[Generators and Switchboards]

Question 1

How many volts are brushless generators?

Answer 1

240-450 V

Question 3

How does the operator monitor the power from the generators?

Answer 3

Main power distribution switchboard

Question 4

What is loss of power in the form of heat called?

Answer 4

Hysteresis loss

Question 6

What provide power to bus bars inside the switchboards and each distribution panel?

Answer 6

Feeders (large cables)

Question 7

What is a smaller version of the main distribution switchboard that provides power to vital services?

Answer 7

Emergency switchboard

Question 8

What is converted into energy to turn the generator?

Answer 8

Fuel

Question 9

What is a chemical process that reduces the number of electrons in a substance because the electrons migrate to other areas?

Answer 9

Oxidation (rust)

Question 12

What is the electrical/physical connection between the main and emergency switchboard bus bars?

Answer 12

Bus tie

Question 14

What is accomplished by connecting a battery to the exciter field terminals?

Answer 14

Flashing the field

Question 15

What controls the ship service generated power and shore power?

Answer 15

Main power distribution switchboard

Question 18

How are brushless generators rated?

Answer 18

Kilovolt-ampere (kVA) at a specified power factor (PF)

Question 20

What consolidates all the motor controlling equipment for all the major motors onboard the vessel?

Answer 20

Motor Control Center (MCC)

Question 21

What controls the output of the generator by controlling the magnetic field in the stationary exciter field winding?

Answer 21

Voltage regulator

Question 22

What refers to physical connections between conductive materials and the earth?

Answer 22

Grounding

Question 23

What is used to show the change in current direction of the AC system?

Answer 23

Sine wave

Question 24

What leave the distribution panel circuit breakers and provide power to individual loads?

Answer 24

Branch circuits

Question 27

What type of grounding system do Army watercraft use?

Answer 27

Ungrounded current-carrying

Question 28

Where are the four sets of generator windings in the brushless generator?

Answer 28

• 2 are connected to generator mainframe

* 2 are fitted to the rotor shaft

Question 30

What support the mainframe?

Answer 30

Mounts

Question 32

What are short-circuited at each end to allow currents to circulate so that a magnetic field can be produced to oppose any change in prime mover motion?

Answer 32

Amortisseur (damper windings)

Question 33

What is a ground system that uses an insulated current-carrying conductor and a direct wiring connection to the earth?

Answer 33

Neutral system

Question 34

What states: “An induced effect is always such, as to oppose the cause that produced it?”

Answer 34

Lenz’s Law

Question 35

What are used to carry the large generator loads within the switchboard?

Answer 35

Bus bars

Question 38

What consists of four to eight individual coils or pole pieces keyed to the rotor shaft?

Answer 38

Main rotating field

Question 39

What is the chemical process in which a substance loses or gains electrons?

Answer 39

Electrolysis

Question 45

Which end contains a bearing that supports the internal rotor shaft?

Answer 45

Bell end

Question 46

What is a three-conductor, three-phase rotating winding located directly inside the exciter stator?

Answer 46

Exciter armature

Question 48

What allows an abnormal circuit to be separated from the electrical distribution system very close to the fault?

Answer 48

Selective tripping

Question 49

What is used to change the exciter portion output from AC to DC?

Answer 49

Rotating rectifier

Question 51

What is a strong metallic structure surrounding and retaining the stationary windings?

Answer 51

Mainframe (housing)

Question 52

What is the stationary DC energized winding where the DC magnetic field is initially developed?

Answer 52

Exciter field

Question 53

What device allows alternating voltages to be stepped up or down in amplitude?

Answer 53

Transformer

Question 57

How should dirt and grease/oil be removed?

Answer 57

Dirt should be vacuumed and grease/oil should be cleaned with lint-free rags

Question 58

What are rubber composition or springs incorporated into the mounts as shock absorbers?

Answer 58

Resilient mounts

Question 61

What indicates one cycle per second?

Answer 61

Hertz

Question 62

When contamination is found, what should be used to check the insulation values?

Answer 62

Megger

Question 63

Who supervises internal inspection of the ship service generator?

Answer 63

Chief engineer or their appointed representative

Question 68

What is 180 degrees of rotation called?

Answer 68

Alternation

Question 69

What is designed to change electrical energy back into mechanical energy to do work?

Answer 69

Electric motor

Question 70

What is the prime mover for the generator?

Answer 70

Diesel engine

Question 71

What portion of the generator is connected to the diesel engine?

Answer 71

Yoke end (frame end)

Question 72

1) Where are the main generators located? | 2) Where is the emergency generator located?

Answer 72

1) Engine room | 2) Above the waterline in a separate compartment

Question 73

How is the speed of the generator calculated?

Answer 73

Frequency ————————— # of pairs of poles

Question 74

What are the two basic power sources for the switchboard?

Answer 74

* Generator | * Shore power

Question 75

How many separate windings do PMGs (Permanent Magnet Generators) have?

Answer 75

6

Question 76

How many windings are in the brushless generator?

Answer 76

4

Question 77

What of an AC generator must not change?

Answer 77

Frequency

Question 78

What determines the speed the prime mover must turn the rotor to maintain a frequency of 60 Hz?

Answer 78

Number of poles

Question 79

What are installed in switchboards and distribution panels to separate abnormally operating electrical apparatus from the rest of the system?

Answer 79

Circuit breakers and fuses

Question 80

What is the grounded conductor in the case of Army watercraft?

Answer 80

Hull of the vessel

Question 81

What is attached from the generator housing to the engine bed to connect the diesel generator set to the engine bed with a conductive path?

Answer 81

Grounding strap (flexible shunt)

Question 82

What is the current produced by Earth?

Answer 82

Telluric current

Question 83

In the neutral ground system, what is insulated throughout its circuit and retains the circuit breaker protection?

Answer 83

Phase conductor

Question 84

In the neutral ground system, what is insulated throughout the entire circuit, normally without a circuit breaker?

Answer 84

Neutral conductor

Question 85

In the neutral ground system, what is the safety circuit designed specifically to carry current during an abnormal condition to protect the operator?

Answer 85

Ground wire

Question 86

What have an outstanding resistance to oxidation?

Answer 86

Noble metals (zinc anodes)

Question 87

What means that the generator is supplying power through the switchboard to the loads?

Answer 87

On line

Question 88

What automatically connects the emergency generator to the emergency switchboard when power is lost?

Answer 88

Automatic Bus Transfer (ABT) switch

Question 89

What is the most critical setting for paralleling AC generators?

Answer 89

Voltage setting

Question 90

What is happening when the generator is connected to the bus, but is not delivering power?

Answer 90

Floating on the line

Question 91

In electronic governors, what provide the voltage and current necessary for operating the electronic fuel control system?

Answer 91

Batteries

Question 92

What connect to the bus monitor and protect the feeders and branch circuits?

Answer 92

Automatic over current protective devices