B2U4 Flashcards
(32 cards)
What are three things that cause static electricity to form?
(1) it can result form friction between small particles
(2) It can form from electrostatic induction by a charged object.
(3) It also comes from contact and separation of two substances, one or both of which are nonconductive.
How much of a static charge can ignite gasoline fumes?
1,500 volts
Why is it necessary to use the ground rod-driving adapter?
Without it you will damage the top of the ground rod making it difficult to place a ground connector on it and making it impossible to screw in another coupler to allow another ground rod to be installed
Where is a star ground configuration particularly useful?
Mobile sites
What do grid electrodes consist of?
Buried wires joined together to form a network of squares.
How deep must plate electrodes be buried?
4 to 8 feet below grade.
Why do you bond the generator’s neutral and ground?
To provide a path for electricity to ground in the event of a fault.
When are the ground and neutral bonded?
(1) Prime power generation.
(2) Standby with a switched neutral.
What can a loose connection on a generator ground cause?
This can cause corrosion, which can lead to higher resistance.
How are adjustments made to commercial power monitoring?
External points on the controller itself. On others, this is accomplished through a computer program, where a laptop is connected and the adjustments by reprogramming the controller.
What type of contacts are used for the generator start control?
Normally open or normally closed set of contacts.
What control sends a signal to transfer the load to the generator?
Transfer control
What control sends a signal to transfer the load to commercial power?
Retransfer control
What allows the generator to cool down before shutdown?
Engine shutdown timer
How do you perform a functional test of an ATS?
Going to the power source for the transfer panel and opening it.
When would you adjust the retransfer time delay?
In locations where power is very unstable during certain parts of the day and you want the generator to run that entire time.
When replacing components, what must you do before performing the maintenance?
Ensure that all power is turned off to the panel.
What are four considerations when determining the compatibility of an ATS?
(1) Location.
(2) Voltage rating.
(3) Amperage rating.
(4) Poles or phases.
When installing an ATS, what must you do once you restore commercial power?
A full test of the system.
In what type of weather can a static charge can be most hazardous?
a. Arid, hot weather.
b. Dry, cold weather.
c. Wet, cool weather.
d. Humid, warm weather.
B. Dry, cold weather.
At what voltage can static charges ignite gasoline fumes?
a. 1,500.
b. 3,000.
c. 5,000.
d. 10,000.
A. 1500
What function does a static ground serve?
a. To connect all noncurrent carrying metal parts of an electrical system to ground.
b. To provide a path to ground for current from lightning strikes.
c. To provide a path for electricity to ground in the event of a fault.
d. To dissipate or reduce unwanted electrical charges in hazardous areas to ground.
D. To dissipate or reduce unwanted electrical charges in hazardous areas to ground.
What function do equipment grounds serve?
a. To connect all noncurrent carrying metal parts of an electrical system to ground.
b. To provide a path to ground for current from lightning strikes.
c. To provide a path for electricity to ground in the event of a fault.
d. To dissipate or reduce unwanted electrical charges in hazardous areas to ground.
a. To connect all noncurrent carrying metal parts of an electrical system to ground.
When installing a star ground, what is the best approach to lower resistance and reactance at the same time?
a. Use larger conductors.
b. Increase the number of conductors while keeping their lengths short.
c. Decreasing the number of conductors but making them longer.
d. Use small conductors.
b. Increase the number of conductors while keeping their lengths short.
