Book #6

Question 1

What three items or variables are synchronized when connecting two generators in parallel to supply an electrical system?

Answer 1

Frequency, impedance, voltage

Question 2

How is rigid pvc conduit terminated into a coupling or connector?

Answer 2

Using solvent cement

Question 3

A DC motor obtains it supply from a bridge rectifier and a solid-state starter, if one diode of the bridge rectifier opens, what would happen to the moter if running under full load?

Answer 3

Motor would stall

Question 4

A motor functioning properly through a variable frequency drive. it suddenly stops. where is the best location to lock-off this motor

Answer 4

The motor disconnect

Question 5

In a cumulative compound motor, in comparison to the series field windings, the shunt field windings are made with:

Answer 5

Many turns of smaller wire

Question 6

In a DC Motor operating with varying load, what can be done to correct armature correction?

Answer 6

Using interpoles and commutating windings connected in series with the armature current

Question 7

What is the purpose of fins on a power amplifier?

Answer 7

Provide a means for heat dissipation

Question 8

What is the simplest way of testing thermit welds?

Answer 8

Tap the weld

Question 9

When a squirrel cage induction motor is drawing more current than the nameplate full load current, what two conditions could be causing the increased current?

Answer 9

Low system voltage and excessive mechanical load

Question 10

You are troubleshooting electrical contacts and you observe there is blue coloring on the contacts. what does this indicate?

Answer 10

Contacts have been subject to excessive heating

Question 11

How would you describe harmonics in an electrical distribution system?

Answer 11

Distortion of voltage and current waveforms

Question 12

An oil-filled transformer develops moisture in the oil. what effect will this have?

Answer 12

Bad dielectric

Question 13

A ladder this is found to be defective should be:

Answer 13

Marked or tagged and taken out of service immediatly

Question 14

What function does a zero sequence filter do in a 120/208 v, three phase electrical system

Answer 14

Reduces unbalanced neutral currents

Question 15

What safety procedure must you follow prior to using any protective equipment before each use?

Answer 15

Inspect equipment for any obvious defects or damage

Question 16

To ensure that a rope grab is correctly installed, give the rope a tug in the direction of a fall. if installed correctly, the rope grab should:

Answer 16

Engage and stop

Question 17

How many connection points are required on a fire detector for a supervised fire alarm system?

Answer 17

4

Question 18

The electrician is to check an NI/CAD battery installation. which method should the electrician use?

Answer 18

Check the voltage while it is under load

Question 19

What should you immediately do after locking out a circuit?

Answer 19

Check to ensure zero potential

Question 20

What are the three critical items for high voltage O/C that must be checked?

Answer 20

Type, rating, and interupting capacity of the device

Question 21

What type of flux would you use for electronic soldering?

Answer 21

Resin Core

Question 22

A plant electrician is called out to repair a broken luminaire in a storage area. after the repair is completed what should his next step be?

Answer 22

Record the repair in electrical shop log