the induced current flows in a direction so as to set up a magnetic field to oppose the change in magnetic flux
5.
Where does a magnetic field exists?
Answer: a magnetic field exists around a permanent magnet or a current-carrying conductor
6.
How is the direction of the magnetic field that exists around a straight current-carrying conductor determined?
Answer: the right hand wire rule
7.
A current carrying conductor placed in a magnetic field experiences a force. The direction of the force can be determined using ...
Answer: Flemming’s Left Hand Motor Rule.
8.
The magnitude of the force can be calculated using the following formula:
Answer:
9.
What is the energy conversion of a direct current motor?
Answer: An electric motor converts electrical energy to mechanical energy.
10.
On what principle does an electric motor operate?
Answer: An electric motor operates on the principle of the motor effect.
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