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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
Q

Single plant operations: what do you set adjust hydraulic governor droop position to?

A

0

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26
Q

operate generator for at least _ mins to warm it up.

A

5 mins

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27
Q

Before 2 Ac generators can be paralleled, the following conditions must be met?

A

their terminal voltages have to be equal.

their frequencies have to be equal.

Their voltages have to be in phase.

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28
Q

Two types of governor operations?

A

isochronous and speed droop

29
Q

Master machine must be set to isochronous position or unit position. the governor setting on the slave generator must be set to the ____ position.

A

parallel

30
Q

60kw gen set is equipped with ___ 12 volt, 100 ampere - hour batteries.

A

TWO

31
Q

the two batteries are connected in _____

A

Series

32
Q

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.

A

5 mins

33
Q

. 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

A

80

34
Q

exhaust piping inside the building must be covered with insulation capable of withstanding a temperature of ____ F.

A

1500.

35
Q

three major categories or levels of maintenance.

A

the three categories are depot, intermediate, and organizational.

36
Q

Two types of organizational maintenance?

A

operator and preventive

37
Q

can you parallel a TQG-A and TQG-b?

A

No

38
Q

Nato receptacle used for?

A

used for a 24VDC starting system

39
Q

Reconnection Board on TQG-B for low wye and high Wye?

A

120-208 low wye

240-416 high wye

40
Q

power fuse amp rating?

A

10 amp

41
Q

How long is the generator allowed to warm up prior to connecting a load?

A

5 mins

42
Q

When starting the generator, how long is the engine control switch in the start position

A

15 sec

43
Q

What is the position of the frequency selection switch if utilizing NATO power

A

50 hz

44
Q

In accordance with the National Electrical Code®, what is required for emergency and
standby electrical systems?

A

Kept completely separated from other electrical systems

45
Q

Which of the following must comply with electrical safety standards and codes?

A

design

46
Q

Generators are not permitted to be closer than how many feet from the load?

A

25

47
Q

The following statement, “Ratio of average power to peak power” best describes which of
the following factors?

A

annual load

48
Q

Historically, all general purpose lighting power used in overseas United States bases is
what voltage?

A

120

49
Q

AC motors above 5 horsepower operate satisfactorily in what voltage systems?

A

208 - 240

50
Q

The combination of power and light circuits will be accomplished by the use of which of the
following voltage systems?

A

208 - 240

51
Q

Which of the following units of measurements are associated with electrical loads?

A

kilowatts
amperes
kilovoltamperes

52
Q

The ratio between the actual maximum demand and the connected load is called what??

A

demand factor

53
Q

Which of the following National Electrical Code® Articles provides the requirements for
determining demand factors?

A

ART 220

54
Q

What is the first step when selecting a suitable site for a generator?

A

study plot plan of area

55
Q

If a level, dry area can not be found, what should be done?

A

planks or logs

56
Q

What is the minimum AWG size utilized with the ground terminal wire?

A

6 awg

57
Q

What is one of the best means of reducing the resistance to ground?

A

Use of additional rods

58
Q

Load cables are connected in which order?

A

0 3 2 1

59
Q

Where is the voltage change board located?

A

above load terminal board

60
Q

When multiple rod, pipe, or plate electrodes are installed, they are required to be no less
than how many feet apart?

A

no less than 6 feet

61
Q

When selecting a feeder conductor, what percentage of rated generator amperes should be
selected to eliminate voltage drop problems?

A

150

62
Q

Wire placed underground should be manufactured out of what type of material?

A

Direct burial, rubber jacketed cable

63
Q

How deep is a trench dug for cable laying in a traffic area?

A

24 inches

64
Q

When are log readings conducted on a running generator?

A

every hour

65
Q

What is the significance of hearing unusual sounds emitting from generator?

A

malfunction

66
Q

If the load of a generator becomes too large to handle, what actions should be taken?

A

add another generator in parallel

67
Q

Before two generators can be paralleled, which of the following conditions must be met?

A

terminal voltages equal

frequencies have to be equal

their voltages in phase

68
Q

What prevents the operator from paralleling the generators if all conditions are not met?

A

Permissive paralleling relay

69
Q

All 5 Kw through 750 Kw generator sets are equipped with what types of batteries?

A

dry charged less electrolyte

CE1 September exam (17 decks)

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