ATT Test 3 (Latest 2024/ 2025 Update) Questions and Verified Answers| 100% Correct| Grade A

ATT Test 3 (Latest 2024/ 2025 Update)
Questions and Verified Answers| 100%
Correct| Grade A
Q: What is peak voltage?
Answer:
highest positive or negative voltage obtained
Q: What is peak to peak voltage?
Answer:
determined by doubling peak voltage, from highest positive point to lowest negative point
Q: What is average voltage?
Answer:
Calculated using sum of all angles contained in 180 degrees (0.637 X peak V)
Q: What is RMS voltage?
Answer:
most common method to describe voltage of sine wave (0.707 X peak V)
Q: 120 VAC RMS = How much VDC?
Answer:

120 VDC
Q: What is phase angle?
Answer:
amount by which waveforms lead or lag one another
Q: What phase angle has peaks of OPPOSITE POLARITY happening at the same time?
Answer:
180 degrees
Q: What are harmonic frequencies?
Answer:
echoes of the fundamental frequency, creates non-sinusoidal waves when combined with
fundamental frequency
Q: How are harmonic frequencies calculated?
Answer:
determined by multiplying fundamental frequency by harmonic number
Q: What do oscilloscopes directly measure?
Answer:
Amplitude, period, waveshape
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What is the frequency of a wave? number of cycles per second
What is frequency measured in? Hertz
3 cycles per second equals how many hertz? 3 Hz
What is the period of a wave? Time per cycle
What is wavelength? the actual distance between beginning and end of one cycle (meters/centimeters)
What is induction? generation of AC current by changing a magnetic field (flux variation)
Flux variation is (directly/indirectly) proportional to induction and current? directly
What is needed to induce current? conductor, magnetic field, relative motion
What is peak voltage? highest positive or negative voltage obtained
What is peak to peak voltage? determined by doubling peak voltage, from highest positive point to lowest negative point
What is average voltage? Calculated using sum of all angles contained in 180 degrees (0.637 X peak V)
What is RMS voltage? most common method to describe voltage of sine wave (0.707 X peak V)
120 VAC RMS = How much VDC? 120 VDC
What is phase angle? amount by which waveforms lead or lag one another
What phase angle has peaks of OPPOSITE POLARITY happening at the same time? 180 degrees
What are harmonic frequencies? echoes of the fundamental frequency, creates non-sinusoidal waves when combined with fundamental frequency
How are harmonic frequencies calculated? determined by multiplying fundamental frequency by harmonic number
What do oscilloscopes directly measure? Amplitude, period, waveshape
Most oscilloscopes directly measure what type of voltage? Peak to peak
Multimeters measure what type of voltage? RMS
Bandwidth is the highest _ an oscilloscope can measure? Frequency What is the point of probe compensation? eliminates distortion of input signal What type of square wave should be produced when doing probe compensation? 5 VPP 1kHZ What does a function generator do? Provides a known input signal so tech can test a circuit What does DC offset do? Adds DC voltage to AC waveform What does the range control do (function generator)? Sets coarse frequency What are four functions of frequency counter? Frequency, period, totalize, check How is a magnetic field created? current flowing through conductor What are inductors? component with the ability to concentrate a magnetic field (opposes changes in DC current) What happens to current when a magnetic field expands? Increases Voltage induced in inductor is to applied voltage and current Opposite/opposes
What happens to induced voltage in an inductor with constant current? No voltage is induced, must be increasing/decreasing
What happens when AC voltage is applied to inductor current is constantly changing and inductor constantly opposes current
What happens once max current is reached in inductor inductor no longer opposes current and acts like a short
What are three types of inductors? air core, iron core, variable
What is inductance? “ability of a conductor to induce voltage when “”cut”” by magnetic flux”
What is the basic unit of inductance? Henry
What factors affect inductance? Number of turns, distance between windings, cross sectional area, permeability
More turns in inductor results in (higher/lower) inductance? higher
Shorter inductor equals (more/less) flux density? more
Higher cross sectional area of inductor equals (higher/lower) inductance? higher
What is inductive reactance? amount of opposition to current flow
What is inductive reactance measured in? Ohms
Voltage leads current by how many degrees in inductive circuit? 90
What does ELI stand for? Voltage leads current in inductive circuit
What is impedance (Z) combined opposition to current flow from resistor and inductor
What replaces R in a RL circuit? Z
What is real power? power consumed by resistor (Pr = Vr x Ir)
What is reactive power? power in the inductor (PL = VL x IL)
What is apparent power? combo of real and reactive power (Pa = Va x It)
What is the resistance of a good inductor? Low (20-200 ohms)
In a RL series circuit, as phase angle approaches 0 degrees, the circuit is mostly (resistive/inductive) Resistive
What two things are in phase across a resistor? current/voltage
What component is placed in series with input in a low pass RL filter? Inductor
The output is taken across what component in low pass RL filter? Resistor
In a low pass RL filter, as frequency increases output voltage (increases/decreases) Decreases
Cutoff frequency produces % of the max voltage? 70.7% (0.707)
What component is placed in series with input in a high pass RL filter? Resistor
Output voltage is taken across what component in a high pass RL filter? Inductor
When frequency increases in a high pass RL filter the output voltage (increases/decreases) Increases
In a low pass filter, frequencies ABOVE cutoff frequency are known as what Stop band frequencies
In high pass filters, frequencies BELOW cutoff frequency are known as what? Stop band frequencies
What do capacitors do and what are they made of? have the ability to store an electric charge, two plates separated by non-conducting dielectric
How is a charged capacitor discharged? through leakage or by applying a discharge circuit
Three types of capacitors Non-polarized, electrolytic, variable
Electrolytic capacitors are __ polarized
What is capacitance? measure of capacitors ability to store an electrical charge
What is capacitance measured in? Farad
What are three factors that affect capacitance distance between plates, plate size, dielectric material
What is capacitive reactance (Xc)? Amount of opposition to current flow in circuit
Current leads voltage by how many degrees in capacitive circuit? 90
What does ICE stand for Current leads voltage in a capacitive circuit
Open in RL parallel branch reads how many volts? Applied voltage