Power Tech Final Exam Graded A+
Are IMC and rigid interchangeable? - ANSWER-Yes, they are considered
interchangeable in most applications.
How are power supplies represented in a ladder diagram? - ANSWER-By the diagram's
two vertical lines.
How are the pipe jaws of a bench vise designed? - ANSWER-They are made in the
form of a V to grasp all around the pipe.
How are wires fed through conduit? - ANSWER-By hand or using a fish tape.
How can all conduit piping be cut? - ANSWER-Easily with a hacksaw fitted with a fine
toothed blade.
How do compression connectors work? - ANSWER-They use a split ring that grabs the
conduit as a nut is tightened.
How do ladder diagrams with multiple pages indicate navigation? - ANSWER-They use
arrows and notes to indicate the previous and next pages.
How do you size the circuit protection of a motor? - ANSWER-Multiply the rated FLA by
125%.
How does the length of a conductor affect resistance? - ANSWER-The greater the
length, the greater the resistance and line/voltage drop
How does the sight gage operate? - ANSWER-By looking straight down at the indicator
and comparing it to the five calibrated bending degree marks.
How is operation verification of a motor control system performed? - ANSWER-By
verifying wiring connections and system operations.
How is the overall offset measured? - ANSWER-It is the distance measured from the
top or bottom of an offset parallel to the opposite side of the remaining parallel.
How many busbars does the busway of a delta type power system contain? -
ANSWER-Three busbars
How many layers of tape should be used when taping motor leads with wire rated 450
VAC? - ANSWER-Five layers of tape.
How much more expensive can it be to use connectors to change the direction of
conduit for larger jobs? - ANSWER-About 40% more expensive than bending it.
, How must electrical wiring that runs in exposed locations be protected? - ANSWER-By
conduit.
How must every panel and many external components in an electrical control system be
grounded? - ANSWER-By connecting ground wire to the main power ground conductor.
How must wires run between the control panel and operator station? - ANSWER-They
must enter and exit the panels through terminal blocks.
How should an overcurrent protection device be sized for a motor control circuit with a
motor FLA of 20 amps? - ANSWER-It should be sized for at least 25 amps.
What are anchors used for in wiring? - ANSWER-To bundle wire along the back of a
panel.
What are conductors? - ANSWER-Wires, cables, or busbars used to deliver current to a
load.
What are cross-referencing numbers used for on ladder diagrams? - ANSWER-To
identify the line number that contains the output coil's contact.
What are disconnects? - ANSWER-Devices that cut power to the load.
What are examples of loads supplied by a wiring system? - ANSWER-Motors, lights,
and machines.
What are portable band saws used for? - ANSWER-To cut all types of conduit as well
as other materials.
What are the four primary components of a ladder diagram? - ANSWER-Power supply,
input devices, output devices, and conductors.
What are the prongs of a hacksaw used for? - ANSWER-To hold the blade in the frame.
What are the three main types of pipe vises? - ANSWER-Yoke vise, chain vise, and
bench vise.
What are the three types of conduit straps? - ANSWER-One hole, two hole, and barbed
straps.
What are the two methods by which circuit breakers can be tripped? - ANSWER-
Thermally and magnetically triggered.
What are the two types of flexible conduit? - ANSWER-Metallic (with internal flexible
metal ribs) and non-metallic (without internal flexible metal ribs).
Are IMC and rigid interchangeable? - ANSWER-Yes, they are considered
interchangeable in most applications.
How are power supplies represented in a ladder diagram? - ANSWER-By the diagram's
two vertical lines.
How are the pipe jaws of a bench vise designed? - ANSWER-They are made in the
form of a V to grasp all around the pipe.
How are wires fed through conduit? - ANSWER-By hand or using a fish tape.
How can all conduit piping be cut? - ANSWER-Easily with a hacksaw fitted with a fine
toothed blade.
How do compression connectors work? - ANSWER-They use a split ring that grabs the
conduit as a nut is tightened.
How do ladder diagrams with multiple pages indicate navigation? - ANSWER-They use
arrows and notes to indicate the previous and next pages.
How do you size the circuit protection of a motor? - ANSWER-Multiply the rated FLA by
125%.
How does the length of a conductor affect resistance? - ANSWER-The greater the
length, the greater the resistance and line/voltage drop
How does the sight gage operate? - ANSWER-By looking straight down at the indicator
and comparing it to the five calibrated bending degree marks.
How is operation verification of a motor control system performed? - ANSWER-By
verifying wiring connections and system operations.
How is the overall offset measured? - ANSWER-It is the distance measured from the
top or bottom of an offset parallel to the opposite side of the remaining parallel.
How many busbars does the busway of a delta type power system contain? -
ANSWER-Three busbars
How many layers of tape should be used when taping motor leads with wire rated 450
VAC? - ANSWER-Five layers of tape.
How much more expensive can it be to use connectors to change the direction of
conduit for larger jobs? - ANSWER-About 40% more expensive than bending it.
, How must electrical wiring that runs in exposed locations be protected? - ANSWER-By
conduit.
How must every panel and many external components in an electrical control system be
grounded? - ANSWER-By connecting ground wire to the main power ground conductor.
How must wires run between the control panel and operator station? - ANSWER-They
must enter and exit the panels through terminal blocks.
How should an overcurrent protection device be sized for a motor control circuit with a
motor FLA of 20 amps? - ANSWER-It should be sized for at least 25 amps.
What are anchors used for in wiring? - ANSWER-To bundle wire along the back of a
panel.
What are conductors? - ANSWER-Wires, cables, or busbars used to deliver current to a
load.
What are cross-referencing numbers used for on ladder diagrams? - ANSWER-To
identify the line number that contains the output coil's contact.
What are disconnects? - ANSWER-Devices that cut power to the load.
What are examples of loads supplied by a wiring system? - ANSWER-Motors, lights,
and machines.
What are portable band saws used for? - ANSWER-To cut all types of conduit as well
as other materials.
What are the four primary components of a ladder diagram? - ANSWER-Power supply,
input devices, output devices, and conductors.
What are the prongs of a hacksaw used for? - ANSWER-To hold the blade in the frame.
What are the three main types of pipe vises? - ANSWER-Yoke vise, chain vise, and
bench vise.
What are the three types of conduit straps? - ANSWER-One hole, two hole, and barbed
straps.
What are the two methods by which circuit breakers can be tripped? - ANSWER-
Thermally and magnetically triggered.
What are the two types of flexible conduit? - ANSWER-Metallic (with internal flexible
metal ribs) and non-metallic (without internal flexible metal ribs).
