ATT Test 3 Exam 2025 Questions and
Answers
What is the frequency of a wave? - ANS number of cycles per second
What is frequency measured in? - ANS Hertz
3 cycles per second equals how many hertz? - ANS 3 Hz
What is the period of a wave? - ANS Time per cycle
What is wavelength? - ANS the actual distance between beginning and end of one cycle
(meters/centimeters)
What is induction? - ANS generation of AC current by changing a magnetic field (flux
variation)
Flux variation is (directly/indirectly) proportional to induction and current? - ANS directly
What is needed to induce current? - ANS conductor, magnetic field, relative motion
What is peak voltage? - ANS highest positive or negative voltage obtained
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, What is peak to peak voltage? - ANS determined by doubling peak voltage, from highest
positive point to lowest negative point
What is average voltage? - ANS Calculated using sum of all angles contained in 180 degrees
(0.637 X peak V)
What is RMS voltage? - ANS most common method to describe voltage of sine wave (0.707 X
peak V)
120 VAC RMS = How much VDC? - ANS 120 VDC
What is phase angle? - ANS amount by which waveforms lead or lag one another
What phase angle has peaks of OPPOSITE POLARITY happening at the same time? - ANS 180
degrees
What are harmonic frequencies? - ANS echoes of the fundamental frequency, creates non-
sinusoidal waves when combined with fundamental frequency
How are harmonic frequencies calculated? - ANS determined by multiplying fundamental
frequency by harmonic number
What do oscilloscopes directly measure? - ANS Amplitude, period, waveshape
Most oscilloscopes directly measure what type of voltage? - ANS Peak to peak
Multimeters measure what type of voltage? - ANS RMS
Pg. 2 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED.
Answers
What is the frequency of a wave? - ANS number of cycles per second
What is frequency measured in? - ANS Hertz
3 cycles per second equals how many hertz? - ANS 3 Hz
What is the period of a wave? - ANS Time per cycle
What is wavelength? - ANS the actual distance between beginning and end of one cycle
(meters/centimeters)
What is induction? - ANS generation of AC current by changing a magnetic field (flux
variation)
Flux variation is (directly/indirectly) proportional to induction and current? - ANS directly
What is needed to induce current? - ANS conductor, magnetic field, relative motion
What is peak voltage? - ANS highest positive or negative voltage obtained
Pg. 1 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED.
, What is peak to peak voltage? - ANS determined by doubling peak voltage, from highest
positive point to lowest negative point
What is average voltage? - ANS Calculated using sum of all angles contained in 180 degrees
(0.637 X peak V)
What is RMS voltage? - ANS most common method to describe voltage of sine wave (0.707 X
peak V)
120 VAC RMS = How much VDC? - ANS 120 VDC
What is phase angle? - ANS amount by which waveforms lead or lag one another
What phase angle has peaks of OPPOSITE POLARITY happening at the same time? - ANS 180
degrees
What are harmonic frequencies? - ANS echoes of the fundamental frequency, creates non-
sinusoidal waves when combined with fundamental frequency
How are harmonic frequencies calculated? - ANS determined by multiplying fundamental
frequency by harmonic number
What do oscilloscopes directly measure? - ANS Amplitude, period, waveshape
Most oscilloscopes directly measure what type of voltage? - ANS Peak to peak
Multimeters measure what type of voltage? - ANS RMS
Pg. 2 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED.
