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Electrical RACM Year 2 > General > Flashcards

General Flashcards

1
Q

Motors convert electrical energy into what?

A

Mechanical energy.

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2
Q

What is a PSC motor?

A

Permanent split.

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3
Q

How many windings are in a single phase motor?

A

Two, start and run.

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4
Q

What are the 4 parts of a single phase motor?

A

Stator, frame, rotor/shaft and the end bells.

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5
Q

Where are the run windings located?

A

At the bottom of the stator slots.

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6
Q

When are the run windings connected?

A

They are connected continiously.

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7
Q

Do the run windings have a large, or small conductor?

A

A large conductor.

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8
Q

Where is the start winding found?

A

In the top of the stator slots.

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9
Q

When are the start windings disconnected from the circuit?

A

When the motor reaches 75 percent of its rated speed.

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10
Q

Does the run or start winding have more resistance?

A

The start winding has more resistance.

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11
Q

Is a centrifugal switch normally opened or normally closed?

A

A centrifugal switch is normally closed.

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12
Q

In which motor is the start winding de-energized after the motor reaches 75 percent of its rated speed?

A

RSIR or resistive start induction run motor.

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13
Q

Which motor has about 300 percent more starting torque than running torque?

A

CSIR or capacitor start induction run motor.

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14
Q

In a CSCR motor, is the run or start capacitor disconnected when the motor reaches 75 percent of it’s rated speed?

A

The start capacitor is removed from the circuit.

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15
Q

What are the characteristics of a PSC motor?

A

Both windings and capacitor stay in the circuit continuously, and the run capacitor is oil filled.

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16
Q

What is unique about a shaded pole motor?

A

It has a shading coil that creates a small amount of MMF in the core.

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17
Q

Is a high voltage motor connected in series, or parallel?

A

A high voltage motor is connected in series.

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18
Q

Is a low voltage motor connected in series or parallel?

A

A low voltage motor is connected in parallel.

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19
Q

Which relay uses a low resistive coil and and a set of normally open contacts?

A

The current relay.

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20
Q

Which motor uses a potential relay?

A

A potential relay is found with a CSCR motor.

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21
Q

A 2 pole contactor has how many loads?

A

One single phase load.

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22
Q

A 3 pole contactor has how many loads?

A

Three, single phase loads.

23
Q

What is a motor starter?

A

A contactor plus over-loads is a motor starter.

24
Q

What is the SI measurement for torque?

A

The newton.

25
Q

What is connected in series with the start winding?

A

The start capacitor.

26
Q

A motor with a service factor of less than 1.15 has the overloads set to what?

A

115% of it’s rated FLA.

27
Q

A motor with a service factor of more than 1.15 has the overloads set to what?

A

125% of it’s rated FLA.

28
Q

How do you wire multiple start buttons?

A

In parallel.

29
Q

How do you wire multiple stop buttons?

A

In series.

30
Q

What are three things required to create an AC voltage?

A

A magnetic field, a current carrying conductor, and relative motion.

31
Q

What does a transformer consist of?

A

Two windings, and one common core.

32
Q

What motor has the lowest starting torque?

A

The RSIR motor.

33
Q

What motor has the highest starting torque?

A

The CSIR motor.

34
Q

Which motor has the lowest starting current?

A

The CSCR motor.

35
Q

Which motor has the run cap left in at all times?

A

The PSC motor.

36
Q

Does a shaded pole motor have high, or low torque?

A

Very small amounts of torque.

37
Q

How is a potential relay wired?

A

In parallel with with the start winding. Disconnects the start cap while running. Known as the 5,2,1 relay.

38
Q

How is a current relay wired?

A

In series with the run winding. and has N/O contacts. Attaches directly to the compressor terminals.

39
Q

Does a potential relay have a low, or a highly resistive coil?

A

It has a low resistive coil.

40
Q

Which motor has the highest starting torque, the lowest current, and is the most expensive?

A

CSCR (Capacitor start, capacitor run)

41
Q

Which capacitors are electrolytic and designed to only be in the circuit for a few seconds?

A

Start capacitors.

42
Q

What motor is the most suitable as a belt driven motor, and why?

A

The CSIR motor, because of it’s high starting torque.

43
Q

What section describes class 1 and 2 circuits?

A

Section 16.

44
Q

What are extra low voltage power circuits restricted to?

A

A maximum of 30V and a maximum power level of 1000 vA.

45
Q

What are class 1 remote control circuits limited to?

A

A maximum of 600V.

46
Q

What section of the CEC covers the Scope?

A

Section 16-000.

47
Q

What is the formula for line voltage?

A

Phase voltage x 1.732

47
Q

What is considered extra low voltage?

A

0-30 VAC

48
Q

What is considered low voltage?

A

600-1000 VAC

49
Q

What is considered high voltage?

A

Over 1000 VAC

50
Q

What does a signal circuit energize?

A

A bell, or a light.

51
Q

What does a remote control energize?

A

A relay coil or a contactor.

52
Q
A

Electrical RACM Year 2 (1 decks)

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