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Motors > C > Flashcards

C Flashcards

1
Q

Delta low voltage connection is connected in?

A

Parallel.

3 groups of 3 leads

9 leads at JB. T1-T9

3 leads are internal

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2
Q

What voltage is for low voltage and what voltage is for high voltage

A

Low = 230v

High - 460v

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3
Q

Wye low voltage is connected in?

A

Parallel

3 groups of 2 leads

1 group of 3 leads

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4
Q

Both delta and wye high voltage are connected in?

A

Series

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5
Q

Motor starters can be either?

A

Across the line starters or
Reduce full voltage starters

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6
Q

Full voltage starters typically produce a starting current that is?

A

500% - 600% of full load current and

Starting torque that is 150% of full load torque

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7
Q

Across the line starters can be?

A

Manual or magnetic starter design

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8
Q

Manual motor starters use a?

A

Manual open close switch

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9
Q

Magnetic starter uses?

A

Electrically operated switch

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10
Q

What are these symbols?

A

TDOE - time delay on energization

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11
Q

What are these symbols

A

TDOD
Timed delay on de energization

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12
Q

What kind of taps can an auto transformer have?

A

80, 65, or 50% taps

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13
Q

The starting currents % to the starter are?

A

64, 42 and 25% of full voltage starting current

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14
Q

Auto transformer starters can be?

A

Open or closed transition starters

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15
Q

Wye delta starting requires a Delta motor that has ____ terminal leads?

A
  1. T1- t6

Connected in wye for starting and reconnected in delta for running

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16
Q

When a motor is connected in wye to start, the in rush current and torque can be reduced to?

A

33 1/3%

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17
Q

For an open transition wye delta start the overload settings are based on?

A

57.7% of full load current

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18
Q

Which starter can be used as a disconnecting means by the CEC?

A

Manual

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19
Q

A six lead motor has T1 T2 T3 T7 T8 and T9. what type of motor is it?

A

Wye

20
Q

How many conductors must be run between a part winding motor and starter?

A

6

21
Q

The line starting current of an auto transformer starter is?

A

Less than the motor starting current

22
Q

What is the main intent of using reduced voltage starters

A

Reduces in rush starting current

23
Q

What is meant by current limit starting when provided by a soft starter?

A

Current limit starting restricts the starting current to a max value

24
Q

What’s the best choice of starter if you required the gradual acceleration of a constant torque load?

A

Soft starter

25
Q

Is 3 phase power always available?

A

No

26
Q

Phase converters have several applications in industries that have a single phase service including?

A

Farms
Small industrial plants
Woodworking shops
Metal fabrication shops

27
Q

Which motor is more complicated?

A

Single phase motors

28
Q

Single phase motor attributes are?

A

Have more parts
Are noisier
Are larger
Require more maintenance

29
Q

3 phase motor attributes are?

A

Less expensive
More readibly available
Smaller
Quieter

30
Q

What is a phase converter?

A

Controllers that allow one or more 3 phase motors to run on Single phase system

31
Q

What are 2 types of phase converters?

A

Rotary and static phase converter

32
Q

Which phase converter produces better output?

A

Rotary because it uses the a motor generator

33
Q

What is the main component of a rotary phase converter?

A

Induction motor generator

34
Q

What are two power ratings of a rotary phase converter?

A

Max hp run, max hp start

35
Q

If more than one phase converter motor is started which one should be stated first?

A

The largest

36
Q

What type of capacitor does a phase converter need for starting?

A

Electrolytic

37
Q

What type of capacitor does a phase converter need for running?

A

Film or pull filled

38
Q

What does an auto transformer do?

A

Adjusts the voltages to the 3rd line using taps?

39
Q

Which line of a phase converter has consists current regardless of the load?

A

L3

40
Q

Part winding starter has ___ leads?

A

Six

41
Q

Soft starters have two acceleration modes. What are they?

A

Ramp starting

Current limit starting

42
Q

Single phase motors are not available above ___ hp?

A

15

43
Q

Single phase motors are not common above ___ hp?

A

5

44
Q

A _____motor starter is the best choice for motor control?

A

Magnetic

45
Q

A small machine shop installed a 3 phase exhaust fan. What type of phase converter should be used?

A

Static

46
Q

On a farm or wood shop what is the best phase converter to use?

A

Rotary

Motors (5 decks)

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