Q.1

Which mode of operation is being used when a 555 timer chip has two external resistors and an external capacitor?

  • monostable
  • pulse stretching
  • Schmitt triggering
  • astable
Q.2

What does the discharge transistor do in the 555 timer circuit?

  • charge the external capacitor to stop the timing
  • charge the external capacitor to start the timing over again
  • discharge the external capacitor to stop the timing
  • discharge the external capacitor to start the timing over again
Q.3

A multivibrator is a circuit that changes between two digital levels on a continuous, free-running basis or on demand.

  • True
  • False
Q.4

The 74S124 TTL chip is a voltage-controlled oscillator that will generate a specific frequency at Vout.

  • True
  • False
Q.5

A single Schmitt trigger inverter is all that is needed to build a simple astable multivibrator.

  • True
  • False
Q.6

A monostable multivibrator is commonly called a two shot.

  • True
  • False
Q.7

What does the discharge transistor do in the 555 timer circuit?

  • charge the external capacitor to stop the timing
  • charge the external capacitor to start the timing over again
  • discharge the external capacitor to stop the timing
  • discharge the external capacitor to start the timing over again
0 h : 0 m : 1 s