Electrical Final Exam – Latest Exam Prep
2025/2026 | Practice Questions & Study Guide
Which of the following is the most important advantage of AC power over DC power?
A. Easy to change the values of I and E
B. Easy to Generate
C. Saves weight
D. None of the Above - correct answerEasy to change the values of I and E
__________ is created by the AC generator.
A. rectifier
B. sine wave
C. peak-to-peak RMS
D. direct current - correct answerSine Wave
One half of a sine wave is called a ____________.
A. RMS wave
B. Period
C. Alternation
D. Cycle - correct answerAlternation
The measured value from the maximum positive to the maximum negative values of
voltage or current is called __________ values.
A. RMS
B. Peak-to-Peak
C. Period
D. Alternation
E. Cycle - correct answerPeak-to-Peak
AC Voltmeters measure in ________ values.
A. RMS
B. Peak-to-Peak
C. Average
D. Alternation Squared - correct answerRMS
___________ is the angular relationship between the peak values of I and E.
A. Phase
B. Peak-to-Peak
C. Average Cos. angle
D. Alternation Squared Phase - correct answerPhase
RMS values = _________ of the peak value.
,A. Right Most angle Squared
B. .707
C. Average Cos. angle
D. .632 - correct answer.707
If a circuit has a peak voltage of 310.2 vac, what is the RMS voltage?
A. 219 watts
B. 189 watts
C. 310 volts
D. 195 volts - correct answer219 watts (310x.707=219)
If an AC generator has 8 poles and the rotor turns at 1,800 RPM, what is the frequency
of AC produced in Hz.?
A. 219
B. 120
C. 310
D. 189 - correct answer120 (8/2x1800/60=120)
The useful Power generated in an AC circuit is called __________ Power.
A. True
B. Apparent
C. Factor
D. Cos. - correct answerTrue
True power is that produced by I and E which is _________ phase.
A. In
B. Out
C. None of the above - correct answerIn
The amount of I and E which are in phase is also called the:
A. True Power
B. Apparent Power
C. Power Factor
D. Cos. Factor - correct answerTrue Power
If the peak voltage is 110 vac, and the peak current is 13 amps, what is the Apparent
Power? (in volt-amps)
A. 1,430 va
B. 430 va
C. 51 va
D. none of the above - correct answerNone of the Above ((110x.707)x(13x.707))
If the RMS voltage is 220 vac, the RMS current is 3.5 amps, and the Phase Angle 54
degrees, what is the True Power (in watts to two decimal places)?
A. 900.73
B. 866.83
, C. 199.28
D. 317.68
E. 452.59 - correct answer452.59
What is the Phase Angle if the Power Factor is .9945?
A. 6 degrees
B. 12 degrees
C. 0 degrees
D. 3.56 degrees - correct answer6 degrees
The working voltage of a capacitor in an ac circuit should be:
A. .707 times the applied voltage
B. at least 50 % greater than the highest applied voltage
C. equal to the highest applied voltage - correct answerequal to the highest applied
voltage
The term that describes the combined resistive forces in an ac current is:
A. resistance
B. total resistance
C. impedance - correct answerimpedance
The basis for transformer operation in the use of alternating current is mutual ________.
A. inductance
B. capacitance
C. reactance - correct answerinductance
The opposition offered by a coil to the flow of alternating current is called (disregard
resistance):
A. impedance
B. reluctance
C. inductive reactance - correct answerinductive reactance
An increase in which of the following factors will cause an increase in the inductive
reactance of a circuit?
A. Inductance and frequency
B. Resistance and voltage
C. Resistance and capacitive reactance. - correct answerInductance and frequency
When different rated capacitors are connected in series in a circuit, the total
capacitance is?
a. Less than the capacitance of the lowest rated capacitor
b. Greater than the capacitance of the highest rated capacitor
c. Equal to the sum of all the capacitance - correct answera. Less than the capacitance
of the lowest rated capacitor
The amount of electricity a capacitor can store is directly proportional to the:
2025/2026 | Practice Questions & Study Guide
Which of the following is the most important advantage of AC power over DC power?
A. Easy to change the values of I and E
B. Easy to Generate
C. Saves weight
D. None of the Above - correct answerEasy to change the values of I and E
__________ is created by the AC generator.
A. rectifier
B. sine wave
C. peak-to-peak RMS
D. direct current - correct answerSine Wave
One half of a sine wave is called a ____________.
A. RMS wave
B. Period
C. Alternation
D. Cycle - correct answerAlternation
The measured value from the maximum positive to the maximum negative values of
voltage or current is called __________ values.
A. RMS
B. Peak-to-Peak
C. Period
D. Alternation
E. Cycle - correct answerPeak-to-Peak
AC Voltmeters measure in ________ values.
A. RMS
B. Peak-to-Peak
C. Average
D. Alternation Squared - correct answerRMS
___________ is the angular relationship between the peak values of I and E.
A. Phase
B. Peak-to-Peak
C. Average Cos. angle
D. Alternation Squared Phase - correct answerPhase
RMS values = _________ of the peak value.
,A. Right Most angle Squared
B. .707
C. Average Cos. angle
D. .632 - correct answer.707
If a circuit has a peak voltage of 310.2 vac, what is the RMS voltage?
A. 219 watts
B. 189 watts
C. 310 volts
D. 195 volts - correct answer219 watts (310x.707=219)
If an AC generator has 8 poles and the rotor turns at 1,800 RPM, what is the frequency
of AC produced in Hz.?
A. 219
B. 120
C. 310
D. 189 - correct answer120 (8/2x1800/60=120)
The useful Power generated in an AC circuit is called __________ Power.
A. True
B. Apparent
C. Factor
D. Cos. - correct answerTrue
True power is that produced by I and E which is _________ phase.
A. In
B. Out
C. None of the above - correct answerIn
The amount of I and E which are in phase is also called the:
A. True Power
B. Apparent Power
C. Power Factor
D. Cos. Factor - correct answerTrue Power
If the peak voltage is 110 vac, and the peak current is 13 amps, what is the Apparent
Power? (in volt-amps)
A. 1,430 va
B. 430 va
C. 51 va
D. none of the above - correct answerNone of the Above ((110x.707)x(13x.707))
If the RMS voltage is 220 vac, the RMS current is 3.5 amps, and the Phase Angle 54
degrees, what is the True Power (in watts to two decimal places)?
A. 900.73
B. 866.83
, C. 199.28
D. 317.68
E. 452.59 - correct answer452.59
What is the Phase Angle if the Power Factor is .9945?
A. 6 degrees
B. 12 degrees
C. 0 degrees
D. 3.56 degrees - correct answer6 degrees
The working voltage of a capacitor in an ac circuit should be:
A. .707 times the applied voltage
B. at least 50 % greater than the highest applied voltage
C. equal to the highest applied voltage - correct answerequal to the highest applied
voltage
The term that describes the combined resistive forces in an ac current is:
A. resistance
B. total resistance
C. impedance - correct answerimpedance
The basis for transformer operation in the use of alternating current is mutual ________.
A. inductance
B. capacitance
C. reactance - correct answerinductance
The opposition offered by a coil to the flow of alternating current is called (disregard
resistance):
A. impedance
B. reluctance
C. inductive reactance - correct answerinductive reactance
An increase in which of the following factors will cause an increase in the inductive
reactance of a circuit?
A. Inductance and frequency
B. Resistance and voltage
C. Resistance and capacitive reactance. - correct answerInductance and frequency
When different rated capacitors are connected in series in a circuit, the total
capacitance is?
a. Less than the capacitance of the lowest rated capacitor
b. Greater than the capacitance of the highest rated capacitor
c. Equal to the sum of all the capacitance - correct answera. Less than the capacitance
of the lowest rated capacitor
The amount of electricity a capacitor can store is directly proportional to the:
