Curioustab
Aptitude
General Knowledge
Verbal Reasoning
Computer Science
Interview
Aptitude
General Knowledge
Verbal Reasoning
Computer Science
Interview
Multivibrators and 555 Timer Questions
If Vcc of a 555 timer circuit is set to +10 V what is the level of output voltage from the circuit?
In a typical IC monostable multivibrator circuit, at the falling edge of the trigger input, the output switches HIGH for a period of time determined by the ________.
If a diode is connected across resistor RB (positive end up) in the given figure, what is the new duty cycle of the output waveform?
To obtain a 50% duty cycle in an astable 555 timer circuit:
An astable multivibrator requires:
A crystal demonstrates the ________ effect when a mechanical force across the crystal causes a small voltage to be generated.
Is there any limit to the number of times that a 74123 can be retriggered?
Determine tHI and tLO for the circuit given below.
An astable 555 timer has the following number of stable states:
What is the output pulse width of the waveform at the output of the circuit in the given figure?
What is the difference between an astable multivibrator and a monostable multivibrator?
A retriggerable one shot has a pulse of 10 ms. 3 ms after being triggered, another trigger pulse is applied. The resulting output pulse will be ________ ms.
Which mode of operation is being used when a 555 timer chip has two external resistors and an external capacitor?
If the resistor in the Schmitt trigger astable multivibrator is a variable resistor, what part of the output voltage waveform will change when the resistance is changed?
The ________ is defined as the time the output is active divided by the total period of the output signal.
What is the function of the comparators in the 555 timer circuit?
Is the circuit given below an astable multivibrator or a monostable multivibrator?
A 22-kΩ resistor and a 0.02-µF capacitor are connected in series to a 5-V source. How long will it take the capacitor to charge to 3.4 V?
Triggering a retriggerable one shot during pulse generation will:
The monostable multivibrator circuit is not an oscillator because ________.
1
2
3