ATT Test 4 (Latest 2024/ 2025 Update) Questions and Verified Answers| 100% Correct| Grade A

ATT Test 4 (Latest 2024/ 2025 Update)
Questions and Verified Answers| 100%
Correct| Grade A
Q: Zt equals what at resonance?
Answer:
Rt
Q: What circuit value is at MINIMUM at resonance in parallel circuit?
Answer:
Current
Q: What is a resonant frequency?
Answer:
the frequency at which XL and XC are equal
Q: How many resonant frequencies does each circuit have?
Answer:
ONE! What you think you can have a bunch of wifes? You get one wife! This is the way the
world works!
Q: What circuit value is MAX at resonance in series circuit?

Answer:
Current
Q: What value is MINIMUM at resonance in parallel circuit?
Answer:
Impedance (Z)
Q: What effect does a changed value have in parallel LCR circuits?
Answer:
Branch current and It changes
Q: What effect do shorts have in parallel LCR circuits?
Answer:
It increases to MAX, Zt is reduced to 0 ohms
Q: What effect does a changed value have in series LCR circuits?
Answer:
It and Volt drops change
Q: What effect do shorts have in series LCR circuits?
Answer:
current/volt drops change, short reads 0V
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What happens if L1/C1 changes value in parallel/series resonance circuit? resonant frequency changesVr will not be min at correct frequency
What happens if there is a short in parallel resonance branch? Shorts entire circuitVr=Va at all frequencies
What happens if L1/C1 is open in parallel resonance circuit? Resonance isn’t a factorVr doesn’t fall to min at resonance
What happens if C1 is open (parallel resonance)? as frequency increases Vr will decrease because XL increases
What happens if L1 is open (parallel resonance)? as frequency increases Vr increases because XC decreases
What happens if L1 shorts (series resonance)? Vr will not decrease as frequency increases above resonant frequency
What happens if C1 shorts (series resonance)? Vr will not decrease as frequency decreases below resonant frequency
What circuit value is MAX at resonance in parallel circuit? Impedance (Z)
Zt equals what at resonance? Rt
What circuit value is at MINIMUM at resonance in parallel circuit? Current
What is a resonant frequency? the frequency at which XL and XC are equal
How many resonant frequencies does each circuit have? ONE! What you think you can have a bunch of wifes? You get one wife! This is the way the world works!
What circuit value is MAX at resonance in series circuit? Current
What value is MINIMUM at resonance in parallel circuit? Impedance (Z)
What effect does a changed value have in parallel LCR circuits? Branch current and It changes
What effect do shorts have in parallel LCR circuits? It increases to MAX, Zt is reduced to 0 ohms
What effect does a changed value have in series LCR circuits? It and Volt drops change
What effect do shorts have in series LCR circuits? current/volt drops change, short reads 0V
What is the phase difference between inductive and capacitive current? 180 (cancel each other out!)
What happens if resistor shorts in RC transient circuit? (what do waveforms look like) No signal across it (flatline), entire input dropped across C (unaltered signal), same as open Capacitor
What happens if resistor opens in RC transient circuit? (what do waveforms look like) Waveform across R is identical to input but AC
What happens if capacitor shorts in RC transient circuit? (what do waveforms look like) Input signal is measure across R1, no waveform on capacitor (flatline)
What happens if capacitor opens in RC transient circuit? (what do waveforms look like) Input dropped across capacitor (unaltered), no signal on resistor (flatline), same as short resistor
Low XC is associated with a long or short TC? Long
Is voltage small or large across a capacitor with low XC? Small
High XC is associated with a long or short TC? Short (because XC is small)
Is voltage small or large across a capacitor with high XC? Large (because XC is high)
What happens if TC is long or frequency is too high? capacitor doesn’t have time to fully charge or discharge, small current in opposite direction, Vc decrease
What happens if TC is short or frequency is too low? Capacitor fully charges before applied volts drop to ), long flat lines, Vc increase
When do RC transients occur? When volts across capacitor change
How many time constants are required for capacitor to exactly charge and discharge? 10
Current increases at rate of % per time constant What is the purpose of transformers? To transfer power What is the relationship between input and output power in a transformer? Power in always equals power out What principle do transformers operate on? Mutual inductance What is phase inversion in transformers? transformers reversing phase of applied AC voltage or sine wave (denoted by dots on schematic symbol) What are common transformer faults? Opens and shorts Transformers can have partial faults but not partial faults Partial shorts but not partial opens
What affect does an open in the primary coil have? No output voltage (no Ip means no mag field)Secondary would have 0V but ISN’T SHORT
What affect does an open in the secondary coil have? No secondary current, no output voltage, primary circuit is still complete
If a secondary opens in a multiple output transformer, how many secondary outputs are affected? Only the open
What affect do partial shorts have? Reduces number of turns in coil, changing the output voltage
What happens if there is a partial short in the primary? Output voltage INCREASES (like a step up)
What happens if there is a partial short in the secondary? Output voltage DECREASES (like step down)
What happens if there is a complete short in the primary? No output voltage, excessive current flow
What happens if there is a complete short in the secondary? No output voltage
What is the purpose of diodes? To allow current in ONLY ONE direction
What is a characteristic of rectifiers? Converts AC to pulsating DC
What direction does current flow in a diode? Cathode to Anode
The arrow in a diode represents what? Anode
The bar in a diode represents what? Cathode
Which side of a diode is P-type material? Anode
What side of a diode is N-type material? Cathode
Which part of the diode has free electrons? N-type (cathode)
Which part of the diode has holes? P-type
Which part of diode is doped with 5 electron atoms? N-Type (Cathode)
Which part of diode is doped with 3 electron atoms? P-type (Anode)
What happens to the depletion region when diode is forward biased? It becomes smaller allowing current to flow
What happens to the depletion region when diode is reverse biased? It becomes wider and prevents current flow
How do you connect a diode for forward biasing? Negative terminal to cathode, positive terminal to anode
When forward biased the diode acts as a closed switch (short)
When reverse biased the diode acts as a __ open switch
What is the required bias voltage for germanium diodes? 0.3 V
What is the required bias voltage for silicon diodes? 0.7 V
What voltage does the diode/resistor read when reverse biased? Diode- Applied voltageResistor-0 V
What voltage does the diode/resistor read when forward biased? Diode- 0 VResistor- Applied volts
What voltage will an OPEN diode read? Applied voltage (either reverse/forward biased)
What voltage will a SHORTED diode read? 0V across diode (either reverse/forward biased)
What will multimeter read when doing diode test on a SHORTED resistor? 0 in both forward/reverse bias