Electricity
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- 1.Concerning the flow of electricity, materials such as rubber, glass, and dry wood are known as
- A.
Conductors
- B.
Insulators
- C.
Thermocouples
- D.
D electric cells
- 2.Dry wood makes a good conductor.
- A.
True
- B.
False
- 3.A ______ is the fundamental unit of a battery.
- A.
Watt
- B.
Thermocouple
- C.
Cell
- D.
None of the above answers are correct.
- 4.Ohm's law maybe expressed as an equation I=E/R, where "E" represents:
- A.
Resistance in ohms.
- B.
Voltage in volts
- C.
Current in amperes.
- D.
None of the answers are correct.
- 5.Ohm's law may be expressed as an equation I=E/R, where "R" represents:
- A.
Resistance in ohms.
- B.
Voltage in volts.
- C.
Current in amperes.
- D.
None of the answers are correct.
- 6.When voltage is doubled, power is
- A.
Tripled
- B.
Halved
- C.
Doubled
- D.
Doubled twice
- 7.The study of electricity began with the ancient___________
- A.
Egyptians
- B.
Jews
- C.
Greeks
- D.
Europeans
- 8.Charged atoms are called_________
- A.
Ohms
- B.
Conductors
- C.
Photoelectrons
- D.
Ions
- 9.The flow of electrical energy through a conductor is called
- A.
an electric charge
- B.
Electric current, or electricity.
- C.
a negative charge.
- D.
a unit of conductance.
- 10.Material that permits the free movement of a large number of electrons, such as copper wire, is known as a good
- A.
Conductor of electricity.
- B.
Insulator of electricity.
- C.
Example of electrolytic action.
- D.
Electromotive force.
- 11.N order, the best conductors of electricity are
- A.
copper, aluminum, and silver wire.
- B.
aluminum, copper and silver wire.
- C.
Copper, silver, and aluminum wire.
- D.
Silver, copper, and aluminum wire.
- 12.Electromotive force may be produced by
- A.
Friction and pressure.
- B.
Heat and light
- C.
Chemical action and magnetism.
- D.
All of the answers are correct.
- 13.The true cause of electricity was found with the development of
- A.
Charged particles.
- B.
Atomic theory of matter.
- C.
Static electricity.
- D.
Protons
- 14.A substance that has few free electrons is called
- A.
Ionic.
- B.
An insulator.
- C.
A conductor.
- D.
Electron deficient
- 15.A common name for the voltage produced by rubbing two materials together is
- A.
Static electricity.
- B.
Friction.
- C.
Dynamic charge
- D.
Dry charge. Dry charge.
- 16.Wires in an electric circuit are designed to keep
- A.
electrical resistance high.
- B.
Electrical current low.
- C.
electrical resistance low.
- D.
Distance from source voltage to load as far as possible.
- 17.A significant feature of a battery composed of secondary cells such as an automobile battery is that it is
- A.
cheap.
- B.
Light
- C.
Rechargeable
- D.
None of the answers are correct.
- 18.The direction of electron movement in any conductor is
- A.
From negative potential to positive potential.
- B.
From positive potential to negative potential.
- C.
between like charges.
- D.
in orbit around their nuclei.
- 19.Which of the following kinds of waves can be felt by human beings?
- A.
Vibrations
- B.
Radio
- C.
Radar
- D.
Light
- 20.The ___________ is the length of a cycle expressed in distance units.
- A.
Frequency
- B.
Amplitude
- C.
Wave length
- D.
Cycle
- 21.The __________ is the number of cycles repeated during one second of time.
- A.
Frequency
- B.
Amplitude
- C.
Speed
- D.
Cycle
- 22.The __________ is the wave strength at particular points along the wave.
- A.
Frequency
- B.
Amplitude
- C.
Wave length
- D.
Cycle
- 23.________occurs when there is a change in the density or atmosphere in which the wave is
- A.
Trapping
- B.
Diffraction
- C.
Refraction
- D.
Reflection
- 24._________ causes the spreading of radio waves behind obstructions.
- A.
Trapping
- B.
Diffraction
- C.
Refraction
- D.
Reflection
- 25._________ causes the spreading of radio waves behind obstructions.
- A.
Trapping
- B.
Diffraction
- C.
Refraction
- D.
Reflection
- 26.______ occurs when a temperature inversion in the atmosphere holds cold air close to the Earth's surface.
- A.
Trapping
- B.
Diffraction
- C.
Refraction
- D.
Reflection
- 27.The following are all Navy radar general categories except:
- A.
Search
- B.
Rescue
- C.
Fire Control
- D.
Special
- 28.The information gathered by most shipboard radar is presented and analyzed in a shipboard space called the
- A.
Combat Information Center.
- B.
All Weather Decoding Center.
- C.
Radar Decoding Center.
- D.
Satellite Decoding Center.
- 29.Radar can be used to track both friendly and potentially threatening
- A.
satellites.
- B.
Aircraft
- C.
Ships
- D.
None of the answers above
- 30.Radio waves are ______ from the ionosphere, which is generally 30-250 miles above the Earth.
- A.
Deflected
- B.
Reflected
- C.
Diffracted
- D.
Trapped
- 31.What is the basic continuous wave of a modulated wave called?
- A.
Carrier Wave
- B.
Undercurrent wave
- C.
Sound waves
- D.
Radar wave
- 32.What is one complete sequence of the strength of a wave as it passes through a point in space?
- A.
Cycle
- B.
Wavelength
- C.
Frequency
- D.
Aptitude
- 33.Electronics is the basic study of _______________.
- A.
Electromagnetic waves
- B.
Space
- C.
Computer systems
- D.
circuitry
- 34.The term RADAR stands for __________________.
- A.
Radio detection and ranging
- B.
Radio
- C.
Radio ranging
- D.
Radio detection
- 35.Frequency modulation is abbreviated as _______________.
- A.
FM
- B.
FMOD
- C.
AM
- D.
FR
- 36.Amplitude modulation is abbreviated as __________
- A.
PM
- B.
AM
- C.
DW
- D.
FR
- 37._____________ uses highly sophisticated electronics to counter enemy electromagnetic waves.
- A.
Electronic Warfare
- B.
Anti Submarine Warfare
- C.
Electronics
- D.
Electricity
- 38.What type of waves can travel through a complete vacuum?
- A.
Sound
- B.
Vibrations
- C.
Water Waves
- D.
Electromagnetic Waves
- 39.What does every electronic device use for basic operation?
- A.
Mechanical waves
- B.
Electromagnetic waves
- C.
Radar Waves
- D.
Light waves
- 40.How is frequency (Hertz) abbreviated?
- A.
Ht
- B.
Hz
- C.
HR
- D.
HRZ
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