ATT Week 7 Exam UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
What is the purpose of multivibrators? - CORRECT ANSWER Changes DC operating voltage
to sqaure waves.
What are multivibrators made of? - CORRECT ANSWER 2 transistors and a feedback circuit
Free running Multivibrators generate a square wave output.... - CORRECT ANSWER Anytime
the operating voltage is applied.
Triggered multivibrators produce a square wave... - CORRECT ANSWER When an external
input is applied.
The type of multivibrator circuit depends on... - CORRECT ANSWER The feedback circuit
components
An astable multivibrator has no... - CORRECT ANSWER Stable state condition, it is free
running
A monostable multivibrator has... - CORRECT ANSWER One stable state, it is triggered
A bistable multivibrator has... - CORRECT ANSWER Two stable states, it is triggered
A stable state is... - CORRECT ANSWER A steady condition(output stays the same)
What happens when power is applied in an Astable Multivibrator? - CORRECT ANSWER Q1
and Q2 switch between on or off.
What happens to Q1 and Q2 in a monostable multivibrator? - CORRECT ANSWER Q2 is on,
Input pulse causes Q2 to turn off and Q1 to turn on
, A transistor in a multivibrator is on in ____________ - CORRECT ANSWER Saturation
A transistor in a multivibrator is off in __________ - CORRECT ANSWER Cutoff
What happens to Q1 and Q2 in a bistable multivibrator? - CORRECT ANSWER Either Q1 or
Q2 could be on, input pulse causes either to turn off and the other to turn on.
How is an Astable multivibrator identified? - CORRECT ANSWER Two capacitors in the
feedback circuit.
How is a monostable multivibrator identified? - CORRECT ANSWER One capacitor and one
resistor in the feedback circuit.
How is a bistable multivibrator identified? - CORRECT ANSWER Two capacitors and two
resistors in feedback circuit.
What is the purpose of R1 in an Astable Multivibrator Circuit? - CORRECT
ANSWER Collector Load Resistor
What is the purpose of R3 in an Astable Multivibrator Circuit? - CORRECT ANSWER Base
bias resistor for Q1
What is the purpose of R2 in an Astable Multivibrator Circuit? - CORRECT ANSWER Base
bias resistor for Q2
What is the purpose of R4 in an Astable Multivibrator Circuit? - CORRECT
ANSWER Collector load resistor for Q2
What are the outputs of Q1 and Q2 in an Astable Multivibrator Circuit? - CORRECT
ANSWER 180° out of phase
What is the purpose of R5 in an Astable Multivibrator Circuit? - CORRECT ANSWER Adjusts
Symmetry of the output waveform.
QUESTIONS AND CORRECT ANSWERS
What is the purpose of multivibrators? - CORRECT ANSWER Changes DC operating voltage
to sqaure waves.
What are multivibrators made of? - CORRECT ANSWER 2 transistors and a feedback circuit
Free running Multivibrators generate a square wave output.... - CORRECT ANSWER Anytime
the operating voltage is applied.
Triggered multivibrators produce a square wave... - CORRECT ANSWER When an external
input is applied.
The type of multivibrator circuit depends on... - CORRECT ANSWER The feedback circuit
components
An astable multivibrator has no... - CORRECT ANSWER Stable state condition, it is free
running
A monostable multivibrator has... - CORRECT ANSWER One stable state, it is triggered
A bistable multivibrator has... - CORRECT ANSWER Two stable states, it is triggered
A stable state is... - CORRECT ANSWER A steady condition(output stays the same)
What happens when power is applied in an Astable Multivibrator? - CORRECT ANSWER Q1
and Q2 switch between on or off.
What happens to Q1 and Q2 in a monostable multivibrator? - CORRECT ANSWER Q2 is on,
Input pulse causes Q2 to turn off and Q1 to turn on
, A transistor in a multivibrator is on in ____________ - CORRECT ANSWER Saturation
A transistor in a multivibrator is off in __________ - CORRECT ANSWER Cutoff
What happens to Q1 and Q2 in a bistable multivibrator? - CORRECT ANSWER Either Q1 or
Q2 could be on, input pulse causes either to turn off and the other to turn on.
How is an Astable multivibrator identified? - CORRECT ANSWER Two capacitors in the
feedback circuit.
How is a monostable multivibrator identified? - CORRECT ANSWER One capacitor and one
resistor in the feedback circuit.
How is a bistable multivibrator identified? - CORRECT ANSWER Two capacitors and two
resistors in feedback circuit.
What is the purpose of R1 in an Astable Multivibrator Circuit? - CORRECT
ANSWER Collector Load Resistor
What is the purpose of R3 in an Astable Multivibrator Circuit? - CORRECT ANSWER Base
bias resistor for Q1
What is the purpose of R2 in an Astable Multivibrator Circuit? - CORRECT ANSWER Base
bias resistor for Q2
What is the purpose of R4 in an Astable Multivibrator Circuit? - CORRECT
ANSWER Collector load resistor for Q2
What are the outputs of Q1 and Q2 in an Astable Multivibrator Circuit? - CORRECT
ANSWER 180° out of phase
What is the purpose of R5 in an Astable Multivibrator Circuit? - CORRECT ANSWER Adjusts
Symmetry of the output waveform.
