Electronics II Quiz

What does "IC" stand for in electronics?

• A) Internal Component
  

• B) Integrated Circuit

• C) Input Current

• D) Insulated Chip

Why is the 555 timer called "555"?

• A) It was the 555th invention of Signetics

• B) It uses three 5kΩ resistors internally

• C) It operates at 555 Hz

• D) It has 5 inputs and 5 outputs

3. How many pins does a 555 timer IC have?

• A) 6

• B) 7

• C) 8

• D) 9

What is inside a 555 timer IC?

• A) Flip-flops, comparators, resistors, and transistors

• B) Only a single transistor

• C) A microcontroller

• D) A set of logic gates

In monostable mode, the 555 timer produces a pulse when:

• A) Power is turned ON

• B) Triggered by an external pulse

• C) The reset pin is HIGH

• D) The threshold voltage exceeds 2V

What is the function of the discharge pin (Pin 7) in a 555 timer?

• A) Charges the capacitor

• B) Controls the output voltage

• C) Discharges the timing capacitor

• D) Supplies power to the circuit

In astable mode, the 555 timer:

• A) Continuously oscillates without external trigger

• B) Requires a trigger for each pulse

• C) Can only produce a single pulse

• D) Works as a simple voltage regulator

What determines the output frequency in an astable 555 circuit?

• A) The resistor and capacitor values

• B) The input voltage

• C) The output current

• D) The duty cycle

In a 555 monostable circuit, increasing the capacitor value will:

• A) Increase the output pulse duration

• B) Decrease the output voltage

• C) Have no effect

• D) Make the circuit astable

What is the typical voltage range of a 555 timer?

• A) 4.5V to 15V

• B) 1V to 5V

• C) 9V to 24V

• D) 12V to 30V