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Havc Phase 1 > Fundamentals Of Electricity > Flashcards

Fundamentals Of Electricity Flashcards

1
Q

Which test instrument is used to read electrical pressure?

A

Volt meter

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2
Q

The_______is used to read the current flowing through the conductor

A

Amp meter

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3
Q

To read voltage the meter probes are placed_________the switch or the load

A

Across

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4
Q

Which test instrument has its own power source

A

Ohm meter

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5
Q

If the clamp-on ammeter is around one L1 conductor and one L2 conductor the reading will be?

A

Incorrect

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6
Q

The rules for operating the________is, turn the power off, isolate the component, select the proper scale and zero the meter

A

Ohm meter

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7
Q

What are the rules for using the clamp-on meter ammeter?

A

Only clamp one wire at a time

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8
Q

The rules for using the voltmeter are?

A

Start at the highest rang if voltage is not known

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9
Q

What is the power source used to energize the voltmeter?

A

Source voltage

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10
Q

When using the voltmeter, if voltage is read across the switch being tested, is the switch opened or closed?

A

Opened

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11
Q

A complete circuit is when_____is read across the load

A

Voltage

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12
Q

If voltage is read across the load, but the load is not energized than the load is?

A

Bad

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13
Q

What is the diagnosis if power is applied to the system but no voltage is read across the load?

A

Open circuit

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14
Q

To find a bread in the circuit a troubleshooting procedure called_________is used

A

Hopscotch

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15
Q

Which method of testing a fuse is more reliable, using the voltmeter or using the ohmmeter?

A

Ohmmeter

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16
Q

When testing motor leads to determine common, start or run, which test instrument is used?

A

Ohmmeter

17
Q

Between which two terminals will you test the highest ohm reading?

A

Between run and start

18
Q

When testing a motor winding with the ohmmeter and zero ohms is read, what is the diagnosis?

A

It’s a short motor winding

19
Q

When testing a motor winding with the ohmmeter and infinite is read, what is the diagnosis?

A

It’s a open winding

20
Q

If a measurable reading is indicated across the motor winding, what condition does this indicate?

A

The windings are good

21
Q

A shorted run winding would read 0.0 between what pins on the compressor?

A

Common and run

22
Q

If the start to common ohm reading is 12 ohms and the run winding is, shorted what would you read between start and run?

A

12 ohms

23
Q

If a measurable reading is read between run and start, but infinite between common and run and common and start, what is the diagnosis?

A

Open I.P.

24
Q

A________ _________rated at 2 watts and 20,000 ohms is used to discharge capacitors

A

Bleed resistor

25
Q

The only truly reliable method of testing capacitors, is to use what testing instrument?

A

Capacitor analyzer

26
Q

On dual capacitors, witch motor windings are connected to the common terminal?

A

Run and start

27
Q

The rules for replacing run capacitors are, voltages____________and the microfarad rating is the same

A

Same or higher

28
Q

When testing a run cap the microfarad rating should be within + or - __________unless a smaller allowance is on the label

A

10%

29
Q

If two run capacitors are wired parallel, one is rated at 15 mfd and the other is rated at 10 mfd, what is the total capacitance for the motor?

A

25 mfd

30
Q

If the run capacitor is__________the start winding will draw higher than normal amperage

A

Decrease MFD rating

31
Q

When testing a PSR what ohm reading would be expected across pins 2 and 5?

A

3,000 to 14,000 ohms

32
Q

A start cap is using a 2 watt 20,000 ohm resistor across the terminals to protect the____________from welding closed when the PSR contacts are closed

A

PSR contacts

Havc Phase 1 (1 decks)

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