ELECTRICAL PRACTICE EXAM
QUESTIONS AND ANSWERS (GRADED
A+)
An accidental path of low resistance, allowing passage of abnormal amount of current is
known as a/an ________. - ANSWER-Short Circuit.
Electric current is the flow of electrons through a conductor. The rate of this flow is
measured as _______. - ANSWER-Coulombs/second.
The unit of electrical resistance is the _______. - ANSWER-Ohm.
Electric motors intended for use outside the engine room and boiler room are frequently
rated to run at a designed ambient temperature of 40*C. What is the equivalent
temperature in degrees Fahrenheit? - ANSWER-104.0 *F
The sub-multiple prefix 'micro' (Greek letter 'mu') means _______. - ANSWER-Millionth
(10 to the -6th power)
Electrical power loss due to hysteresis is a result of _________. - ANSWER-Heat
generated by magnetic polarity reversals.
Alternating current circuits develop resistance, inductance and capacitance. The
inductance of a coil is expressed in _______. - ANSWER-Henrys.
The number of cycles per second occurring in AC voltage is known as the _________. -
ANSWER-Frequency.
The apparent power in a purely inductive circuit is also known as ________. -
ANSWER-Reactive Power.
The combined effect of inductive reactance, capacitive reactance, and resistance in an
AC series circuit is known as ________. - ANSWER-Impedance.
Capacitance is the property of an electric circuit opposing a change in the __________.
- ANSWER-Voltage in the circuit.
The electrical diagram shown in the illustration is used to depict a/an ___________.
Illustration EL-0015 - ANSWER-Capacitive circuit.
, Reversing the DC current flow through an electrical coil will __________. - ANSWER-
Reverse its two-pole field.
In the illustration, "D" is the symbol for a/an _________.
Illustration EL-0005 - ANSWER-Fuse.
Which of the listed electrical devices is represented by the symbol shown in the
illustration?
Illustration EL-0055 - ANSWER-Transformer.
The purpose of a magnetic relay is to __________. - ANSWER-Remotely open and
close contacts.
The existing resistance of a conductor is dependent upon its length, cross-sectional
area, ________. - ANSWER-Material and Temperature.
If a circuit has a resistance of 5, 10, and 20 ohms connected in parallel, what is the
combined resistance of the circuit? - ANSWER-2.9 ohms.
What is the current flow through R1 of the circuit illustrated if the resistance of R1 is 2
ohms, R2 is 3 ohms and R3 is 6 ohms with a 12 VDC battery?
Illustration EL-0021 - ANSWER-6 amps
What is the current flowing through R3 of the illustrated circuit if the battery is 12 VDC
and resistance of R1 is 2 ohms, R2 is 3 ohms, and R3 is 6 ohms?
Illustration EL-0021 - ANSWER-2 amps.
What is the current flowing through R1 of the illustrated circuit with a 6 VDC battery if
the resistance of R1 is 2 ohms, R2 is 4 ohms, and R3 is 4 ohms?
Illustration EL-0021 - ANSWER-3.0 amps.
Most conducting materials such as copper, aluminum, iron, nickel, and tungsten
___________. - ANSWER-Increase in resistance with increased temperature.
A conductor with a cross-sectional area of one circular mil would have a diameter of
_________. - ANSWER-0.001 inches.
A coil is wound with 200 feet of No. 16 tinned copper wire and connected to a 12 volt
battery. What is the current if the resistance per 1000 feet of No. 16 tinned wire is 4.26
ohms? - ANSWER-14.08 amps.
QUESTIONS AND ANSWERS (GRADED
A+)
An accidental path of low resistance, allowing passage of abnormal amount of current is
known as a/an ________. - ANSWER-Short Circuit.
Electric current is the flow of electrons through a conductor. The rate of this flow is
measured as _______. - ANSWER-Coulombs/second.
The unit of electrical resistance is the _______. - ANSWER-Ohm.
Electric motors intended for use outside the engine room and boiler room are frequently
rated to run at a designed ambient temperature of 40*C. What is the equivalent
temperature in degrees Fahrenheit? - ANSWER-104.0 *F
The sub-multiple prefix 'micro' (Greek letter 'mu') means _______. - ANSWER-Millionth
(10 to the -6th power)
Electrical power loss due to hysteresis is a result of _________. - ANSWER-Heat
generated by magnetic polarity reversals.
Alternating current circuits develop resistance, inductance and capacitance. The
inductance of a coil is expressed in _______. - ANSWER-Henrys.
The number of cycles per second occurring in AC voltage is known as the _________. -
ANSWER-Frequency.
The apparent power in a purely inductive circuit is also known as ________. -
ANSWER-Reactive Power.
The combined effect of inductive reactance, capacitive reactance, and resistance in an
AC series circuit is known as ________. - ANSWER-Impedance.
Capacitance is the property of an electric circuit opposing a change in the __________.
- ANSWER-Voltage in the circuit.
The electrical diagram shown in the illustration is used to depict a/an ___________.
Illustration EL-0015 - ANSWER-Capacitive circuit.
, Reversing the DC current flow through an electrical coil will __________. - ANSWER-
Reverse its two-pole field.
In the illustration, "D" is the symbol for a/an _________.
Illustration EL-0005 - ANSWER-Fuse.
Which of the listed electrical devices is represented by the symbol shown in the
illustration?
Illustration EL-0055 - ANSWER-Transformer.
The purpose of a magnetic relay is to __________. - ANSWER-Remotely open and
close contacts.
The existing resistance of a conductor is dependent upon its length, cross-sectional
area, ________. - ANSWER-Material and Temperature.
If a circuit has a resistance of 5, 10, and 20 ohms connected in parallel, what is the
combined resistance of the circuit? - ANSWER-2.9 ohms.
What is the current flow through R1 of the circuit illustrated if the resistance of R1 is 2
ohms, R2 is 3 ohms and R3 is 6 ohms with a 12 VDC battery?
Illustration EL-0021 - ANSWER-6 amps
What is the current flowing through R3 of the illustrated circuit if the battery is 12 VDC
and resistance of R1 is 2 ohms, R2 is 3 ohms, and R3 is 6 ohms?
Illustration EL-0021 - ANSWER-2 amps.
What is the current flowing through R1 of the illustrated circuit with a 6 VDC battery if
the resistance of R1 is 2 ohms, R2 is 4 ohms, and R3 is 4 ohms?
Illustration EL-0021 - ANSWER-3.0 amps.
Most conducting materials such as copper, aluminum, iron, nickel, and tungsten
___________. - ANSWER-Increase in resistance with increased temperature.
A conductor with a cross-sectional area of one circular mil would have a diameter of
_________. - ANSWER-0.001 inches.
A coil is wound with 200 feet of No. 16 tinned copper wire and connected to a 12 volt
battery. What is the current if the resistance per 1000 feet of No. 16 tinned wire is 4.26
ohms? - ANSWER-14.08 amps.
