ASVAB Electronics Practice Test #3

Question 1 of 50

Electrical power can be calculated with the following formula: P = I x V What does the letter I represent in this formula?

watts
voltage
current
impedance

Question 2 of 50

What is the load in this basic circuit model?

A
B
C
D

Question 3 of 50

Three amps equals how many milliamps?

0.003
30
300
3,000

Question 4 of 50

What type of electrical circuit is depicted above?

simple circuit
series circuit
parallel circuit
series-parallel circuit

Question 5 of 50

What device would you use to measure electrical resistance in a circuit.

ohmmeter
voltmeter
ammeter
electricity meter

Question 6 of 50

Which of the following is NOT a type of resistor?

potentiometer
dielectric
rheostat
variable

Question 7 of 50

Which of these electrical devices can be used to store an electric charge?

Semiconductor
Diode
Capacitor
Transistor

Question 8 of 50

What does this symbol refer to?

piezo transducer
relay switch
zener diode
oscilloscope

Question 9 of 50

The amount of energy used by a consumer in their home or business is typically measured in

current
amps
voltage
kilowatt-hours

Question 10 of 50

AM radio stations broadcast in which frequency range?

530-1,700 kHz
7-1,002 MHz
1-40 GHz
60-1,000 AHz

Question 11 of 50

If a circuit has 8 volts of power and 4 ohms of resistance, what will the current equal?

1/2 amp
2 amps
4 amps
8 amps

Question 12 of 50

Which of the following is the correct definition of an electrical cell?

A method of grounding an electrical current to the ground.
A system of transporting current from one part of a component to another.
A device that is capable of changing some form of energy (such as chemical energy) into electricity.
An electrical device that can convert electric power into radio waves, and vice versa

Question 13 of 50

What is the voltage in a circuit with 10 amps of current and 6 ohms of resistance?

0.6
1.7
60
600

Question 14 of 50

The resistor color code for 2 is

Black
Brown
Red
Orange

Question 15 of 50

What type of switch is pictured above?

simple on/off
changeover
double pull double throw
push-to-break

Question 16 of 50

Which of the following is the SI unit representing one cycle per second?

Ohm
Frequency
Ampere
Hertz

Question 17 of 50

Which of the following is the most conductive element?

Gold
Silver
Aluminium
Copper

Question 18 of 50

Which of the following statements are correct regarding a Voltmeter?

A voltmeter is used to measure current.
A voltmeter is used in parallel to a circuit.
A voltmeter must have the least resistance.
All of the above

Question 19 of 50

Which of the following statements is incorrect regarding Ohm’s Law?

Voltage is directly proportional to the current.
Voltage is inversely proportional to the resistance.
Current is inversely proportional to the resistance.
Voltage is directly proportional to both current and resistance.

Question 20 of 50

If three different resistors are connected in parallel and a voltage is applied across them, which of the following statements is correct?

The smallest resistance has the least power loss across three resistances.
The greatest resistance has the maximum power loss across three resistances.
Both the smallest and the greatest resistances have the same power losses.
The greatest resistance has the least power loss across three resistances.

Question 21 of 50

A microwave is consuming 800 W power using a standard North American 120 V power supply. What is the approximate amount of current flowing?

3 amperes
5 amperes
7 amperes
9 amperes

Question 22 of 50

Which of the following is a unit of power?

J/s
W
V.A
All of the above

Question 23 of 50

Which of the following is true regarding an AC signal?

The greater the time period, the greater the frequency.
The smaller the time period, the greater the frequency.
The time period of an AC signal is directly proportional to the square of the frequency.
There is no relation between the frequency and time period of an AC signal.

Question 24 of 50

A capacitor blocks Direct Current (D.C). Hence, it is also known as a:

Blocking Capacitor
Switched Capacitor
Coupling Capacitor
Both Blocking and Coupling Capacitors

Question 25 of 50

How many valence electrons are present in most semi-conductor materials?

4
5
6
7

Question 26 of 50

Which of the following instruments is used to measure resistance of a load?

Voltmeter
Ohmmeter
Ammeter
Galvanometer

Question 27 of 50

How much current will flow through the resistor R2 if R1=R2=10 ohms and R3=20 Ohms?

1.5 amperes
3 amperes
4 amperes
6 amperes

Question 28 of 50

What does the following image represent?

Fixed Resistor
Rheostat
Capacitor
Potentiometer

Question 29 of 50

Four bulbs are connected in a series-parallel circuit as shown in the given figure. Each bulb is exhibiting a resistance of 4 ohms. If one of two bulbs in the parallel connection blows up, then what will the effect be on the total effective resistance offered by all the bulbs?

The total effective resistance will decrease.
The total effective resistance will increase.
The total effective resistance will remain same.
The circuit would be open.

Question 30 of 50

A ground is not one of the following.

A place with a maximum resistance.
A place of lowest potential in a circuit.
A reference point in the circuit from which voltages are measured.
A common return path for electric current.

Question 31 of 50

A circuit breaker is better than a fuse because

Circuit breakers are less expensive.
A circuit breaker responds more quickly to an excessive current than a fuse.
A circuit breaker can be reused multiple times.
A circuit breaker is often not compatible with modern electric equipment.

Question 32 of 50

Which of the following statements is correct?

Conventional current flows from positive terminal of the source to its negative terminal through the circuit.
Electron current flows from positive terminal of the source to its negative terminal through the circuit.
Conventional current flows from negative terminal of the source to its positive terminal through the circuit.
Both option A and B

Question 33 of 50

What is commonly used in a circuit in which the flow of electricity needs to pass easily in one direction but not the opposite direction?

Resistor
Diode
Capacitor
Inductor

Question 34 of 50

Which of the following is not an application of a transistor?

Electric Switch
Amplifier
Transformer
Current Regulator

Question 35 of 50

In a transformer

The primary coil is the one that is connected to the source.
The secondary coil is the one in which an electric current is induced.
A larger number of secondary coils means a larger voltage.
All of the above

Question 36 of 50

Which of the following statements is correct?

A generator converts mechanical energy into electrical energy.
A motor converts electrical energy into mechanical energy.
A motor converts mechanical energy into electrical energy.
Both options A and B

Question 37 of 50

Which of the following statements is correct?

Atomic Number is the number of electrons present in any material.
Atomic Number is the number of neutrons present in any material.
Atomic Number is the number of protons present in the nucleus of any material.
Atomic Number is the number of protons and electrons present in any material.

Question 38 of 50

What is the frequency of Direct Current (DC)?

0 Hz
50 Hz
60 Hz
100 Hz

Question 39 of 50

What does the following image represent?

Inductor
Transistor
Diode
Ground

Question 40 of 50

An ideal fuse should have a:

High melting point and a low current rating.
Low melting point and a high current rating.
High melting point and a high current rating.
Low melting point and a low current rating.

Question 41 of 50

A fuse rated at 0.8 A blows when the switch is closed. If an 80 V supply is supplying power to the circuit, what would be the maximum possible value of the resistance for which the current flows through the circuit?

100 ohms
90 ohms
80 ohms
70 ohms

Question 42 of 50

A capacitor stores energy in the form of:

Electric Field
Magnetic Field
Both Electric and Magnetic Fields
Neither Electric nor Magnetic Field

Question 43 of 50

What is the basic operation of a step-up transformer?

It steps up the voltage.
It steps down the current.
It steps up the current.
Both options 1 and 2

Question 44 of 50

The generated force on a current carrying wire can be increased by

Increasing the amount of current flowing.
Decreasing the length of the wire.
Decreasing the strength of the magnetic field.
All of the above

Question 45 of 50

A capacitor is also known as:

Inductor
Rectifier
Condenser
Switch

Question 46 of 50

Four capacitors are connected in parallel, each having a capacitance of 4 farads. What will be the equivalent capacitance of these capacitors?

4 F
16 F
2 F
1 F

Question 47 of 50

The electrical symbol in the figure represents which of the following?

Oscilloscope
Lamp (Lighting)
Galvanometer
Ammeter

Question 48 of 50

An inductor stores energy in the form of

Electrical field
Mechanical Energy
Magnetic field
Both electrical and magnetic fields.

Question 49 of 50

What does the following image represent?

Transistor
Diode
Heater
Transformer

Question 50 of 50

Which of the following statements is incorrect regarding a transformer?

The frequency does not change in transformation action.
A transformer has no mechanical losses.
Secondary current of a step-down transformer is less than its primary current.
The power on primary side of an ideal transformer is equal to the power on secondary side.

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