FUNCTIONAL BLOCK DIAGRAM OF 555 TIMER IC

Knowledge: What is the basic function of the 555 timer IC?

• A. Comparator
• B. Oscillator
• C. Amplifier
• D. Filter

Knowledge: What is the supply voltage range of the 555 timer IC?

• A. 1.5V to 5.5V
• B. 5V to 12V
• C. 10V to 18V
• D. 18V to 36V

Knowledge: What are the three operational modes of the 555 timer IC?

• A. Astable, monostable, bistable
• B. Bistable, bipolar, monostable
• C. Astable, bipolar, monostable
• D. Bistable, astable, unistable

Comprehension: Which pin of the 555 timer IC is responsible for the threshold input?

• A. Pin 2
• B. Pin 3
• C. Pin 4
• D. Pin 5

Comprehension: What is the function of the discharge pin (Pin 7) in the 555 timer IC?

• A. To reset the timer
• B. To discharge the timing capacitor
• C. To connect the IC to the power supply
• D. To output the timing signal

Comprehension: In astable mode, what is the duty cycle of the output waveform of the 555 timer IC?

• A. 50%
• B. 75%
• C. 80%
• D. It depends on the values of the timing components

Application: Design an astable circuit using a 555 timer IC that produces an output frequency of 2 kHz and a duty cycle of 60%. What values of R1, R2, and C are required?

• A. R1 = 10 kohm, R2 = 33 kohm, C = 100 nF
• B. R1 = 33 kohm, R2 = 10 kohm, C = 10 nF
• C. R1 = 47 kohm, R2 = 10 kohm, C = 10 nF
• D. R1 = 10 kohm, R2 = 47 kohm, C = 10 nF

Application: Design a monostable circuit using a 555 timer IC that produces an output pulse width of 500 ms when triggered by a negative edge. What values of R and C are required?

• A. R = 10 kohm, C = 0.1 uF
• B. R = 47 kohm, C = 1 uF
• C. R = 22 kohm, C = 0.22 uF
• D. R = 33 kohm, C = 0.33 uF