Multivibrators and 555 Timer - General Questions Online Exam Quiz
Multivibrators and 555 Timer - General Questions GK Quiz. Question and Answers related to Multivibrators and 555 Timer - General Questions. MCQ (Multiple Choice Questions with answers about Multivibrators and 555 Timer - General Questions
What is the function of the comparators in the 555 timer circuit?
Options
A : to compare the output voltages to the internal voltage divider
B : to compare the input voltages to the internal voltage divider
C : to compare the output voltages to the external voltage divider
D : to compare the input voltages to the external voltage divider
When a capacitor charges:
Options
A : the voltage across the plates rises exponentially
B : the circuit current falls exponentially
C : the capacitor charges to the source voltage in 5× RC seconds
D : all of the above
The ________ is defined as the time the output is active divided by the total period of the output signal.
Options
A : on time
B : off time
C : duty cycle
D : active ratio
A 22-k resistor and a 0.02- F capacitor are connected in series to a 5-V source. How long will it take the capacitor to charge to 3.4 V?
Options
A : 0.44 ms
B : 0.501 ms
C : 0.66 ms
D : 0.70 ms
What does the discharge transistor do in the 555 timer circuit?
Options
A : charge the external capacitor to stop the timing
B : charge the external capacitor to start the timing over again
C : discharge the external capacitor to stop the timing
D : discharge the external capacitor to start the timing over again
Pulse stretching, time-delay, and pulse generation are all easily accomplished with which type of multivibrator circuit?
Options
A : astable
B : monostable
C : multistable
D : bistable
The internal circuitry of the 555 timer consists of ________, an R-S flip-flop, a transistor switch, an output buffer amplifier, and a voltage divider.
Options
A : a comparator
B : a voltage amplifier
C : two comparators
D : a peak detector
With most monostable multivibrators, what is the Q output when no input trigger has occurred?
Options
A : LOW
B : +5 V
C : SET
D : HIGH
An astable multivibrator requires:
Options
A : balanced time constants
B : a pair of matched transistors
C : no input signal
D : dual J - K flip-flops
A crystal demonstrates the ________ effect when a mechanical force across the crystal causes a small voltage to be generated.
Options
A : photoelectric
B : Co-pitts
C : piezoelectric
D : flywheel
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