Relay Final

Question 1

What are other names for an elementary diagram?

Answer 1

schematic or 1 line diagram, Elementry

Question 2

How does a reversible motor starter change direction on a 3 phase motor?

Answer 2

Change any two leads

Question 3

What is the formula for figuring the speed of a motor?

Answer 3

Speed =2 (60) (60)
  RBN.   ---------------------
                 # of Poles

Question 4

In pneumatic timers the timing is accomplished by ?

Answer 4

It pushes air through an Orpheus.

Question 5

What are the two basic types of induction motors?

Answer 5

A: wire wound
B: Squirrel Cage

Question 6

Frequent starting and stopping a motor is called ?

Answer 6

Jogging

Question 7

_____________ is the difference between the speed of rotational field and the actual rotation of the motor.?

Answer 7

Slip.

Question 8

A stationary part of a magnetic starter is called the ________ And the moving part is _________?

Answer 8

A: Magnetic Assembly
B: Armature Assembly

Question 9

The current that a motor draws on start up is ______ to ________ times as normal operating current?

Answer 9

Five - Seven

Question 10

Manufacturers sometimes give a __________ _________ on the name plate?

Answer 10

Service Factors

Question 11

When a motor is first started , the current it draws is called _______ or _______ current?

Answer 11

A: In a rush
B: Locked Rotor

Question 12

The temperature of the air that surrounds you or the enclosed is called what?

Answer 12

Ambient Temp

Question 13

2 types of starters are ___________, and ____________?

Answer 13

A: Magnetic
B: Manual

Question 14

What is the manual starter switch called?

Answer 14

Drump switch

Question 15

Manual starters have low voltage _________ only?

Answer 15

Release.

Question 16

Magnetic starters have low voltage _______?

Answer 16

Protection

Question 17

Excessive noise can be caused by a broken _________?

Answer 17

Shading Coil

Question 18

A/C coil should always be connected in ________ as opposed to series.

Answer 18

Parallel

Question 19

Fuses are for _______ __________ only

Answer 19

Short Circuit

Question 20

Unlike fuses overload relays are ??-

Answer 20

Reusable

Question 21

Overload relays can be classified as ___________ or _______

Answer 21

Magnetic Thermal

Question 22

Two class of thermal overloads are ?

Answer 22

Bimetalic Melting Alloy

Question 23

Another name for a melting alloy is a __________?

Answer 23

Solder Pot.

Question 24

A 3 wire control system uses __________ or ________

Answer 24

A: Push Button
B: Momentary Contacter

Question 25

Control transformer operates at __________ voltage on secondary,____________ and the other is _____?

Answer 25

A: 120
B: Grounded
C: Hot

Question 26

A pilot device is operated by________ means?

Answer 26

Mechanical means

Question 27

The holding circuit interlock (seal in ) contact is wired and is parallel to the start button, is used in ___________ wire control systems

Answer 27

3

Question 28

The ____________ usually has the highest voltage and current.

Answer 28

The power section

Question 29

_____________ is when a motor is stopped very rapidly by reversing the rotation… ( is used in a 3 wire)

Answer 29

Plugging

Question 30

What drawing shows all the parts as closely as possibly is called a ___________ .

Answer 30

Wiring Diagram