Developing electrical troubleshooting skills 210

Question 1

Cross referencing to the different location of limit switches in a diagram are provided by

Answer 1

Arrows next to the symbol line numbers

Question 2

A control panel layout shows the

Answer 2

Physical arrangement of a components

Question 3

A sequence of operation

Answer 3

Is used with an elementary diagram

Question 4

Which part of an electrical schematic generally represents the hot conductor?

Answer 4

Left vertical line

Question 5

Which of the following is not typically used to identify conductors in a motor-control circuit?

Answer 5

Colors

Question 6

The actual location and routing of circuits is shown on

Answer 6

Wiring diagram

Question 7

In addition to the locations of lighting and lighting panels, lighting diagrams show the locations of

Answer 7

Telephone outiets

Question 8

On architectural working drawings, an electrician is concerned mainly with the electrical drawings superimpose

Answer 8

Floor plan

Question 9

Which of the following would show where the power-astribution system, ducts, and manholes are located for a manufacturing plant consisting of several buldings?

Answer 9

Plot plan

Question 10

The following symbol represents an _______ outlet in a________

Answer 10

Exit light , wall

Question 11

Which are most affected by overvoltage?

Answer 11

Slow speed motors

Question 12

Maintained start-stop devices provide

Answer 12

only undervoltage release

Question 13

Which of the following provides both overload protection and short-circuit protection in one unit?

Answer 13

Combination motor starter

Question 14

If an electrical machine has several problems, you should correct _______ problem(s) before trying the mach

Answer 14

Only one

Question 15

circuit that provides undervoltage release and has two wires connected to the pilot device that energizes

Answer 15

two-wire control

Question 16

Overvoltage, excessive current and too-frequent operation are possible causes of

Answer 16

burned or short circuit magnet coil

Question 17

When you arrive to troubleshoot a defective machine, the next thing to do after talking to the machine operator

Answer 17

Press the start button

Question 18

In the electronic timing relay, the time-delay assembly is connected in

Answer 18

senes with the relay coil

Question 19

When troubleshooting a starter, if line voltage is present, the problem is probably in the

Answer 19

Pilot circuit

Question 20

The basic tools required for troubleshooting most control relays include a screwdriver, a voltmeter, and (a/an)

Answer 20

circuit tester. grounding

Question 21

Most reversing starters with low-voltage remote pushbuttons are all of the following EXCEPT

Answer 21

mechanically interconnected

Question 22

Adding limit switches to the control circuit of a reversing motor provides

Answer 22

overtravel protection

Question 23

Changing the number of magnetic poles in the stator of a squirrel-cage motor permits the motor to run

Answer 23

at two or more fixed speeds

Question 24

For additional safety, most reversing starters are equipped with both an electrical and mechanical

Answer 24

interlock

Question 25

Which of the following kinds of starters is used to limit the starting torque on certain loads?

Answer 25

Autotransformer

Question 26

A good diode has a resistance that is

Answer 26

low in one direction, high in the other

Question 27

A latched electrical relay is an example of a

Answer 27

device that is stable in both the energized and de-energized conditions

Question 28

In autotransformer input circuits, each input line should be

Answer 28

fused

Question 29

The no-load current in a three-phase rectifier is typically 6 to 10% of the ______ current and usually

Answer 29

Full load

Question 30

A pneumatic shuttle valve is used for operating a conventional pneumatic ______ or electrical relay

Answer 30

Valve

Question 31

The kind of lubrication that should be used in a bearing is determined by the bearing's

Answer 31

maximum operating temperature

Question 32

DC motors and generators have______ which cause special problems not normally found in ac mach

Answer 32

commutators and brushes

Question 33

Commutator overheating is sometimes caused by the direction of rotation of the motor being changed without changing the position of the brushes to the new ______ plane

Answer 33

neutral

Question 34

Worn and damage ball in roller bearings are easily detected by the _______ they produce

Answer 34

Unusual noise

Question 35

Motors that have been flooded with water usually can be savaged provided there's no chemical or ______ were in

Answer 35

oils

Question 36

When testing a three phase delta connection wiring with a compass, the compass will indicate alternating north and south polls when the pole phase

Answer 36

Connected properly

Question 37

Which of the following is not a common cause of mechanical, vibration,

Answer 37

Worn Brushes

Question 38

All of the following are common reasons why a motor makes a noticeable noise when operating except

Answer 38

Too little end play

Question 39

You can measure the current in the leads of a three phase motor with a clamp on Ammeter the continuity with of the motor is tested with

Answer 39

ohmmeter

Question 40

When taking faults in a single phase split phase motor test, both the ______ windings for grounds opened in shorts

Answer 40

Run and start

Question 41

Play light maintenance primarily consist of______ to economize on labor ____ to optimize light levels in space appearance and _____ to correct the abnormalities in operations

Answer 41

Group Relamping , fixture cleaning, troubleshooting

Question 42

NEMA recommend seasoning liner lamps for ____ hr before dimming

Answer 42

12

Question 43

HID lamps require a____ and ____ period

Answer 43

Start up ; restrike

Question 44

The systemic testing of all controls in a building to ensure that they perform and interact properly is known as

Answer 44

commissioning

Question 45

The color temperature of a light produced by a lamp is expressed in degrees

Answer 45

Kelvin

Question 46

When preparing an elementary diagram, you should number all lines with_____ numbers

Answer 46

consecutive

Question 47

One of the best ways to leam about new equipment is to begin troubleshooting

Answer 47

before installation

Question 48

A sequence of operation consists of two elements: a log and a

Answer 48

Graph

Question 49

Most equipment manufacturers adhere to some kind of standard for electrical prints and symbols; the most widely used is the one proposed by

Answer 49

JIC

Question 50

Whenever equipment undergoes circuit changes and/or modifications, make sure that you record the information

Answer 50

On the schematic