ASVAB Electronics Information Solved MCQs

 

Electronics Information

Voltage can also be expressed as

(A) watts.

(B) amps.

(C) current.

(D) electrical potential difference. ✔

Newer cell phones contain a removable memory card, which is often called a

(A) SIM card✔

(B) DIM chip.

(C) PIN card

(D) PIN chip.

Made from a variety of materials, such as carbon, this inhibits the flow of current.

(A) resistor✔

(B) diode

(C) transformer

(D) generator

Ohm’s law states

(A) Voltage = Current × Resistance✔

(B) Amperes = Current × Resistance

(C) Voltage = Resistance ÷ Amperes

(D) Ohms = Current ÷ Voltage

A resistor’s first three color bands are brown, black, and red What is its value?

(A) 1,000 ohms✔

(B) 500 ohms

(C) 500 volts

(D) 50 volts

Two like poles of a magnet _________

(A) Attract each other

(B) Repel each other✔

(C) Create electricity

(D) Store electricity

A kilowatt-hour represents ______ watts

(A) 100

(B) 1,000✔

(C) 10,000

(D) 10

Which electronic component is rated in millihenries (mH)?

(A) Capacitor

(B) Resistor

(C) Inductor✔

(D) Transformer

One hertz is defined as

(A) one ampere per second

(B) one cycle per second✔

(C) one volt per second

(D) one coulomb per second

One advantage of alternating current is that it is easy to

(A) store.

(B) convert into chemical energy.

(C) transport through wire. ✔

(D) transmit through air.

In the U.S., all metal equipment, electrical or not, connected to a swimming pool must be

(A) freestanding.

(B) bonded together. ✔

(C) certified

(D) none of the above

This is a type of semiconductor that only allows current to flow in one direction. It is usually used to rectify AC signals (conversion to DC).

(A) capacitor

(B) inductor

(C) diode✔

(D) transformer

Radar can operate at frequencies as high as

(A) 100,000 Hz.

(B) 100,000 kHz.

(C) 100,000 MHz. ✔

(D) 500,000 MHz.

In North America, AC is always delivered at ____

(A) 60 Hz✔

(B) 50 Hz

(C) 220 Hz

(D) 110 Hz

What factor does NOT relate to the flow of electricity?

(A) Pressure

(B) Current

(C) Transferrance✔

(D) Resistance

An electrical circuit with only one path for current to flow is known as a ___________ circuit

(A) series✔

(B) parallel

(C) tri-pole

(D) bi-pole

The symbol below represents a _________

(A) Diode

(B) Battery

(C) Resistor

(D) Transformer✔

What do AC and DC stand for in the electrical field?

(A) amplified capacity and differential capacity

(B) alternating current and direct current✔

(C) accelerated climate and deduced climate

(D) none of the above

Changing AC to DC is called what?

(A) capacitance.

(B) impedance.

(C) rectification. ✔

(D) induction.

A 5,000 BTU air conditioner can efficiently cool up to 150 square feet, or a 10-foot x 15-foot room. What does BTU stand for?

(A) basic thermal unit

(B) basic temperature unit

(C) British thermal unit✔

(D) none of the above

Which is the most correct definition of current?

(A) the measure of electrical pressure

(B) the amount of electricity used in a heater

(C) the electricity used in heating a kilo of water

(D) the presence of electron flow✔

A device that transforms energy from one form to another is called

(A) a capacitor.

(B) a transducer. ✔

(C) a transformer.

(D) magic

Hertz (Hz) indicates _________?

(A) Amperage

(B) Frequency✔

(C) Power

(D) Power & Distance

Anode and Cathode are part of a _________?

(A) Resistor

(B) Capacitor

(C) Diode✔

(D) None of the above

Semiconductors are most commonly made of _____________?

(A) Silicon

(B) Plastic

(C) Germanium

(D) Both A & C are correct✔

Which of the following is NOT a type of transistor?

(A) NPN

(B) PNP

(C) PCP✔

(D) None of the above

Which one of the following is an active element?

(A) 15 kΩ resistor

(B) 10 mH inductor

(C) 25 pF capacitor

(D) 10 V power supply✔

A light bulb is 60 watts. Operated at 120 volts, how much current does it draw?

(A) 0.5 amperes✔

(B) 5.0 amperes

(C) 50.0 amperes

(D) 7,200 amperes

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

A fuse with a higher-than-required rating used in an electrical circuit

(A) improves safety.

(B) increases maintenance.

(C) may not work properly. ✔

(D) is less expensive.

Neutral wire is always

(A) whitish or natural. ✔

(B) black.

(C) green with stripes

(D) blue.

To measure electrical power, you would use a(n)

(A) ammeter.

(B) ohmmeter.

(C) voltmeter.

(D) wattmeter. ✔

What will happen if you operate an incandescent light bulb at less than its rated voltage?

(A) The bulb will burn brighter and last longer.

(B) The bulb will burn dimmer and last longer. ✔

(C) The bulb will burn brighter but won’t last as long.

(D) The bulb will burn dimmer but won’t last as long

An ohm meter measures _________

(A) Current

(B) Resistance✔

(C) Capacitance

(D) Pressure

The typical house runs on __________

(A) Direct Current

(B) Direct Frequency

(C) Alternating Current✔

(D) Alternating Frequency

I = V x R is ___________

(A) Ohm’s Law✔

(B) Behr’s Law

(C) Power’s Law

(D) None of the Above

Electric current can travel only through a

(A) wire.

(B) circuit. ✔

(C) battery.

(D) load

Copper is used in most electric wires because it is

(A) a semiconductor.

(B) not likely to heat up during normal usage.

(C) a good resistor and inexpensive.

(D) a good conductor and inexpensive. ✔

Amperes are a measure of

(A) the number of electrons moving through a conductor✔

(B) electrical pressure.

(C) a material’s ability to store electric current.

(D) the total resistance of a series circuit.

Ohms are a measure of

(A) capacitance.

(B) resistance. ✔

(C) current.

(D) cycles per second

If amperes = volts/ohms, then volts =

(A) 1/(amperes × ohms).

(B) ohms/amperes.

(C) amperes/ohms.

(D) amperes × ohms✔

A circuit with 20 amperes has a load of 12 ohms. What is the voltage?

(A) 60

(B) 120

(C) 240✔

(D) 24

If the resistance of a circuit is 0, the circuit is

(A) an open circuit.

(B) a short circuit. ✔

(C) a superconductor circuit.

(D) a semiconductor circuit.

If a transformer raises the voltage, it will

(A) raise the resistance.

(B) reduce the resistance.

(C) raise the amperage.

(D) reduce the amperage. ✔

Which of these devices depends on the close relationship between electricity and magnetism?

(A) Transformer

(B) Electromagnet

(C) Electric motor

(D) All of the above✔

If you are soldering two wires, you need solder,

(A) heat, and flux. ✔

(B) and heat.

(C) and flux.

(D) flux, and electrical tape.

 When connecting wires in the house, the bare copper wire is sometimes replaced by the

(A) the black wire.

(B) the white wire.

(C) the hot wire.

(D) conduit. ✔

To hook up an electric heater, you need

(A) three supply wires.

(B) four supply wires.

(C) heavy supply wires. ✔

(D) no supply wires.

At 120 volts, a 15-ampere circuit will carry _______ power than a 20-ampere circuit.

(A) more

(B) less✔

(C) first less, then more

(D) first more, then less

To connect a battery properly, you must

(A) observe proper polarity.

(B) get the right voltage.

(C) both A and B✔

(D) be certain the battery is chemical-free.

When you are making an electrical connection to a large battery,

(A) never tighten the terminal.

(B) tighten the terminal, then back off one turn.

(C) use salt water to prevent corrosion.

(D) tighten the terminal securely. ✔

If you need to reduce the voltage in a certain part of a circuit, you could use a

(A) capacitor.

(B) transistor.

(C) resistor. ✔

(D) inductor.

The number of times current changes direction per second is known as _______

(A) frequency✔

(B) resistance

(C) capacitance

(D) voltage

Which electronic component is rated in microfarads?

(A) Capacitor✔

(B) Resistor

(C) Inductor

(D) Transformer

Which of the following is NOT part of a diode?

(A) Emitter

(B) Base

(C) Collector

(D) Ground✔

The symbol below represents _________

(A) Ground✔

(B) Capacitor

(C) Transistor

(D) Battery

A rectifier ____________

(A) Amplifies current

(B) Reduces current

(C) Changes AC to DC✔

(D) Stores electricity

The most common type of circuit in a house is______________

(A) series

(B) parallel

(C) series-parallel✔

(D) dynamic

In most home wiring, the hot wire is

(A) black. ✔

(B) blue.

(C) green.

(D) white.

To control a light from each end of a hallway, you would install

(A) two single-pole switches.

(B) one four-way switch.

(C) one three-way switch.

(D) two three-way switches. ✔