ATT Week 5 Comprehensive
Questions (Frequently Most
Tested) with Verified Answers
Limiting action happens in series when a diode is________ and in parallel when a diode is________. -
Answer: Reverse biased, forward biased.
What is the purpose of a diode limiting circuit? - Answer: To limit amplitude of the input.
What do clampers do? - Answer: Add DC to AC signal.
A transistor in a Common Emitter transfers an internal resistance from a low resistance in emitter base
to? - Answer: High resistance in collector base.
Ie (Emitter current) = ? - Answer: Ib (base current) + Ic (collector current)
When does cutoff occur in a Common Emitter? - Answer: When Emitter PN junction is reversed.
A Common Emitter has a gain of how much? - Answer: 10
How does a Common Emitter affect the phase of an input signal? - Answer: It inverts the input 180° (flip)
A Common Collector has a gain of how much? - Answer: 1 (no phase inversion)
A Common Base has a gain of how much? - Answer: 10 (no phase inversion)
How do transistor amplifiers operate? - Answer: By an AC input signal changing base bias.
, The component that develops bias for a transistor part is directly connected to the_________. - Answer:
Corresponding transistor part.
In a Common Emitter, if base voltage (base bias) increases, emitter current does what? - Answer:
Increases.
A small input controls a__________. - Answer: Large output
What is the most common type of Multi-stage Amplifier? - Answer: RC (Resistive-capacitive)
What is the purpose of Cascade amplifiers? - Answer: To increase Av (Voltage Gain)
How is AvT (Total voltage gain) calculated in a Cascade Amplifier? - Answer: The product of individual
stage gains (Q1xQ2xQ3x...=AvT)
What is the typical gain for a three stage cascade amplifier (assumed value)? - Answer: 1,000
What is Cascading? - Answer: The connecting of multiple amplifiers in series.
What is step 1 of the Multi-Stage Amplifier Troubleshooting process? - Answer: Check output, compare
measured Av to Calculated Av.
What is step 2 of the Multi-Stage Amplifier Troubleshooting process? - Answer: Check individual stage
gains.
What is step 3 of the Multi-Stage Amplifier Troubleshooting process? - Answer: Check components of
isolated stage, start with transistor.
What is step 4 of the Multi-Stage Amplifier Troubleshooting process? - Answer: If the transistor is not at
fault, turn off power and take resistance measurements. Replace Faulty component.
Questions (Frequently Most
Tested) with Verified Answers
Limiting action happens in series when a diode is________ and in parallel when a diode is________. -
Answer: Reverse biased, forward biased.
What is the purpose of a diode limiting circuit? - Answer: To limit amplitude of the input.
What do clampers do? - Answer: Add DC to AC signal.
A transistor in a Common Emitter transfers an internal resistance from a low resistance in emitter base
to? - Answer: High resistance in collector base.
Ie (Emitter current) = ? - Answer: Ib (base current) + Ic (collector current)
When does cutoff occur in a Common Emitter? - Answer: When Emitter PN junction is reversed.
A Common Emitter has a gain of how much? - Answer: 10
How does a Common Emitter affect the phase of an input signal? - Answer: It inverts the input 180° (flip)
A Common Collector has a gain of how much? - Answer: 1 (no phase inversion)
A Common Base has a gain of how much? - Answer: 10 (no phase inversion)
How do transistor amplifiers operate? - Answer: By an AC input signal changing base bias.
, The component that develops bias for a transistor part is directly connected to the_________. - Answer:
Corresponding transistor part.
In a Common Emitter, if base voltage (base bias) increases, emitter current does what? - Answer:
Increases.
A small input controls a__________. - Answer: Large output
What is the most common type of Multi-stage Amplifier? - Answer: RC (Resistive-capacitive)
What is the purpose of Cascade amplifiers? - Answer: To increase Av (Voltage Gain)
How is AvT (Total voltage gain) calculated in a Cascade Amplifier? - Answer: The product of individual
stage gains (Q1xQ2xQ3x...=AvT)
What is the typical gain for a three stage cascade amplifier (assumed value)? - Answer: 1,000
What is Cascading? - Answer: The connecting of multiple amplifiers in series.
What is step 1 of the Multi-Stage Amplifier Troubleshooting process? - Answer: Check output, compare
measured Av to Calculated Av.
What is step 2 of the Multi-Stage Amplifier Troubleshooting process? - Answer: Check individual stage
gains.
What is step 3 of the Multi-Stage Amplifier Troubleshooting process? - Answer: Check components of
isolated stage, start with transistor.
What is step 4 of the Multi-Stage Amplifier Troubleshooting process? - Answer: If the transistor is not at
fault, turn off power and take resistance measurements. Replace Faulty component.
