Power Generation Flashcards
In accordance with the NEC what is required for emergency and standby electrical systems?
Kept completely separated from other electrical systems
Which of the following must comply with electrical safety standards and codes?
Cost
Manpower
Design
Design
Generators are not permitted to be closer than how many feet form the load?
25 feet (7.6 meters)
“Ratio of average to peak power” best describes which factor?
Annual load
Historically, all general purpose lighting power used in overseas United States bases in what voltage?
120
AC motors above 5 horsepower operate satisfactorily in what voltage systems?
208 or 240
The combination of power and light circuits will be accomplished by the use of which of the following voltage systems?
208 to 240
Which of the following is not a unit of measurement associated with electrical loads?
Inductance
Kilowatts
Amperes
Kilovoltamperes
Inductance
The ratio between the actual maximum demand and the connected load is called what?
Demand factor
Which NEC article provides the requirements for determine demand factors?
Article 220
What is the first step when deleting a suitable site for a generator?
Study plot plan of area
If a level dry area can not be found, what should be done?
Place generator on planks or logs for suitable base foundation
If exhaust piping installation required loops in the system, what must be done?
Install drain cock at lowest point of the system
Exhaust piping insulation located inside A structure must be capable to withstand what maximum amount of temperature?
1500 F
What is the minimum AWG size utilized with the ground terminal wire?
6
What is the primary reason for the voltage changeover board?
Permits reconnection of generators phase windings
What is the output of the voltage changeover board of connected in series?
240/416
What is the prefers material used for ground in an underground metallic water piping systems?
A metal driven rod
What is the minimum diameter of a ground rod if manufactured out of piping?
3/4 inch
What is the minimum depth that a ground rod must be driven into the ground?
8
The ground lead utilized with the ground rod is manufactured out of what type of material?
Copper
The resistance of the soil used to implant a ground rod is dependent upon which of the following factors?
Chemical composition of soil
Depth of ground rod
Moisture content
Acidity of soil
Moisture content
What is one of the best means of reducing the resistance to ground?
Use of additional rods
Load cables are connected in which order? ;
L0, L3, L2, and L1
Where is the voltage changeover board located?
Directly above the load thermal board
When multiple rod, pipe, and or plate electrodes are installed, they are required to be no less than how many feet?
6
If the conductor is too small to carry the current demanded by the load what kind of fault might occur?
Open circuit
The voltage drop should not exceed what percentage for lighting loads?
3 percent
When selecting a feeder conductor capable, what carrying percentage of rated generator amperes should be selected to eliminate voltage drop problems?
150 percent
Wire placed underground should be manufactured out of what type of material?
Direct burial, rubber jacketed cable
How long is a trench dug for cable laying in a traffic area?
24 inches
What is your primary purpose as a generator watch?
Produce power.
Which of the following is not a characteristic built into navel electrical installations?
Cost effectiveness
Simplicity
Ruggedness
Flexibility
Cost effectiveness
What is done first prior to starting the generator?
Conduct the prestart checklist in sequence.
Before starting the set the first time, what needs to be verified complete?
Preventive maintenance checks
When are log readings conducted on a running generator?
Every hour
Which of the following is one of the checks conducted?
Coolant level when generator running
Vibration assessment
Hydraulic pressures
Exhaust gas readings
Coolant level when generator running
What is the significance of hearing unusual sounds emitting from generator?
Indication of malfunction
If the load of a generator becomes to large to handle, what actions should be taken?
Add another generator in parallel
Before two generators can be paralleled, which of the following conditions must be met?
Both frequencies must be within 10 percent
Both voltages must be within 25 volts
Both power factors need to be matched
Both terminal voltages have to be equal
Both terminal voltages have to be equal
What are two types of governor operations?
Isochronous and speed droop
When a second machine is utilized, what is the name of this machine?
Slave
When paralleling in a droop mode, the governor of one set must be in what position?
Isochronous
What is indicated if the if the synchronizing lights blink on and off simultaneously?
Voltages sequence of two machines are in phase
What prevents the operator from paralleling the generators if all conditions are not met?
Permissive paralleling relay
All 5kw through 750kw generator sets are equipped with what types of batteries?
Dry charged, less the electrolyte
The 60kw generator is equipped with how many batteries?
2
The electrolyte placed in a cell should be between which of the following temperature ranges?
60 F to 95 F
How long after electrolyte is added does the battery need to cool down?
1 hour
What type of charge is defined as restoration of a the battery to its charges condition during cycle of operation?
Normal
What type of charge is defined as a charge to remove sulfate from the plates?
Equalizing
What type of charge is defined as the commenced as a higher rate and may be detrimental to the battery?
Fast charge
At what electrolyte temperature will you stop the charge to Allow the battery to cool down?
110 F
Never allow the electrolyte temperature to get past what temperature reading?
115 F
What instrument is use to measure the active ingredients in the electrolyte?
Hydrometer
What is defined as the ratio of the weight of the electrolyte to the weight of the same volume of Pure water?
Specific gravity
What is disposition of the sample taken with electrolyte?
Return to battery cell
Which fluid requires a level check prior to starting a generator set?
Crankcase oil
Coolant level needs to be within how many inches of the top of the radiator?
2 inches
The day tank permits how many minutes of engine operation?
5 minutes
To what piece of equipment are the muffler and the exhaust pipe connected?
Turbocharger exhaust elbow
What is the primary purpose of the muffler?
Reduces engine exhaust noise
What device is utilized to compare the phase sequence of a three phase generator?
Phase sequence indicator
Panel board are accessible through which side of the enclosure?
Front
Which of the following is not a category of maintenance associated with power plant maintenance?
Manufacture
What are two types of organizational maintenance?
Operator and preventive
Whalen using compressed air, what pressure should not be exceeded?
30 psig
What’s does the TQG-B model generator have that is not installed on the TGQ-A model?
Digital control system
When Conducting inspection of the TGQ-B generator, where does the inspection start?
Rear
When is the operator made aware when there is a problem with the air cleaner assembly?
Restriction indicator pops up
What receptacle is used to connect machines of the same size and model number?
Paralleling
What voltage is associated with the convenience receptacle?
120VAC
What is the purpose if the dead crank switch?
Allow engine turn over without starting
What piece of equipment regulates fuel amounts that enter the engine to maintain speed?
Actuater
What is used to monitor engine speed on the governor control unit ?
Magnetic pickup
What voltage batteries are associated with the TQG-B model generator?
12 VDC
What is the NATO slave receptacle used for?
Jump starting units from any 24VDC starting systems
The reconnection board allows reconfiguration from 120 volts to what voltage low wye setup?
208 volts
Where does the exhaust exit TGQ-B generator?
Top
Which of the following pieces of equipment is not driven by the fan belt?
Fuel pump
Over current protection of the alternator is provided by a inline fuse rated at what amperage?
30 amps
How many checklist are associated with the TQG-B generator?
4
What is the status of the generator if one of he enclosure doors does not shut?
Deadlined
What is amperage rating of the DC power control fuse?
10 amps
What is the position of the frequency selection switch if utilizing NATO power?
50 hertz
When starting the generator how long is the engine control switch I the start position?
15 seconds
How long is the generator allowed to warm up prior to connect on a load?
For 5 minutes
The noise levels of generators sized from 5KW to 200KW ranged from how many decibels at 25 ft?
77 dBA to 93 dBA
Single hearing protection is needed for noise less than how many dBA?
84
Double hearing protection is needed for noise levels greater than how many dBa?
104
Generators must not be closer than how many feet to a load because of noise, fire hazard, and air circulation?
25 feet
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 percent or more with a power factor of what percent or higher?
80 percent
Practically all general purpose lighting in the United States and at United States overseas bases is how many Volts?
120
What is the sum of the rated capacities of all electrical appliances, lamps, motors, and so on, connects to the wiring of the system?
Connected load
What is the ratio between the actual maximum demand and the connects load called?
Demand factor
Shelters should have additional Windows or doors installed in localities where the summer temperatures exceed what temperature at any time?
80F
Exhaust piping insides building has to be covered with insulation capable of with standing a temperature of how many degrees?
1500F
A ground rod must have a minimum diameter of 5/8 inches of solid or what size if it is 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
All electrical generators operating at how many volts or less must be solidly grounded?
600 volts
A ground rod has to have a minimum diameter of 5/8 inch if solid and 3/4 if pipe, and it has to be drive to a minimum of how many feet?
8 feet
Watches should be avoided that exceed how many hours unless a emergency conditions dictate their use?
8 hours
What is a complete Daily record of he operating hours and conditions of a generator set?
Station log
The engine on the generator 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 mins
Electrolytes must never exceed what temperature when being placed in dry cells?
90 F
What breaks or interrupts the circuit anytime there is a short circuit or overload condition in the old cables?
Circuit breaker
What are three major categories o Maintenance?
Depot, intermediate, and organizational
What type of maintenance includes the hourly, Daily, and weekly maintenance requirements recommended in the manufactures literature?
Operator
What measures the oil level in the engine drain pan?
Oil dipstick
The generator must member within hoe many feet of any paralleled generator set and within how many feet of any auxiliary fuel supply?
25 feet for both
The combined resistance of two rods properly spaced and connected in parallel should increase the resistance compares to one rod?
60 percent
