Electrical Practice Exam
An accidental path of low resistance, allowing passage of abnormal amounts of current is known
as a/an ________. - ANS Short Circuit.
Electric current is the flow of electrons through a conductor. The rate of this flow is measured as
_______. - ANS Coulombs/second.
The unit of electrical resistance is the _______. - ANS 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? - ANS 104.0 *F
The sub-multiple prefix 'micro' (Greek letter 'mu') means _______. - ANS Millionth (10 to the
-6th power)
Electrical power loss due to hysteresis is a result of _________. - ANS Heat generated by
magnetic polarity reversals.
Alternating current circuits develop resistance, inductance and capacitance. The inductance of a
coil is expressed in _______. - ANS Henrys.
The number of cycles per second occurring in AC voltage is known as the _________. - ANS
Frequency.
The apparent power in a purely inductive circuit is also known as ________. - ANS Reactive
Power.
The combined effect of inductive reactance, capacitive reactance, and resistance in an AC
series circuit is known as ________. - ANS Impedance.
Capacitance is the property of an electric circuit opposing a change in the __________. - ANS
Voltage in the circuit.
The electrical diagram shown in the illustration is used to depict a/an ___________.
Illustration EL-0015 - ANS Capacitive circuit.
Reversing the DC current flow through an electrical coil will __________. - ANS Reverse its
two-pole field.
, In the illustration, "D" is the symbol for a/an _________.
Illustration EL-0005 - ANS Fuse.
Which of the listed electrical devices is represented by the symbol shown in the illustration?
Illustration EL-0055 - ANS Transformer.
The purpose of a magnetic relay is to __________. - ANS Remotely open and close contacts.
The existing resistance of a conductor is dependent upon its length, cross-sectional area,
________. - ANS Material and Temperature.
Most conducting materials such as copper, aluminum, iron, nickel, and tungsten ___________. -
ANS Increase in resistance with increased temperature.
A conductor with a cross-sectional area of one circular mil would have a diameter of
_________. - ANS 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? - ANS
14.08 amps.
When the current in a power transmission line is increased, the power loss _________. - ANS
Increases as the square of the current.
What would be the resistance value of the circuit if the current was .05 amps and the source
voltage was 25 volts?
Illustration EL-0018 - ANS 500 ohms.
For practical purposes, in a simple series circuit employing two resistors, the largest voltage
drop will occur across the resistor which has _______. - ANS The greatest resistance.
The total power consumed in a parallel circuit is ________. - ANS The sum of the powers used
in each individual load.
A lamp has a source voltage of 110 volts and a current of 0.9 amps. What is the resistance of
the lamp? - ANS 122.22 ohms
If a circuit has a resistance of 5, 10, and 20 ohms connected in parallel, what is the combined
resistance of the circuit? - ANS 2.9 ohms.
An accidental path of low resistance, allowing passage of abnormal amounts of current is known
as a/an ________. - ANS Short Circuit.
Electric current is the flow of electrons through a conductor. The rate of this flow is measured as
_______. - ANS Coulombs/second.
The unit of electrical resistance is the _______. - ANS 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? - ANS 104.0 *F
The sub-multiple prefix 'micro' (Greek letter 'mu') means _______. - ANS Millionth (10 to the
-6th power)
Electrical power loss due to hysteresis is a result of _________. - ANS Heat generated by
magnetic polarity reversals.
Alternating current circuits develop resistance, inductance and capacitance. The inductance of a
coil is expressed in _______. - ANS Henrys.
The number of cycles per second occurring in AC voltage is known as the _________. - ANS
Frequency.
The apparent power in a purely inductive circuit is also known as ________. - ANS Reactive
Power.
The combined effect of inductive reactance, capacitive reactance, and resistance in an AC
series circuit is known as ________. - ANS Impedance.
Capacitance is the property of an electric circuit opposing a change in the __________. - ANS
Voltage in the circuit.
The electrical diagram shown in the illustration is used to depict a/an ___________.
Illustration EL-0015 - ANS Capacitive circuit.
Reversing the DC current flow through an electrical coil will __________. - ANS Reverse its
two-pole field.
, In the illustration, "D" is the symbol for a/an _________.
Illustration EL-0005 - ANS Fuse.
Which of the listed electrical devices is represented by the symbol shown in the illustration?
Illustration EL-0055 - ANS Transformer.
The purpose of a magnetic relay is to __________. - ANS Remotely open and close contacts.
The existing resistance of a conductor is dependent upon its length, cross-sectional area,
________. - ANS Material and Temperature.
Most conducting materials such as copper, aluminum, iron, nickel, and tungsten ___________. -
ANS Increase in resistance with increased temperature.
A conductor with a cross-sectional area of one circular mil would have a diameter of
_________. - ANS 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? - ANS
14.08 amps.
When the current in a power transmission line is increased, the power loss _________. - ANS
Increases as the square of the current.
What would be the resistance value of the circuit if the current was .05 amps and the source
voltage was 25 volts?
Illustration EL-0018 - ANS 500 ohms.
For practical purposes, in a simple series circuit employing two resistors, the largest voltage
drop will occur across the resistor which has _______. - ANS The greatest resistance.
The total power consumed in a parallel circuit is ________. - ANS The sum of the powers used
in each individual load.
A lamp has a source voltage of 110 volts and a current of 0.9 amps. What is the resistance of
the lamp? - ANS 122.22 ohms
If a circuit has a resistance of 5, 10, and 20 ohms connected in parallel, what is the combined
resistance of the circuit? - ANS 2.9 ohms.
