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