Deck 34: The 555 Timer Used As an Oscillator

Question 1

In the accompanying figure, the time it takes C1 to discharge is determined by the resistance of C1 and  the capacitance of R2.

Answer 1

False

Question 2

The ____ pin of a 555 timer can give complete control of the on time of the timer, although it does not  affect the off time.

A) ground
B) control voltage
C) output
D) pulse

Answer 2

B

Question 3

One of the most common functions of the 555 timer is that of a(n) _____.

A) inverter
B) rectifier
C) oscillator
D) sink

Answer 3

C

Question 4

Complete control of the on time in a 555 timer can be gained by using a variable resistor as a ____.

A) potentiometer
B) limiter
C) variostat
D) transistor

Question 5

In the accompanying figure, when the discharge at pin #7 turns off, capacitor C1 begins charging  through resistors R1 and R2.

Question 6

If the control voltage pin of a 555 timer is connected to ground through a ____, the on time will be  shorter and the off time will remain the same.

A) triac
B) diac
C) semiconductor
D) resistor

Question 7

In the accompanying figure, pin #2 being connected to pin #6 permits the timer to retrigger itself at the  end of each time cycle.

Question 8

When the 555 timer triggers, two things happen at the same time: the output turns on and the discharge  turns on.

Question 9

Pin #____ in a 555 timer is the control voltage pin.

A) 3
B) 4
C) 5
D) 6

Question 10

When the 555 timer has pin #2 connected to pin #6, this permits the timer to retrigger itself at the end  of each time cycle.