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ATT Test 7- Questions & Complete Solutions (100%)
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ATT Test 7- Questions & Complete Solutions (100%)
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ATT Test 7- Questions & Complete Solutions (100%)What is the purpose of multivibrators? Right Ans - Convert DC ENERGY
into SQUARE WAVE ENERGY
How are transistors biased in multivibrators? Right Ans - To be in EITHER
saturation or cutoff, NEVER inbetween
What component determines which transistor is ON or OFF in multivibe
circuit? Right Ans - Feedback circuit
What does it mean when a transistor is ON? How many volts on collector?
Right Ans - Saturation (MAX current flow), 0 V
What does it mean when a transistor is OFF? How many volts on collector?
Right Ans - Cutoff (no current flow), 12 V
If both transistors have outputs (multivibe), what is phase shift between
them? Right Ans - 180
Which type of multivibe circuit is free running? Right Ans - Astable
What components are in feedback circuit (Astable)? Right Ans - Two
capacitors
What components are in feedback circuit (monostable)? Right Ans - One
capacitors and one resistor
What components are in feedback circuit (bistable)? Right Ans - Two
capacitors, two resistors
How is output determined in astable multivibe? Right Ans - Determined by
feedback circuit
Which transistor conducts first in astable multivibe? Right Ans - Whichever
reaches 0.6V first (Vcc applied, pos volts on Q1/Q2 base)
With Q1 ON (0v), how is Q2 turned off? (Astable) Right Ans - C1
discharging puts negative charge to Q2 base
, With Q1 ON (0V), how is Q2 turned ON? (Astable) Right Ans - C1 charging
increases volts Q2 base
With Q2 ON (0V), how is Q1 turned OFF? (Astable) Right Ans - C2
discharging puts negative charge to Q1 base
With Q2 ON (0V), how is Q1 turned ON? (Astable) Right Ans - C2 charging
increases volts Q1 base
What is another name for monostable multivibe? Right Ans - One Shot
How is frequency determined in monostable multivibe? Right Ans - Output
frequency = Input frequency
How is Q1 turned on (monostable)? Right Ans - Input pulse forward biases
D1 and is applied to Q1 base
What happens when Q1 turns on (monostable)? Right Ans - C1 discharges
and turns OFF Q2 (12V)
When Q1 is ON, what causes it to turn OFF? (monostable) Right Ans - C1
charges enough to turn Q2 ON which turns Q1 off
How is frequency determined in bistable multivibes? Right Ans - Output
frequency is 1/2 Input frequency
If Q1 conducts first (ON 0V), how is Q2 turned OFF? (bistable) Right Ans -
Negative volts on Q2 base coupled through capacitor
With Q1 ON, how is Q1 turned OFF? (Bistable) Right Ans - Negative pulse
from INPUT forward biases D1, negative signal turns Q1 OFF
With Q1 OFF, how is Q2 turned ON? (Bistable) Right Ans - !2V on Q1
collector coupled to Q2 base by capacitor
What is troubleshooting procedure for astable multivibes? Right Ans -
Check output, Vcc, transistors, resistance checks
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