Multivibrators and 555 Timer Questions and Answers
Practice ModeShowing 10 of 45 questions
Q21
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.
Answer: Option D
Q22
What is another name for a bistable multivibrator?
Answer: Option C
Q23
An astable 555 timer has the following number of stable states:
Answer: Option A
Q24
Which mode of operation is being used when a 555 timer chip has two external resistors and an external capacitor?
Answer: Option D
Q25
Which of the following is NOT a characteristic of a retriggerable monostable multivibrator?
Answer: Option B
Q26
The pulse width out of a one-shot multivibrator increases when the:
Answer: Option A
Q27
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?
Answer: Option C
Q28
If Vcc of a 555 timer circuit is set to +10 V what is the level of output voltage from the circuit?
Answer: Option D
Q29
When extremely critical timing is required, a quartz crystal can be used.
Answer: Option A
Q30
In the 74121, which is nonretriggerable, any triggers that come in before the end of the timing cycle are ignored.
Answer: Option A