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CE1 September exam > CE ADVANCE; CHAPTER 2,3; > Flashcards

CE ADVANCE; CHAPTER 2,3; Flashcards

1
Q

What rule is used to determine the direction of current in a given situation in an external
circuit to which the voltage is applied?

A

Left hand rule

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2
Q

the distance from zero to the maximum value of each alternation is called the?

A

amplitude

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3
Q

__________ of an alternating voltage
or current is the value of voltage or current at
one particular instant

A

The instantaneous value

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4
Q

Inductance is the characteristic of an electrical circuit that opposes the ?

A

the starting, stopping, or a change in value of current.

Symbol is L

Basic unit of inductance is Henry

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5
Q

The ability of a circuit to store electrical energy

A

Capacitance.

Basic unit of capacitance is a farad

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6
Q

Insulating material in a capacitor is referred to as the?

A

Dielectric

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7
Q

what, in a DC generator, replaces the slip rings of the AC generator?

A

Commutator

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8
Q

The annual load factor of a well operated base should be____ percent or more with a power factor of ___ percent or higher.

A

50 percent

80 percent

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9
Q

electrical loads are generally measured in terms of?

A

amperes, kilowatts, or kilo volt amperes.

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10
Q

what must be determined before designing any part of the electrical system?

A

load

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11
Q

The NEC requires emergency and standby systems to be kept entirely separate from all other wiring and equipment. Which NEC art?

A
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12
Q

What do damper bars do?

A

damper windings provide stable parallel operation, reduce damping current loses, and limit the increase of third harmonic voltage with increase load.

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13
Q

what is field excitation?

A

when a dc voltage is applied to the field windings of a dc generator, current flows through the windings and sets up a steady magnetic field.

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14
Q

characteristic of a series wound generator?

A

the output voltage varies with the load current. Not used much

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15
Q

characteristic of a shunt wound generator?

A

the output voltage varies inversely with load current.

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16
Q

characteristic of a compound wound generator?

A

provides a constant output voltage under varying load conditions.

17
Q

The noise levels of generators sized from 5 kW to 200 kW range from 77 dBa to ___ dBa
(adjusted decibels) at 25 feet.

A

93 dBa

18
Q

single/double hearing protection required?

A

84 and 104

19
Q

generators should not be closer than ___ Feet to a load because of noise, fire, and air circulation.

A

25

20
Q

Generator should not be operated while inclined more than ___ degrees from level.

A

15

21
Q

The changeover board assembly is equipped with

a voltage change board to facilitate conversion to 120/208 or _____ generator output voltage.

A

240/416

22
Q

In parallel, the output is? (Changeover board)

A

120/208

23
Q

In Series, the output is? (Changeover board)

A

240/416

24
Q

It is imperative to solidly ground all electrical generators operating at?

A

600 volts or less.

25
Q

A ground rod has to have a minimum diameter of ___ inch if solid and ___ inch if
pipe, and it has to be driven to a minimum of 8 feet.

A

5/8

3/4

26
Q

if the conductor is too small to carry the current demanded by the load what will happen?

A

heat up and possibly cause cause a fire or open circuit.

27
Q

the duties assigned to the personnel on generator watch can be divided into three main categories?

A
  1. operating the equipment
  2. maintaining the equipment
  3. keeping the daily operations log.
28
Q

what must you do before you start generator?

A

complete the prestart checklist in sequence.

29
Q

NATO slave receptacle?

A

used to jump start other pieces of equipment that has 24 vdc starting system.

30
Q

reconnection board reconfigurations?

A

120 to 208 for low wye

240 to 416 forhigh wye

31
Q

Never hold the engine control switch in the start position longer than ____ seconds.

A

15

32
Q

what will happen if the generator doors wont close?

A

the generator is deadlined

33
Q

paralleling generators?

A

When the blinking slows to a rate of once per second or slower, close the main circuit
breaker of the incoming set while the SYNCHRONIZING LIGHTS are dark. The phase sequence
relates to the order in which the generator windings are connected

CE1 September exam (17 decks)

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