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Unit 4 Review
Test Description: Unit 4
Instructions: Answer all questions to get your test result.
1) What are the 2 different parts of a magnet called?
A
North and South
B
Plus and Minus
C
North and South Pole
D
Positve and negative
2) Magnet materials are known as:
A
Electromagnetic materials
B
Ferrous materials
C
Solid materials
D
Heavy materials
3) The lines around a magnet that represent the magnetic field are known as:
A
Field Lines
B
Flux lines
C
Core lines
D
Magnetic lines
4) What happens to iron and steel when placed near a magnet?
A
They turn into a magnet
B
They repel the magnet
C
They rust
D
They become very hot
5) What happens when a magnet moves around copper?
A
The magnet heats up
B
The copper becomes magnetic
C
Nothing
D
The copper heats up
6) What happens when current flows through a wire?
A
A powerful magnetic field is created around the wire.
B
Nothing changes
C
The power supply become magnetic
D
A weak magnetic field is created around the wire.
7) When 2 or more magnets are placed beside each other, what happens to the magnetic field?
A
It decreases and changes shape
B
It increases and changes shape
C
It increases and stays the same shape
D
It decreases and stays the same shape
8) If current flows through wire wrapped in a coil, the magnetic field:
A
Stops
B
Becomes weaker
C
Becomes more powerful
D
Stays the same
9) The right hand rule states that:
A
Current stops flowing
B
Current flows both ways
C
Current flows in the opposite direction of your thumb
D
Current flows in the direction of your thumb
10) what would happened if you put an iron core in the middle of a coil?
A
The magnet field would increase
B
Nothing
C
The coil would become very hot
D
The magnetic field would decrease
11) What does DC stand for in DC motor?
A
Diode Circuit
B
Direct Current
C
Direct Coil
D
Distant Current
12) When current flow stops, what happens to the magnetic field?
A
It keeps expanding
B
It stays the same
C
It doubles
D
It starts to collapse
13) What does a Inductor do?
A
Permanently stores energy in the form of a magnetic field.
B
It's a material that does not allow current to flow
C
Occasionally produces a voltage.
D
Temporarily stores energy in the form of a magnetic field.
14) What device converts mechanical energy to electrical?
A
Capacitor
B
DC Motor
C
AC Motor
D
Generator
15) Which of these is not part of a DC motor?
A
Armature
B
Commutator
C
Brushes
D
Thermistor
16) What does a transformer do?
A
Makes voltage lower for long distance transmission
B
Make voltage higher for long distance transmission
C
Changes resistance in a circuit
D
Transforms current in a DC circuit
17) In long distance AC power transmission, where is power lost?
A
When converting back to DC
B
Through time to get to source
C
Through distance travelled
D
In sending the power
18) What is frequency measured in?
A
Watts
B
Hertz
C
Farads
D
Amps
19) Which of these is not part of a transformer?
A
Capacitor
B
Core
C
Primary winding
D
Secondary winding
20) What does an inverter do?
A
Changes voltage
B
Changes resistance
C
Changes DC to AC
D
Changes AC to DC
*select an answer for all questions
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