Electronics Information(ASVAB)

Which device limits current flow to a single direction?

A- Capacitor

B-Transformer

C-Resistor

D-Diode

D-Diode

Semiconductors that convert electrical current into light are:

A- CFL

B-LED

C-Fluorescent

D-Incandescent

B-LED

When current flow is interrupted by a blown fuse, the circuit becomes?

A- Open

B-Closed

C-Parallel

D-Shorted

A- Open

Silicon chips are used primarily in

A- Relays

B-integrated circuits

C-motors

D-Transformers

B-Integrated circuits

A standard multimeter does NOT measure:

A- Voltage

B-Current

C-Frequency

D-resistance

C-Frequency

To make permanent electronic connections, use a:

A- Soldering iron

B-Multimeter

C-Splice Connector

D-Electrical Tape

A- Soldering iron

The part that revolves in the motor of a generator is called the:

A- Shaft

B-Brush Assembly

C-Armature

D-Bearing

C- Armature

In order to make an electric current flow, it is necessary to have:

A- Copper conductors

B-An ammeter

C-Difference of potential

D-Open circuit

C- Difference of potential

The symbol for a transformer

Transformer

Power lines carry what type of current:

A- Alternating

B-Direct

C-Transforming

D-Limited

A- Alternating Current

What does AC stand for

alternating current

What is the type of resistance in an AC transmitter circuit?

A- Static

B-Impedance

C-Frequency

D-Capacitance

B-Impedance

When wire conductors are coated with solder, the process is called?

A- Brazing

B-Merging

C-Fusing

D-Tinning

D-Tinning

Which of the following CANNOT be used to store an electrical charge:

A- Fuse

B-Dielectric

C-Capacitor

D-Battery

A-Fuse

When measuring resistance with an ohmmeter you should?

A- Connect the power

B-Insulate the probes

C-Disconnect the power

D-Measure polarity

C-Disconnect the power

Which of the following best carries electric current?

A- Transformer

B-Conductor

C-Switches

D-Resistor

B-Conductor

Which metal is commonly used as a conductor?

A- Aluminum

B-Copper

C-Chromium

D-Lead

B-copper

Which of the following converts light energy into electrical energy?

A- Radio

B-radar

C-stereo speaker

D-photoelectric cell

D-photoelectric cell

A neon bulb emits light because:

A- The current flows through neon gas

B-The glass is blue

C-The gas is blue

D-The filament in the bulb gets hot

A-The current flows through neon gas

Another name for a transistor is a:

A- Integrated circuit

B-Semiconductor

C-Transfer Resistor

D-Connector

B-Semiconductor

The property of a circuit that opposes the flow of electrons is :

A- Reactance

B-Capacitance

C-Resistance

D-Inductance

C-Resistance

What is an amplifier?

A- A device that makes audio signals stronger

B-A device that increases signal strength

C-A device that increases amperage.

D-A devices that improves sound fidelity

B-A device that increases signal strength

A current that changes its polarity many times per second is:

A- Direct

B-Reciprocating

C-Alternating

D-Transitory

C-Alternating

In what kind of circuit does electrical current flow from one component directly to the next component?

A- Open

B-Parallel

C-Series

D-Sequential

C-series

Which device lowers current flow in a circuit?

A- capacitor

B-Transformer

C-resistor

D-diode

c-resistor

A 220v circuit has a resistance of 10Ohms. How much current is present in the circuit?

A- 2 amps

B-20 amps

C-22 amps

D-40 amps

c-22

V = I * R

v= volt

I = current(amps)

R = Resistance(ohm's)

A 120V circuit has a resistance of 20ohms. How much current is present in the circuit?

A- .5amps

B-3 amps

C-6 amps

D-9 amps

c- 6 amps

v = I * R

If a series circuit has resistance of 22 ohms and a current of 5 amps, how much voltage is currently in the circuit?

A- 75V

B-100v

C-110v

D-220v

C-110

V = I * R

In this Schematic of a parallel circuit if R1 is 50 and R2 is 50, what is the total resistance?

A- 25ohms

B-50ohms

C-100 ohms

D-1,000ohms

A - 25 ohms

Rt= 1/1/r1+ 1/r2

In this schematic, the total resistance is ( r1 and r2 is 100)

A- 50ohms

B-100ohms

C-1,000ohms

D-10, 000ohms

A - 50

Which of the following allows the telecommunication industry to transmit the greatest volume of data at the fastest speed?

A- copper wire

B-Optical fiber

C-Wireless router

D-Aluminum wire

B-optical fiber

Picture of resistor

The phrase "open circuit" means:

A- Loose wires

B-Disconnected

C-Fully charged

D-Current can flow free

B-disconnected

In a closed circuit, when a short power cord is replaced with a long power cord, which of the following increases?

A- Voltage

B-Insulation

C-Resistance

D-Conductivity

C-resistance

A switch starts or stops the flow of electric current in a circuit by means of its:

A- Probes

B-Contacts

C-Resistors

D-Insulators

B-contacts

The multiple position on a wire stripper are required for:

A- various gauge wires

B-electrical code variations

C-people with different size hands

D-Different sizes of wire connectors

A- various gauge wires

Which part of a television is the output device?

A- Channel switch button

B-Volume control button

C-Antenna

D-Screen

D- screen

In the circuit shown in the illustration, the battery illuminates a lamp and sounds a horn. Opening switch 2 will:

A- Short out both the horn and the lamp

B-Activate the horn and turn off the lamp

C-Silence the horn and leave the lamp on

D-Alternate power between the lamp and the horn

C- silence the horn and leave the lamp on

When an outlet is grounded, it is connected to:

A- An appliance

B-A cold wire

C-A red wire

D-The earth

D- the earth

A computer's microprocessor is actually

A- A USB port

B-A serial port

C-A vacuum tube

D- An integrated circuit

D- An integrated circuit

Which of the following components is found in a simple electromagnet?

A- Coil of wire

B-transistor array

C-Fiber optic bundle

D-Bank of capacitors

A-coil of wire

Which of these is an example of an electrostatic discharge?

A- A lightning bolt strikes a tall building

B-A battery stops producing electricity

C-An outdoor porch light is turned off

D-A match is struck against a rock

A - A lightning bolt strikes a tall building

When someone says an appliance is "hard-wired" it usually means the appliance is:

A- Plugged into a four-plug outlet

B-Wired directly into the house wiring

C-Plugged into a ground-fault interrupter switch

D-Connected by a surge protector to the house wiring

B-wired directly into the house wiring

If the resistance is 100 ohms and the current is 0.1 amperes in this circuit diagram, the the voltage is:

A- 5v

B-10v

C-100v

D-1,000v

b-10v

What is the current in a series circuit which have 15ohms, 5 ohms and 20 ohms and the volt is 120v

A- 2amps

B-3 amps

C-4 amps

D-5 amps

B-3 amps

total resistance = 15 + 20 + 5= 40

then V = I * R

In this schematic of a parallel circuit , if r1 is 50 and r2 is 50, what is the total resistance?

A- 25ohms

B-50 ohms

C-100ohms

D-1,000ohms

A - 25ohms

What is the total resistance in this circuit series(85 and 175 ohms) and parallel 150 and 100 ohms and 80v?

A- 85ohms

B-510ohms

C-320ohms

D-260ohms

C- 320ohms

first calculate parallel circuit that's gonna be = 60 and then series circuit that's gonna be = 85 + 60 + 175 = 320

Which of the following equations is not an accurate representation of ohm's law?

A- V = I * R

B- I= V/R

C- R = V/I

D- I = V * R

D- I = V * R

Which of the following is the correct formula to determine electric power in watts?

A- P= I * V

B- P = 2I * V

C- P = 2V * I

D-p = 2I * V

A - P = I * V

To measure electrical power, you would use an:

A- ammeter(amp)

B-ohmmeter(resistance)

C- voltmeter(volts)

D- wattmeter

D- wattmeter

Which of the following has the least resistance?

A- iron

B-rubber

C-copper

D-wood

C-copper

If each resistor in this circuit equals 1,000 ohms, what is the total resistance in this circuit? (4 resistor)

A- 250ohms

B-500ohms

C-1,000ohms

D-4, 000ohms

A - 250 ohms use parallel formula

Changing AC to DC is called what?

A- capacitance

B-impedance

C-rectification

D-induction

C- rectification

A number -12 wire compared to a number 6 wire:

A- is longer

B- is shorter

C-is smaller in diameter

D- is larger in diameter

D- is smaller in diameter

If 2 volts of battery power is used to power a flashlight that draws 1 amp of current, how much power does the flashlight use?

A- .5W

B-2W

C-4W

D-16W

B- 2W

P = I * V

The symbol of fuse

How many paths of electrical flow can be found in a series circuit?

A- one

B-two

C-two or more

D-it can't be determined form the information given.

A - one

The ground wire is always :

A- green

B-black

C-whitish

D-blue

A - green

Silver is a better conductor than copper. But copper is more often used because of:

the cost of silver

If a circuit has a 9v battery and a 3ohms resistor, what is the power output of the battery?

A- 27w

B-243w

C-81w

D-6w

A - 27

To find the answer we have to use the P = I V but we need current so first we need to use ohms law v = I R

What is the total current in this circuit? it's series circuit and there two resistor 20 and 40 ohms and the volt is 60.

A- .5amps

B-1 amps

C-30amps

D-100amps

B - 1amps

find find the rt for series circuit that's rt= 20 + 40 = 60 then use ohms law V = I * R

Current can be expressed in

A- kiloohms

B-kilovolts

C-milliamperes

D-millivolts

c- milliamperes

Which of the following is one of the reasons neighborhoods are connected to the power grid via electrical substations instead of being wired into long-distance power lines directly?

A- The substation use special components to connect aluminum power line to copper household wiring.

B-the substation transformer direct current to alternating current for household use

C-the substation transformer alternating current to direct current for household use

D-The substation transforms the efficient high-voltage power coming off the lines to a safe, lower value for household use.

D-The substation transforms the efficient high-voltage power coming off the lines to a safe, lower value for household use.

When graphed over time, household alternating current (AC) takes on a distinct shape called a:

A- Sine wave

B-Pulse Wave

C-Sawtooth wave

D-Triangular wave

A- sine wave

Which of the following correctly list the subatomic particles in an atom?

A- Protons carry no charge in the nucleus, neutrons carry negative charge in the nucleus, and electrons surround the nucleus in a cloud and carry a positive charge.

B- Protons carry positive charge in the nucleus, neutrons have no charge in the nucleus, and electrons have a negative charge and are found in cloud surrounding the nucleus.

C-Protons carry positive charge in the nucleus, electrons have negative charge in the nucleus, and neutrons have a negative charge and cloud surround the nucleus in a cloud.

D-Protons carry positive charge, and they surround the nucleus in the cloud. The nucleus contains negatively charged electrons and neutrons, which carry no charge.

B- Protons carry positive charge in the nucleus, neutrons have no charge in the nucleus, and electrons have a negative charge and are found in cloud surrounding the nucleus.

What property of metals lends them to be conductive materials?

A-The protons in the outer shells are free to drift between atoms.

B-The electrons in the outer shells are free to drift between atoms.

C-The electrons in the outer shell are pulled in tightly by the nucleus so they do not drift away to surrounding atoms.

D-The neutrons in the outer shell are pulled in tightly by the nucleus so they do not drift away to surrounding atoms

B- The electrons in the outer shells are free to drift between atoms.

How many three-way switches would you use to control a hallway light from both ends of the hallway?

A-1

B-2

C-3

D-4

B-2

Which of these devices contains an electromagnet?

A-Light bulb

B-battery

C-Flashlight

D-Doorbell

A battery makes what kind of current?

A-indirect

B-Alternating

C-direct

D-pulsing

C-direct

Rapid and interrupted current that changes direction 60 times per second is known as:

A-direct current

B-nonconductor current

C-alternating current

D-erratic current

C-alternating current

In which kind of circuit is current always the same at all points?

A-parallel

B-Series

C-integrated

D-open

B-series

In a series circuit, a switch controls:

A-no devices on the circuit

B-one device on a circuit

C-two devices on a circuit

D-All devices on a circuit

D-All devices on a circuit

If 3 volts of battery power is used to power a flashlight that draws 5 amps of current, how much power does the flashlight use?

A-0.6w

B-1.67w

C-15w

D-75w

C-15

P = I * V

If a 30watt light bulb is operated at 120v, how much current does it draw?

A-0.25amps

B-2.5amps

C-25.0amps

D-3,600amps

A-0.25amps

If a computer uses 300w of power and operates for 10hours, how many kilowatt-hours of energy does it consume?

A-3kwh

B-30kwh

C-300kwh

D-0.3kwh

A-3khw

1000w-1khw

300*10=3000

3000/1000= 3khw

If an extension cord has a smaller gauge than is required by the appliance, it:

A-may heat up and cause a fire

B-will have no effect

C-shut itself off

D-not let the appliance turn on

A- may heat up and cause a fire

When an outlet draws more amps than it is rated to handle:

A-there is no risk of fire.

B-the outlet closes the circuit

C-the outlet turns off the power

D-The breaker for the circuit trips.

D- The breaker for the circuit trips

The capacity of a household electric circuit is commonly measured in units that describe its ability to deliver:

A-current

B-voltage

C-resistance

D-watts

A-current

A circuit breaker is a type of electrical:

A-ground

B-transformer

C-switch

D-resistor

C-switch

Ohm's law states that : V = I x R. If V stays the same, then an increase in R would cause I to:

A-increase

B-decrease

C-not change

D-not enough information

B-Decrease

The color stripes on a resistor indicate the resistor's :

A-volts

B-value

C-watts

D-current

B-Value

What tool is used to remove a module from an electronic assembly?

A-chip puller

B-wire gauge

C-wire stripper

D-hydrometer

A- chip puller

Home outlets are connected to a panel box with separate circuits. These outlets are connected in:

A-series

B-parallel

C-polarity

D-combination

B-parallel

A variable resistor is commonly used to:

A-Prevent a circuit overload.

B-Start an automobile engine.

C-Adjust the volume of a radio

D-Turn a heater to a specific

C- Adjust the volume of a radio

what are the different band color and digit on a resistor.

yellow - 4

blue - 6

gray - 8

white - 9