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CE1 September exam > CE basic chapter 6 Power generation > Flashcards

CE basic chapter 6 Power generation Flashcards

1
Q

Noise levels of generators sized from 5kw to 200kw?

A

77dBA to 93dBa at 25 feet.

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2
Q

60 KW generator presents what noise levels?

A

84 dBa to 91 Dba

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3
Q

single hearing protection and Double DBAS.

A

84 single

104 double

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4
Q

Generators should not be closer than ___ feet (__ Meters) to a load because of noise, fire hazard, and air circulation.

A

25 feet

7.6 meters

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5
Q

the set must be placed on stable, preferably level, foundation. it should not be operated while inclined more than ___ degrees from level.

A

15 degrees

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6
Q

the site must be within __ Feet of any paralleled generator set and within __ feet of any auxiliary fuel supply.

A

25 feet

25 feet

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7
Q

The annual load factor of a well-operated active base should be __ percent or more with a power factor of __ percent or higher.

A

50

80

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8
Q

Demand factor Formula

A

Connected load x maximum demand

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9
Q

what is a major factors when installing generator units inside a building?

A

ventilation

doors and window should be installed in localities where the summer temperatures exceed 80F at any time.

working space for maintenance

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10
Q

under no circumstance should what gas be allowed to build up in room?

A

carbon monoxide

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11
Q

voltage change over board on generator facilitates conversion to?

A

120/208 or 240/416 output voltage.

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12
Q

In parallel the output is?

A

120/208

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13
Q

in series the output is?

A

240/416

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14
Q

three types of grounding procedures for generators?

A

An underground metallic water pipping system, a driven metal road, and a buried metal plate

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15
Q

A ground rod must have a minimum diameter of?

A

5/8 inches if solid or 3/4 inches if pipe.

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16
Q

The rod must be driven a minimum depth of?

A

8 feet

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17
Q

A ground plate must have a minimum area of __ square feet and, where practical, be be embedded below moisture levels.

A

2 square feet and buried a minimum depth of 2 1/2 feet

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18
Q

the ground lead must be at least No. _ Awg copper wire.

A

6 AWG

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19
Q

the nec states that single electrode consisting of a rod, pipe, or plate that does not have a resistance to ground of __ ohms

A

25 ohms

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20
Q

what methods can you use if ground resistances are to high?

A

Using additional rods is one of the best means of reducing the resistance to ground

longer rods

treating the soil

chemical treating

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21
Q

voltage drop should not exceed _ percent for power loads, _ percent for lighting loads, or _ percent for combined power and lightening loads.

A

3%
3%
6%

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22
Q

Select a feeder conductor capable of carrying ___ percent of rated generator amperes to eliminate overloading and voltage drop problems.

A

150 %

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23
Q

underground cables should be direct burial, rubber jacketed and buried at least?

A

18 inches deep, 24 inches in traffic areas. After laying cable back fill with soil free of stones, rocks, and so forth.

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24
Q

You should avoid generator watches longer than?

A

8hrs

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25
Single plant operations: what do you set adjust hydraulic governor droop position to?
0
26
operate generator for at least _ mins to warm it up.
5 mins
27
Before 2 Ac generators can be paralleled, the following conditions must be met?
their terminal voltages have to be equal. their frequencies have to be equal. Their voltages have to be in phase.
28
Two types of governor operations?
isochronous and speed droop
29
Master machine must be set to isochronous position or unit position. the governor setting on the slave generator must be set to the ____ position.
parallel
30
60kw gen set is equipped with ___ 12 volt, 100 ampere - hour batteries.
TWO
31
the two batteries are connected in _____
Series
32
A day tank is one of the major components of the fuel system. it has the capacity to permit engine operation for a minimum of __ minutes.
5 mins
33
. Additional doors or windows should be provided in the shelter if the plants are installed in localities where the summer temperatures exceed __°F at any time
80
34
exhaust piping inside the building must be covered with insulation capable of withstanding a temperature of ____ F.
1500.
35
three major categories or levels of maintenance.
the three categories are depot, intermediate, and organizational.
36
Two types of organizational maintenance?
operator and preventive
37
can you parallel a TQG-A and TQG-b?
No
38
Nato receptacle used for?
used for a 24VDC starting system
39
Reconnection Board on TQG-B for low wye and high Wye?
120-208 low wye 240-416 high wye
40
power fuse amp rating?
10 amp
41
How long is the generator allowed to warm up prior to connecting a load?
5 mins
42
When starting the generator, how long is the engine control switch in the start position
15 sec
43
What is the position of the frequency selection switch if utilizing NATO power
50 hz
44
In accordance with the National Electrical Code®, what is required for emergency and standby electrical systems?
Kept completely separated from other electrical systems
45
Which of the following must comply with electrical safety standards and codes?
design
46
Generators are not permitted to be closer than how many feet from the load?
25
47
The following statement, "Ratio of average power to peak power" best describes which of the following factors?
annual load
48
Historically, all general purpose lighting power used in overseas United States bases is what voltage?
120
49
AC motors above 5 horsepower operate satisfactorily in what voltage systems?
208 - 240
50
The combination of power and light circuits will be accomplished by the use of which of the following voltage systems?
208 - 240
51
Which of the following units of measurements are associated with electrical loads?
kilowatts amperes kilovoltamperes
52
The ratio between the actual maximum demand and the connected load is called what??
demand factor
53
Which of the following National Electrical Code® Articles provides the requirements for determining demand factors?
ART 220
54
What is the first step when selecting a suitable site for a generator?
study plot plan of area
55
If a level, dry area can not be found, what should be done?
planks or logs
56
What is the minimum AWG size utilized with the ground terminal wire?
6 awg
57
What is one of the best means of reducing the resistance to ground?
Use of additional rods
58
Load cables are connected in which order?
0 3 2 1
59
Where is the voltage change board located?
above load terminal board
60
When multiple rod, pipe, or plate electrodes are installed, they are required to be no less than how many feet apart?
no less than 6 feet
61
When selecting a feeder conductor, what percentage of rated generator amperes should be selected to eliminate voltage drop problems?
150
62
Wire placed underground should be manufactured out of what type of material?
Direct burial, rubber jacketed cable
63
How deep is a trench dug for cable laying in a traffic area?
24 inches
64
When are log readings conducted on a running generator?
every hour
65
What is the significance of hearing unusual sounds emitting from generator?
malfunction
66
If the load of a generator becomes too large to handle, what actions should be taken?
add another generator in parallel
67
Before two generators can be paralleled, which of the following conditions must be met?
terminal voltages equal frequencies have to be equal their voltages in phase
68
What prevents the operator from paralleling the generators if all conditions are not met?
Permissive paralleling relay
69
All 5 Kw through 750 Kw generator sets are equipped with what types of batteries?
dry charged less electrolyte

CE1 September exam (17 decks)

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