Book #9

Question 1

Which voltage value does a DC voltmeter read?

Answer 1

Average value

Question 2

When testing an unmarked step down transformer using an ohmmeter the:

Answer 2

Secondary winding will have the lower resistance

Question 3

In a commercial unit, if half the lights suddenly go bright and the other half go very dim, what is the probable cause?

Answer 3

Broken and faulty neutral

Question 4

When installing electrical equipment using scaffolding 10m high, what is required?

Answer 4

Safety fall-arrest harness

Question 5

When installing a short-delay timer on a fridge compressor, what is the timers purpose?

Answer 5

Control the duty cycle

Question 6

How is voltage controlled while maintaining the frequency of an ac generator?

Answer 6

Change the speed of the prime mover

Question 7

How do you increase speed of a three phase alternator?

Answer 7

Increase the prime mover

Question 8

Which instrument is used to check di-electric stress of a high voltage cable after installing a stress cone?

Answer 8

Hi-pot

Question 9

When installing a motor in a high ambient temperature room, what type of overload protection is required?

Answer 9

Magnetic

Question 10

Which is not a common method of starting polyphase squirrel-cage induction motors?

Answer 10

Capacitive starting

Question 11

Which is a common ferrous material?

Answer 11

Steel

Question 12

The shunt winding of a cumulative motor allows for constant-speed control by using:

Answer 12

Smaller wire with many turns

Question 13

An AC three-phase wound rotor induction motor has:

Answer 13

High starting torque and low starting current

Question 14

What is the proper angle for setting up a portable extension ladder?

Answer 14

1 foot out for every 4 feet up

Question 15

The range of a ammeter may be extended by the use of a:

Answer 15

shunt in parallel

Question 16

The programming of an automated system will drop out all non-critical loads:

Answer 16

Upon loss of voltage

Question 17

What is the minimum length of the test when performing a cable hi-potting test using 500v DC?

Answer 17

60s

Question 18

Carbon deposits are found on some electrical contacts during troubleshooting. what does this indicate?

Answer 18

Contacts have been subject to arching

Question 19

What does the interrupting rating of a circuit breaker indicate?

Answer 19

The maximum short circuit condition the circuit breaker can interrupt safely

Question 20

In a DC machine, where shall the brushes be located to minimize armature reaction?

Answer 20

Electrical neutral plane

Question 21

When equipment is not guarded by locked doors, elevation or other means, then it shall be considered

Answer 21

Accessible

Question 22

When a thermostat calls for heat in a hot water heating system within an apartment, it is in direct control of the:

Answer 22

Zone valve

Question 23

When terminating a high voltage stress cone, what type of terminal lug is required?

Answer 23

Barrel lug

Question 24

When does an automated building management system shed non-critical loads?

Answer 24

When the system reaches a preset maximum amount of load

Question 25

When a motor needs to be replaced, what will be used to determine the physical size of the new motor?

Answer 25

Frame

Question 26

Upon loss of voltage in one phase to a UPS system, the disconnecting means shall:

Answer 26

Automatically disconnect all phases from the interconnected system

Question 27

A nylon sling becomes frayed. what you should you do?

Answer 27

Destroy the sling

Question 28

When a belt breaks in a four belt “V” configuration, what should you do?

Answer 28

Replace with match set of belts

Question 29

Which of the following electrical systems require ground fault detection

Answer 29

3-phase, 600v

Question 30

What is the purpose of reduced voltage starting for a DC motor?

Answer 30

Decrease current in the armature windings