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ATT TEST 3 2025 (ACTUAL TEST) | ALL QUESTIONS
AND CORRECT ANSWERS | GRADED A+ | NEWEST
VERSION | VERIFIED ANSWERS | LATEST VERSION
What does a function generator do? ---------CORRECT ANSWER------------- ----Provides a known input signal so tech can test a circuit What does DC offset do? ---------CORRECT ANSWER-----------------Adds DC voltage to AC waveform What does the range control do (function generator)? ---------CORRECT ANSWER-----------------Sets coarse frequency What are four functions of frequency counter? ---------CORRECT ANSWER-----------------Frequency, period, totalize, check How is a magnetic field created? ---------CORRECT ANSWER----------------- current flowing through conductor What are inductors? ---------CORRECT ANSWER-----------------component with the ability to concentrate a magnetic field (opposes changes in DC current) What happens to current when a magnetic field expands? --------- CORRECT ANSWER-----------------Increases
Voltage induced in inductor is _____ to applied voltage and _____ current - --------CORRECT ANSWER-----------------Opposite/opposes What happens to induced voltage in an inductor with constant current? ----- ----CORRECT ANSWER-----------------No voltage is induced, must be increasing/decreasing What is real power? ---------CORRECT ANSWER-----------------power consumed by resistor (Pr = Vr x Ir) What is reactive power? ---------CORRECT ANSWER-----------------power in the inductor (PL = VL x IL) What is apparent power? ---------CORRECT ANSWER-----------------combo of real and reactive power (Pa = Va x It) What is the resistance of a good inductor? ---------CORRECT ANSWER----- ------------Low (20-200 ohms) In a RL series circuit, as phase angle approaches 0 degrees, the circuit is mostly (resistive/inductive) ---------CORRECT ANSWER----------------- Resistive
In a low pass filter, frequencies ABOVE cutoff frequency are known as what ---------CORRECT ANSWER-----------------Stop band frequencies In high pass filters, frequencies BELOW cutoff frequency are known as what? ---------CORRECT ANSWER-----------------Stop band frequencies What do capacitors do and what are they made of? ---------CORRECT ANSWER-----------------have the ability to store an electric charge, two plates separated by non-conducting dielectric How is a charged capacitor discharged? ---------CORRECT ANSWER-------- ---------through leakage or by applying a discharge circuit Three types of capacitors ---------CORRECT ANSWER-----------------Non- polarized, electrolytic, variable Electrolytic capacitors are _____ ---------CORRECT ANSWER----------------- polarized What is capacitance? ---------CORRECT ANSWER-----------------measure of capacitors ability to store an electrical charge What is capacitance measured in? ---------CORRECT ANSWER--------------- --Farad
What are three factors that affect capacitance ---------CORRECT ANSWER- ----------------distance between plates, plate size, dielectric material What is capacitive reactance (Xc)? ---------CORRECT ANSWER--------------- --Amount of opposition to current flow in circuit Current leads voltage by how many degrees in capacitive circuit? --------- CORRECT ANSWER----------------- 90 What does ICE stand for ---------CORRECT ANSWER-----------------Current leads voltage in a capacitive circuit Open in RL parallel branch reads how many volts? ---------CORRECT ANSWER-----------------Applied voltage What is the frequency of a wave? ---------CORRECT ANSWER----------------- number of cycles per second What is frequency measured in? ---------CORRECT ANSWER----------------- Hertz 3 cycles per second equals how many hertz? ---------CORRECT ANSWER- ----------------3 Hz
What is average voltage? ---------CORRECT ANSWER----------------- Calculated using sum of all angles contained in 180 degrees (0.637 X peak V) What is RMS voltage? ---------CORRECT ANSWER-----------------most common method to describe voltage of sine wave (0.707 X peak V) 120 VAC RMS = How much VDC? ---------CORRECT ANSWER--------------- --120 VDC What is phase angle? ---------CORRECT ANSWER-----------------amount by which waveforms lead or lag one another What phase angle has peaks of OPPOSITE POLARITY happening at the same time? ---------CORRECT ANSWER-----------------180 degrees What are harmonic frequencies? ---------CORRECT ANSWER----------------- echoes of the fundamental frequency, creates non-sinusoidal waves when combined with fundamental frequency How are harmonic frequencies calculated? ---------CORRECT ANSWER---- -------------determined by multiplying fundamental frequency by harmonic number What do oscilloscopes directly measure? ---------CORRECT ANSWER------- ----------Amplitude, period, waveshape
Most oscilloscopes directly measure what type of voltage? --------- CORRECT ANSWER-----------------Peak to peak Multimeters measure what type of voltage? ---------CORRECT ANSWER---- -------------RMS Bandwidth is the highest _____ an oscilloscope can measure? --------- CORRECT ANSWER-----------------Frequency What is the point of probe compensation? ---------CORRECT ANSWER------ -----------eliminates distortion of input signal What type of square wave should be produced when doing probe compensation? ---------CORRECT ANSWER-----------------5 VPP 1kHZ What happens when AC voltage is applied to inductor ---------CORRECT ANSWER-----------------current is constantly changing and inductor constantly opposes current What happens once max current is reached in inductor ---------CORRECT ANSWER-----------------inductor no longer opposes current and acts like a short
What is inductive reactance measured in? ---------CORRECT ANSWER-----
- -----------Ohms Voltage leads current by how many degrees in inductive circuit? --------- CORRECT ANSWER----------------- 90 What does ELI stand for? ---------CORRECT ANSWER-----------------Voltage leads current in inductive circuit What is impedance (Z) ---------CORRECT ANSWER-----------------combined opposition to current flow from resistor and inductor What replaces R in a RL circuit? ---------CORRECT ANSWER----------------- Z
