NCATT AET (Direct and Alternating
Current) Practice Exam Questions
and Answers
Proton - Answer-Positively charged subatomic particles that exist within the nucleus of
all atoms
Resistance - Answer-Electrical characteristic of a conductor; opposition to current;
measured in Ohms (Ω), represented by "R"
Scientific Notation - Answer-A mathematical method of writing numbers using powers of
ten
Static Electricity - Answer-Electrical charge that may be built up on a non-conductive
surface by friction
Volt (V) - Answer-Basic unit of electrical pressure
Watts (W) - Answer-Basic unit of power (voltage x current)
Working Voltage - Answer-Maximum amount of DC voltage that can be safely applied
across a capacitor
Alternating Current (AC) - Answer-Flow of electrons that continuously changes its value
in magnitude and periodically reverses direction (sine-wave); easier to produce in larger
quantities than DC
Apparent Power - Answer-Product of effective voltage and effective current; expressed
in Volt-Amps (VA) rather than Watts (W)
Capacitive Reactance (XC) - Answer-Opposition to current flow in a circuit; in AC
capacitance causes current to lead voltage in phase (ICE); values in Ohms (Ω)
Delta Wound - Answer-Windings arranged in the shape of a triangle
Effective Voltage - Answer-Amount of AC that produces the same amount of heat as a
corresponding value of DC; referred to as the RMS value; less than peak value of AC;
all values of AC are effective values
Frequency - Answer-Number of cycles of AC completed in one second; expressed in
Hertz (Hz);
Current) Practice Exam Questions
and Answers
Proton - Answer-Positively charged subatomic particles that exist within the nucleus of
all atoms
Resistance - Answer-Electrical characteristic of a conductor; opposition to current;
measured in Ohms (Ω), represented by "R"
Scientific Notation - Answer-A mathematical method of writing numbers using powers of
ten
Static Electricity - Answer-Electrical charge that may be built up on a non-conductive
surface by friction
Volt (V) - Answer-Basic unit of electrical pressure
Watts (W) - Answer-Basic unit of power (voltage x current)
Working Voltage - Answer-Maximum amount of DC voltage that can be safely applied
across a capacitor
Alternating Current (AC) - Answer-Flow of electrons that continuously changes its value
in magnitude and periodically reverses direction (sine-wave); easier to produce in larger
quantities than DC
Apparent Power - Answer-Product of effective voltage and effective current; expressed
in Volt-Amps (VA) rather than Watts (W)
Capacitive Reactance (XC) - Answer-Opposition to current flow in a circuit; in AC
capacitance causes current to lead voltage in phase (ICE); values in Ohms (Ω)
Delta Wound - Answer-Windings arranged in the shape of a triangle
Effective Voltage - Answer-Amount of AC that produces the same amount of heat as a
corresponding value of DC; referred to as the RMS value; less than peak value of AC;
all values of AC are effective values
Frequency - Answer-Number of cycles of AC completed in one second; expressed in
Hertz (Hz);
