Book #3 Flashcards
When installing a switched receptacle in a residential bedroom, what must be done so the receptacle can also be counted as a wall outlet?
Constant power on the top socket
When the liquid level is down in a battery, what type of liquid do you add?
Distilled water
On a single-phase split-phase induction motor, the centrifugal switch disconnects the start winding from the circuit at what percentage of the full speed of the motor
75%
What characteristics will a capacitor-start motor have?
Low inrush current and high starting torque
In a DC circuit, Voltage and Current are:
Directly proportional
Where do you find the maximum amount of area a smoke detector covers?
The manufacturer
During a routine maintenance check of a wye connected 3-phase motor, you discover when you take individual amp reading of each phase that one phase is drawing 7 amps more than the other. what is the probable cause
Shorted winding
What is the main reason for lubricating bearings in a motor?
Reduce heating
What is the proper procedure to follow when energizing an oil-filled transformer for the first time?
Open the secondary and energize the primary
When wiring a control system, how shall normally closed devices be wired?
in series
What is the installation requirements for single conductor mineral-insulated cables carrying over 425A?
Grouped together to minimize induced sheath currents
Most AC voltmeters and ammeters are calibrated in?
Root-means-square values
The hypotenuse of the power triangle represents:
Apparent power
The primary purpose of a megger is to measure:
Resistance
A Split-phase AC motor is made self starting by the addition of:
Starting winding
The primary of a current transformer is always connected in:
Parallel with the load
The primary hazards when handling and charging batteries is/are due to the danger of
Acid burns and explosions
“Trip-free” as applied to electrical terms means:
Mechanism which makes it impossible to hold contact close against overload
A motor can be operated as a generator when the motor needs to be slowed or stopped quickly. what is this type of DC motor control called?
Dynamic Braking
The purpose of electrical interlocks in a reversing magnetic starter are:
To prevent mote than one coil from being energized at the same time
Limit switches are usually used to limit:
Travel
A dual voltage single phase motor must have:
Two running windings
A dual voltage AC motor operating on the higher voltage will draw:
Less current than on the lower voltage
A single phase motor has a phase to ground fault, a possible cause is:
The centrifugal switch is touching the frame
Solid-state inverters are used to:
Change DC to AC
AC squirrel-cage induction motors can have their speed controlled through electronic equipment that controls the?
Frequency
The part of an AC to DC power supply that keeps the output voltage constant despite load changes in current is the:
Voltage regulator
How is the circuit of a loaded voltage divider connected?
Series parallel
unloaded = series
Which type of switch is installed to only separate the circuit from its source of supply and should never be opened or closed under load?
Isolating switch
When replacing a shackle pin on a hydraulic bender, why shouldn’t you use a threaded bolt
Bolt may not be strong enough
A growler cannot locate which of the following faults in a motor winding
Reverse Coils
W.H.I.M.I.S is an abbreviation for?
Workplace hazardous materials information system
M.S.D.S is an abbreviation for:
Material Safety Data Sheets
What is required for personnel to work in an area where chemicals are in use?
WHIMIS qualification and availability of MSDS information
According to WHIMIS classification, control products are divided into how many classes?
6
When you transfer hazardous materials to another container, you must:
Create a workplace label and affix it to the new container
If you are exposed continuously to a toxic material:
You may not be have a health problem for several years
When chemicals arrive on site, what needs to be done with the MSDS sheet?
WHIMIS folder in the general office on site
How long is MSDS valid for?
3 years
What are the two types of labels prescribed by WHIMIS
Workplace label and supplier label
Battery acid is an example of:
Class E: corrosive materials
