Deck 46: Design of Circuit 2 Animal Feeder

Question 1

Pin #____ is the threshold for the capacitor of a 555 timer.

A) 4
B) 5
C) 6
D) 7

Answer 1

C

Question 2

When the timer is triggered in a 555 timer, the discharge, pin #____ turns off.

A) 4
B) 5
C) 6
D) 7

Answer 2

D

Question 3

If the sun is to be used as a timer, some type of photodetector will be required to sense when the sun rises and sets.

Answer 3

True

Question 4

When a circuit which is large and complex is to be designed, it is generally designed in ____.

A) grids
B) blocks
C) sections
D) series

Question 5

When the timer is triggered in a 555 timer, the output, pin #____, turns on.

A) 2
B) 3
C) 4
D) 5

Question 6

When the voltage applied to the inverting input becomes higher than the voltage applied to the noninverting input, the output changes to a high state.

Question 7

In the operation of the 555 timer, the trigger, pin #____, must be connected to a voltage less than one-third of Vcc to trigger the unit.

A) 2
B) 3
C) 4
D) 5

Question 8

In the presence of darkness, the resistance of the cad cell increases in value.

Question 9

A DC motor contains brushes and a commutator.

Question 10

When the cad cell is in the presence of light, its resistance is high.