CE basic ch.6 Flashcards
The noise levels of generators sized 5Kw to 200 Kw range from how many decibels from 25 feet?
25 dBa- 93 dBa
Single hearing protection is needed for noise less than how many dBa?
84 dBa
Double hearing protection is needed for noise levels greater than how many dBa?
104 dBa
Generators must not be closer than how man feet to a load because of noise,fire hazard, and air circulation?
25Ft
A generator set should not be operated while inclined more than how many degrees from level?
15 degrees
The annual load factor of a well operated active base should be 50% or more with a power factor of what percent or higher?
80%
Practically all general-purpose lighting in the U.S and at U.S overseas bases is how many volts?
120V
What is the sum of the rated capacities of all electrical appliances, lamps, motors, and so on connected to the wiring of the system?
Connected load
What is the ratio between the actual maximum demand and the connected load called?
Demand factor
Shelters should have additional windows or doors installed in localities where the summer temperatures exceed what temperature at any time?
80°F
Exhaust piping inside a building has to Be covered with insulation capable of withstanding a temperature of how many degrees?
1500°F
A ground rod must have a minimum diameter of 5/8 inches if solid or what size of pipe?
3/4 inches
A ground plate must have a minimum area of how many square feet and, where practical, be embedded below the permanent moisture level?
2
The National Electrical Code states that a single electrode consisting of a rod, pipe, or plate that does not have resistance to ground of how many ohms or less will be augmented by additional electrodes?
25
All electrical generators operating at how many volts or less must be solidly grounded?
600V
A ground rod has to have a minimum diameter of 5/8 inch if solid and 3/4 inch if pipe, and it has to be driven to a minimum of how many feet?
8 ft
Trenches should be deep enough to bury cables at least 18 inches (how many inches in traffic areas and under roadways) below the surface of the ground to prevent disturbance of the cable by frost or subsequent surface digging?
24
Watches should be avoided that exceed how many hours unless emergency conditions dictate their use?
8 hours
What is a complete daily record of the operating hours and conditions of the generator set?
Station log
The engine on generator sets should not be cranked in excess of how many seconds at a time?
15 seconds
How much time should the starter on generator sets have to cool between cranking?
3 minutes
What is a ratio, percentage, relationship between watts (true power) of a load and the product of volts and amperes (apparent power) necessary to supply the load?
Power factor
Electrolytes must never exceed what temperature when being placed in dry charged cells?
90°F
What is a routine charge given according to the battery name plate data during the ordinary cycle of operation to restore the battery to its charged condition?
Normal charge
