What is maximum permitted load of a 15 A branch circuit?
A. 10 A
B. 15 A
C. 12 A
D. 8 A
C. 12 A
Where a feeder supplies continuous load or any combination of continuous and non-continuous load. The rating of the overcurrent device shall NOT be less than the non-continuous load plus___ of the continuous load.
A. 125 %
B. 110 %
C. 150 %
D. 175 %
A. 125 %
The circuit supplying an autotransformer type dimmer shall NOT exceed ___ between conductors.
A. 240 V
B. 250 V
C. 230 V
D. 200 V
C. 230 V
A spark occurring between nearby metallic objects or from such objects to the lightning protection system or to ground.
A. Flashover
B. Sideflash
C. Sparkover
D. Discharge
B. Sideflash
Covers for boxes shall be permanently marked. The marking shall be on the outside of the box using the block type letters at least ___ in height.
A. 10 mm
B. 12 mm
C. 15 mm
D. 20 mm
B. 12 mm
Where circuit breakers are used to protect the primary side of a transformer over 600 V nominal, their continuous current rating shall NOT exceed ___ of the rated primary current.
A. 250 %
B. 300 %
C. 175 %
D. 200 %
B. 300 %
The lowest standard size of disconnect is ___.
A. 20 A
B. 30 A
C. 60 A
D. 15 A
B. 30 A
The primary winding of a step down transformer shall be protected on the primary side by an overcurrent device rated NOT more than a certain percentage of the primary current. Which is this percentage?
A. 110%
B. 125%
C. 80%
D. 150%
B. 125%
Where conductors are used as the disconnecting means for fuses, an individually externally operable switch, such as tumbler switch for the control of each contactor shall be located at a distance of not more than ___ from the contactor.
A. 1,500 mm
B. 1,800 mm
C. 2,000 mm
D. 2,400 mm
B. 1,800 mm
No electrical installation, alteration and or addition shall be connected or reconnected to any power supply or any other sources of electrical energy without ___.
A. an electrical permit
B. an application for inspection
C. certificate of payment
D. certificate of final inspection
D. certificate of final inspection
The minimum size of branch circuit capacity to supply laundry receptacle outlets shall be ___.
A. 20 A
B. 15 A
C. 25 A
D. 30 A
A. 20 A
Each of three 305 mm2 TW copper conductors are in a conduit has an ampacity of 20 A. If there will be six of them in the conduit, what will be the ampacity of each conductor?
A. 12 A
B. 20 A
C. 16 A
D. 15 A
C. 16 A
Branch circuit conductors supplying a single motor-compressor shall have an ampacity not less than ___ of either the motor-compressor rated load or the branch circuit selection current, whichever is larger.
A. 100 %
B. 125 %
C. 115 %
D. 130 %
B. 125 %
What size of branch circuit is required to supply a fixed lighting load of 21.5 A used at continuous duty?
A. 30 A
B. 20 A
C. 40 A
D. 25 A
A. 30 A
Exposed energized parts of motors and controllers operating at ___ volts or more between terminals shall be guarded against accidental contact by enclosure.
A. 50
B. 30
C. 40
D. 60
A. 50
To improve the insulation resistance of a motor, it is first cleaned, washed, varnished then baked. Which is very economical and effective method of baking particularly the inside coils of a large motor?
A. Putting incandescent lamps around the winding and cover
B. Hanging resistor strips inside the core and cover
C. Putting it inside the baking oven and control the oven temperature
D. Connecting the terminals to a variable low voltage supply and increase the baking current gradually until the desired baking temperature is attained
C. Putting it inside the baking oven and control the oven temperature
___ includes any switch or device normally used to start and stop a motor by making and breaking the motor circuit current.
A. Controller
B. Rheostat
C. Autotransformer
D. Double pole double throw switch
A. Controller
No conductors larger than ___ shall be installed in cellular metal floor raceways.
A. 100 mm2
B. 38 mm2
C. 50 mm2
D. 14 mm2
C. 50 mm2
In mobile homes, receptacle outlets shall not be installed within ___ of a shower or bathtub space.
A. 760 mm
B. 600 mm
C. 500 mm
D. 1,000 mm
A. 760 mm
