Rect & Batt Charge Part 2

Question 1

The average voltage output of the single-phase, half-wave rectifier is calculated with what formula?

Answer 1

Vdc = Vpeak x 0.318

Question 2

The ripple frequency output of a single phase, half-wave rectifier is the same frequency as the supply. T or F?

Answer 2

True

Question 3

A centre-tapped transformer with two diodes means that the load sees a voltage during both alternations. This is called what form of rectification?

Answer 3

Full-wave rectification.

Question 4

What is the average factor for a centre-tapped , full wave rectifier?

Answer 4

0.637

Question 5

Single-phase, full-wave bridge is the most used single-phase rectifier. T or F?

Answer 5

True

Question 6

The ripple frequency output in a single-phase, full-wave rectifier is the same as the input frequency. T or F?

Answer 6

False. Fout = Fin x 2

Question 7

How do you calculate I LOAD ?

Answer 7

I load = Vdc AVG / R

Question 8

What is a rectifier?

Answer 8

A device that changes A.C into D.C

Question 9

Bridge Rectifiers contain how many diodes?

Answer 9

Four diodes

Question 10

What is the AVG factor for a Three-Phase, half-wave rectifier?

Answer 10

0.827

Question 11

When one diode is conducting in a three-phase, half-wave rectifier, what are the other two diodes doing?

Answer 11

Block the line to line voltage

Question 12

Three Phase, Full-wave rectifiers have 4 to 6 diodes. T or F?

Answer 12

False. They have six diodes only

Question 13

The output frequency of a three-phase, full-wave is calculated how?

Answer 13

Fin x 6

Question 14

The current in a three-phase, full-wave diode is half of the average load current. T or F?

Answer 14

False. The diode current is one-third of the average load current.

Question 15

Are battery chargers rated in voltage capacity or current capacity?

Answer 15

Current capacity

Question 16

The three main sections of a battery charger are

Answer 16

Transformer
Rectifier
Heat Sink

Question 17

Name two other components that could be found in battery chargers besides a Transformer, Rectifier and Heat Sink:

Answer 17

Any of these five components:
- Overcurrent circuit breaker
- Ammeter
- Correct polarity indicator
- Charge time clock
- Power on indicator lamp

Question 18

What happens to the volts per turn on the transformer primary when the selector is changed from 12V low to 12V high?

Answer 18

It increases

Question 19

The load sees the large voltage and the diode blocks the low voltage. T or F?

Answer 19

False. The load sees the small voltage and diode blocks the high voltage

Question 20

What is the AVG factor for a three phase, full wave rectifier?

Answer 20

0.955

Question 21

What is the formula to find Diode Current in a Three-Phase, Full-Wave Rectifier?

Answer 21

I LOAD / 3

Question 22

What is the conduction angle for a single-phase, full-wave centre tap?

Answer 22

180 degrees

Question 23

Name the 4 Different Diode Types:

Answer 23

Axial Diode - UP TO 5A
Stud Mount - UP TO 600A
Power Module - UP TO 600A
Hockey Puk - UP TO 7000A

Question 24

Electronic devices made from semiconductor material are known as what sort of devices?

Answer 24

Solid state devices

Question 25

Is a neutral required for a three-phase, full wave rectifier?

Answer 25

No

Question 26

What is the conduction angle for a three-phase, half-wave rectifier?

Answer 26

120

Question 27

Directional or blocking diodes may also be called what sort of diodes?

Answer 27

Steering diodes or isolating diodes

Question 28

How do you calculate Vrrm of a full wave center tap rectifier?

Answer 28

Vpeak of the secondary

Question 29

What does this symbol represent in a Battery Charger wiring diagram?

Answer 29

Timing Motor or Timing Relay - Prevents the Battery from being overcharged

Question 30

What does this symbol represent in a Battery Charger wiring diagram?

Answer 30

LED - Polarity Indicator (when lit, indicates the correct polarity has been applied to the battery

Question 31

What does this symbol represent in a Battery Charger wiring diagram? What does it indicate?

Answer 31

Connected in parallel with the Source Voltage and indicates the Power is on to the charging circuit.

Question 32

How many Heat Syncs does a 3 Phase Full Wave rectifier need?

Answer 32

2