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CIE-1 Quiz 5

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1: Lodestone (magnetite) was probably created by

Volcanic eruptions from the earth's magnetic core
Solar irradiation of polarized steel
lunar pull and push on hematite
lightning strikes on iron ore

2: The first two civilizations that we believe used magnetism were the

French and Italians
Chinese and Greeks
Greeks and Romans
Italians and Germans

3: One of the first synthetic magnetic materials was

alnico
ferrite
samarium
neodymium

4: A supermagnet is made from

samarium and boron
neodymium, iron and boron
cobalt chrome steel
barium and iron oxide

5: The first person to note that a compass placed near a wire carrying electrical current was

Faraday
Ampere
Oersted
Henry

6: The person who made the first electric "motor" was

Faraday
Ampere
Oersted
Henry

7: Who found that magnets can produce electricity and vice versa

Faraday
Ampere
Oersted
Henry

8: Electromagnetic principles may be used to make

loudspeakers
relays
computer hard drives
all of the above

9: The principle of mutual induction (transformer action) was discovered by

Faraday
Henry
Faraday and Henry
Oersted

10: A transformer may be used to change one ________ voltage to an __________ voltage

AC, DC
AC, AC
DC, AC
DC, DC

11: What is so special about 6.3 and 12.6 volt filament transformers

easily shielded
safe voltage for experimenters
easy to wind
same as a car battery

12: The typical electrical generation plant puts out about

3 kV
30 kV
300 kV
30 volts

13: 70% of the elecrical power in the world is used

to power motors
in electrical lighting
to surf the internet
in domestic heating

14: The principle behind a DC motor is

magnetic conversion
converting DC to AC
repulsion and attraction
derision and revulsion

15: The basic principle of electrical power transmission is to send the power out with _______ voltage and ________ current

high, high
low, low
low, high
high, low

16: A pole pig is

a transformer used at a substation to drop long-range transmission voltage down to local transmission voltage
a transformer that converts local transmission voltage down to domestic voltage
the nickname for the circuit breakers in a power transmission system
a high powered constant current transformer

17: A reed switch

is a switch used to measure reeds very accurately
is a switch enclosed in a glass case with metal "reeds" activated by an iron nail
is a small glass enclosed switch with metal "reeds" activated by a magnet
is extremely rugged and built to take abuse

18: The north pole of a magnet

attracts the south needle of the compass
attracts the north needle of the compass
is always marked
cannot attract an iron bolt

19: Hot glue is

never used in electronic experimentation
cannot be used in electrical circuits because it is a conductor
widely used in electronic experimentation
harmless if you accidentally drip some on your skin

20: If properly wound, the electromagnet is about a _______ watt device

0.1
1
5
10

21: If the head of the electromagnet is "green" then the magnets on the armature should be

alternating green and white
both green
it doesn't make a difference
both white

22: The magnets on the armature should clear the bolt head by about

one thousandth of an inch
one hundredth of an inch
one tenth of an inch
one quarter of an inch

23: The motor will rotate somewhere around

30 rev/min
3 rev/sec
20 rev/sec
50 rev/sec

24: The speed of the motor may be measured with a(n)

oscilloscope
digital voltmeter
spectrum analyzer
time domain reflectometer

25: The LED Speed-O-Meter works on the same principle as

transformer mutual coupling
capacitor dielectric absorption
an automobile spark coil
a locked-rotor motor

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