PPT #3/4 Notes

Question 1

The _______ section of a power supply removes ripple, flattening the pulsating DC to make a more consistent load line.

Answer 1

filter

Question 2

Filter circuit stores _______ when current is high and releases when _____

Answer 2

energy

low

Question 3

A power source filter is combination of? (3)

Answer 3

Capacitors
Inductors
Resistors

Question 4

Capacitor stores _______
Inductor stores _______-_______
Resistor is a voltage _______ device

Answer 4

voltage
magnetic-field
dropping

Question 5

As pulsating voltage from the rectifier is applied to the capacitor, it charges to the _____ voltage applied

Answer 5

peak

Question 6

The capacitive filter is connected in ________ with the load device

Answer 6

parallel

Question 7

Between peaks, the capacitor discharges through the load and _____ gradually drop

Answer 7

volts

Question 8

What is the amount of voltage drop before the capacitor begins to charge again called? It never goes to zero volts

Answer 8

Ripple voltage

Question 9

RC stands for?

Answer 9

Recharge time

Question 10

Adv and Disadv of capacitive filters?

Answer 10

low cost and low ripple at low load

high ripple at high load

Question 11

Over time, surge currents may damage circuit fuses and diodes. True or false?

Answer 11

True

Question 12

Purpose of and L section resistive filter?

Answer 12

Reduces surge currents

Question 13

How does an L-section resistive filter reduce surge currents?

Answer 13

with a current limiting resistor that uses an RC time constant to slow charging of capacitor

Question 14

Resistor should always be connected in _____ with the rectifier

Answer 14

series

Question 15

Resistor connected in series with the rectifier serves what purpose?

Answer 15

protects it from high surge charging currents

Question 16

The surge reducing device is known as a ?

Answer 16

current limiting inductor (coil)

Question 17

On which principle does a current limiting inductor work?

Answer 17

counter electromotive force (CEFM) or counter voltage to oppose current

Question 18

Two types of pi-section filters are?

Answer 18

Inductive and resistive

Question 19

Which filters are more effective, Inductive or Resistive?

Answer 19

Inductive

Question 20

The requirements of the _____ determine if voltage regulation is required

Answer 20

load

Question 21

The voltage regulator is variable resistance that automatically changes as the output voltage changes. True or False?

Answer 21

True

Question 22

Load current flows through a variable resistor and creates a ______ _____ across

Answer 22

voltage drop

Question 23

The variable resistor and the load create a ___ voltage divider

Answer 23

DC

Question 24

Resistance to maintain constant voltage drop can be adjusted even when input variations occur. True or False?

Answer 24

True

Question 25

To maintain voltage drop across the load. The resistance can be _________

Answer 25

reduced

Question 26

The limitation of a variable resistor circuit is?

Answer 26

it must be operated manually

Question 27

A _______ is a variable resistor in parallel

Answer 27

shunt

Question 28

A shunt regulator combined with the resistance of the power supply itself,
or with an additional resistor, forms a ______ ________

Answer 28

voltage divider

Question 29

As shunt resistance increases, more voltage appears across it as an output to the load. True or False?

Answer 29

True

Question 30

As shunt resistance decreases, voltage across decreases. True or False?

Answer 30

True

Question 31

The resistance of a shunt regulator increases when the output voltage _________

Answer 31

decreases

Question 32

A voltage _______ distributes the available voltage into those voltages required by the various loads.

Answer 32

divider

Question 33

When is a voltage regulator used?

Answer 33

When it is required to provide voltages for loads with different voltage requirements