Download Aptitude Crack
img not found img not found

Flip-Flops

Q1:

In a 555 timer, three 5 k resistors provide a trigger level of ________.

A 1/4 VCC and a threshold level 1/2 VCC

B
1/3 VCC and a threshold level 3/4 VCC

C
1/3 VCC and a threshold level 2/3 VCC

D
1/4 VCC and a threshold level 2/3 VCC

ANS:C -

1/3 VCC and a threshold level 2/3 VCC

The 555 timer IC is an amazingly simple yet versatile device. The IC is quiescent so long as the trigger input (pin 2) remains at +VCC.
The three resistors in the voltage divider all have the same value (5K in the bipolar).

This doesn't give us absolute values for "e" or "E," but it does give us the ratio e/E = 2/3.



img not found
img

For help Students Orientation
Mcqs Questions

One stop destination for examination, preparation, recruitment, and more. Specially designed online test to solve all your preparation worries. Go wherever you want to and practice whenever you want, using the online test platform.