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Hvac > CRT- Electrical > Flashcards

CRT- Electrical Flashcards

1
Q

Be sure power is off when checking circuits with an ohmmeter.

True
False

A

True

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2
Q

Discharge capacitors with an insulated screwdriver before testing.

True
False

A

False

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3
Q

Stand on dry, non-conductive surface when testing live circuits.

True
False

A

True

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4
Q

Electrical meters are delicate test instruments; they should not be jolted or bumped.

True
False

A

True

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5
Q

What three components make up a complete electrical circuit?

A. Power source, connecting wire, and electrical circuit
B. Voltage, resistance, and load
C. Power source, bimetallic switch, and a load
D. Power source, SPST switch, and load

A

A. Power source, connecting wiring, and electrical circuit

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6
Q

The ohmmeter may explode if it comes in contact with line voltage.

True
False

A

True

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7
Q

What is not a conductor of electricity?

A. Copper
B. Aluminum
C. Wood
D. Iron

A

C. Wood

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8
Q

Ohm’s law establishes a mathematical relationship between voltage, amperage, and resistance.

True
False

A

True

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9
Q

Which meter is seldom used to test an electrical circuit?

A. Voltmeter
B. Ohmmeter
C. Ammeter
D. Wattmeter

A

D. Wattmeter

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10
Q

What meter is used to check for a grounded circuit?

A. Voltmeter
B. Wattmeter
C. Ammeter
D. Ohmmeter

A

D. Ohmmeter

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11
Q

When is the most accurate meter reading obtained?

A. When the battery is new
B. On the highest possible scale
C. In the center two-thirds of the scale
D. On the lowest possible scale

A

C. In the center two-thirds of the scale

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12
Q

What is a legend?

A. Drawing of the components in their approximate locations
B. Descriptive lists of the components
C. Drawing which represents a particular component
D. Drawing which uses symbols for circuit components

A

B. Descriptive lists of the components

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13
Q

Which is NOT a load?

A. Incandescent bulb
B. Transformer
C. Capacitor
D. Coil

A

C. Copacitor

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14
Q

The term “normally open” means the contact is open while the unit is operating.

True
False

A

False

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15
Q

If the proper voltage is available to a load and it doesn’t operate, the load is probably defective.

True
False

A

True

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16
Q

If proper voltage is NOT available to the load, the load is probably open.

True
False

A

False

17
Q

An electrical circuit consists of a power source, path for current flow and a load.

True
False

A

True

18
Q

Which is NOT a characteristic of a run capacitor?

A.more then 60 microfarad
B. Stays in the circuit
C. Is oil filled for cooling
D. Less then 60 microfarad

A

A. More then 60 microfarad

19
Q

What does the voltage rating of a capacitor tell the technician?

A. Voltage should not be higher
B. Voltage should not be lower
C. Voltage must be the same
D. Voltage can be +/- 20%

A

B. Voltage should not be lower

20
Q

Damage to the start winding may occur if the capacitor is improperly wired and becomes shorted.

True
False

A

True

21
Q

Witch is the national electric code requirement for circuit breakers that are less then 600 volts?

A. Shall be capable of automatic reset
B. Will have a visible “off” and “on” indication
C. Setting of tripping amperage requires dismantling
D. Shall be classified at not more then 100 amperes

A

A. Shall be capable of automatic reset

22
Q

The nation electric code does NOT require cartridge fuses of 30 amperes or less to be marked with a voltage rating.
True
False

A

False

23
Q

The national electrical code states that plug fuses shall NOT be used in circuits exceeding 125 Volts between conductors.

True
False

A

True

24
Q

Electrical motor windings are constructed with smaller wire than start windings.

True
False

A

False

25
Q

Electric motor supply voltage should be within 10% of data plate voltage.

True
False

A

True

26
Q

Like poles attract, while unlike poles repel.

True
False

A

False

27
Q

Which amperage would a motor draw when the rotor is not turning with power applied?

A. Locked rotor amps (LRA)
B. Starting amps (SA)
C. Full load amps (FLA)
D. Amps (A)

A

A. Locked rotor amps (LRA)

28
Q

When using an ohmmeter for testing, what reading indicates a good capacitor?

A. Needle stays on infinity
B. Needle swings toward zero and stays there
C. Needle swings toward zero and slowly returns to infinity
D. Needle swings towards zero and returns to a definite resistance

A

C. Needle swings towards zero and slowly returns to infinity

29
Q

When using an ohmmeter to test electric motors, what reading indicates it is OK?
A. Needle swings toward zero and slowly returns to infinity
B. Needle stays on infinity
C. Needle swings to zero and stays
D. Needle swings to a definite resistance and stays

A

D. Needle swings to a definite resistance and stays

30
Q

What causes most accidents?

A. Dangerous equipment
B. Old electrical wiring
C. Rough or sharp materials
D. Carelessness

A

D. Carelessness

31
Q

The human body is a good insulator of electrical current.

True
false

A

False

Hvac (18 decks)

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