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4th Period Electronics SAIT Alberta Electrician > Rect & Batt Charge Part 2 > Flashcards

Rect & Batt Charge Part 2 Flashcards

1
Q

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

A

Vdc = Vpeak x 0.318

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2
Q

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

A

True

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3
Q

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

A

Full-wave rectification.

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4
Q

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

A

0.637

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5
Q

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

A

True

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6
Q

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

A

False. Fout = Fin x 2

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7
Q

How do you calculate I LOAD ?

A

I load = Vdc AVG / R

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8
Q

What is a rectifier?

A

A device that changes A.C into D.C

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9
Q

Bridge Rectifiers contain how many diodes?

A

Four diodes

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10
Q

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

A

0.827

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11
Q

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

A

Block the line to line voltage

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12
Q

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

A

False. They have six diodes only

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13
Q

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

A

Fin x 6

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14
Q

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

A

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

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15
Q

Are battery chargers rated in voltage capacity or current capacity?

A

Current capacity

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16
Q

The three main sections of a battery charger are

A

Transformer
Rectifier
Heat Sink

17
Q

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

A

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

18
Q

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

A

It increases

19
Q

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

A

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

20
Q

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

A

0.955

21
Q

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

A

I LOAD / 3

22
Q

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

A

180 degrees

23
Q

Name the 4 Different Diode Types:

A

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

24
Q

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

A

Solid state devices

25
Q

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

A

No

26
Q

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

A

120

27
Q

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

A

Steering diodes or isolating diodes

28
Q

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

A

Vpeak of the secondary

29
Q

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

A

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

30
Q

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

A

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

31
Q

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

A

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

32
Q

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

A

2

4th Period Electronics SAIT Alberta Electrician (8 decks)

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