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Em1 Swe 2013-2014 > General > Flashcards

General Flashcards

1
Q

Where are CSMPs exported to?

A

fleet logistics system

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2
Q

What is the theory of the PGA-EG backup control in relation to fuel and current?

A

Increased fuel causes a decrees in current reverse-

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3
Q

What is the theory of the PGA -eg backup control in relation to fuel and current

A

Increased fuel causes a decrease in current Reverse-acting

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4
Q

How does a magnetic speed pickup MPU work?

A

Produces an output voltage when any magnetic material moves through the magnetic field at the end of the pickup.

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5
Q

When 3 factors effect the output voltage of the MPU?

A

Surface speed, voltage in increased gap, vol waveform is determined by size and shape of gear tooth in relation to the pole piece.

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6
Q

What is the distance of the pick up and the gear normally set at?

A

.25 and 1.02mm ( .010 and .40 in)

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7
Q

What is the minimum output voltage RMS at the pick ups lowers settings

A

1.5 vac

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8
Q

What direction will be compensated for a negative error signal and a positive error signal

A

Negative to port positive to starboard

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9
Q

what type of cathodic protection is on the 110s and 225

A

CAPAC

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10
Q

Which relay must be Mannual reset in the water circuit of a boiler

A

The #2 low water relay

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11
Q

What switch monitors steam demand

A

Operating limit pressure control switch

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12
Q

What switch is a safety back up for the operation limit pressure switch

A

High-limit pressure control switch

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13
Q

What does the high and low pressure control switch do?

A

Controls the firing rate upon steam demand

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14
Q

What does the open damper purge switch check

A

Test full airflow through the boiler during the pre purge stage

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15
Q

What does the open damper purge switch check

A

Test full airflow through the boiler during the pre- purge stage

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16
Q

What is the maximum depth for under cutting

A

1/16 in to 1/64

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17
Q

What megger voltage should be used for field windings, 1000 or 500

A

500v

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18
Q

What is the purpose of the 4-20 MA transducer

A

Convert measured pressure into an electric output

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19
Q

What is the major mechanical component of pressure transducer

A

A diaphram

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20
Q

What is the 2 wire system voltage

A

28 volts

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21
Q

What is the allowance change request ACR form?

A

Navsup 1220-2

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22
Q

What is the four wire system voltage?

A

115volts ac

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23
Q

Name two types of metals used for RTDs

A

Nickel and platinum

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24
Q

What are the three types of RTDs

A

Therowell bareblub, and embedded

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25
Q

What is the relationship of resistance to temperature

A

Positive temp coefficient. Increase in resistance increases with an increase in temperature

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26
Q

What are the wire colors if k and j type thermocouples

A

Type J. White / red

Type K red/ yellow

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27
Q

What are the ranges of J and K thermocouples

A

K 40-530

J 0-1200

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28
Q

J and K metals?

A

K chromell and allumel

J iron and constantum

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29
Q

What is the type of cables used with type j and k

A

LSTCKX. And LSTCJX. Or LSTCTS

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30
Q

What is the stick off voltage used in CT syncros?

A

2.5 v

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31
Q

115 volt circuit at electrical zero what will s2 read?

A

52 volts

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32
Q

What 2 leads are swapped in a syncro to change rotation.

A

S1 and s3

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33
Q

What 2 leads are swapped to make a 180 degree change ?

A

r1 and r2

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34
Q

What is the designation for wind speed and wind direction circuits

A

HE and HD

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35
Q

What must be done to the Aerovane circuit if to vanes are used?

A

The 1150 ohm resistors must be removed.

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36
Q

With a single Aerovane circuit what is the voltage per MPH, KPH and knots?

A

1056 CDC mph
0656 CDC kmh
1215 vdc knot

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37
Q

Wind speed formula

A

Rpm x .04839 miles

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38
Q

Describe the salinity cell in water makers

A

Measures free ions in between 2 metal plates. Higher impurities will increase current

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39
Q

During normal operation is making a good water is the dump solenoid energised or D energized

A

Energized

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40
Q

What is the thermistor used for?

A

To compensate for increased temperature of water with a logarithmic temperature coefficient. Increased temperature decrease resistance equals conductance

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41
Q

FD FR F FZ and HF mean

A

Flooding CO2, high temp, security airflow indication

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42
Q

What is the intensity of the homing beacon?

A

1500 foot candles at 330 degrees

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43
Q

What is the step voltage for the homing beacon ?

A

115/ 32 volts

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44
Q

What is the direction of the dead edge lights and their step Voltage

A

Omin directional 115/12 v

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45
Q

Direction of line up lights?

A

Bi directional 115/6.5

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46
Q

Where are the vertical drop line up lights on the step voltage

A

Aft strbd below landing deck 115/11v

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47
Q

How far apart are the HIFR lights

A

40 ft

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48
Q

What side of the ship are the HIFR lights on?0

A

Port

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49
Q

What is the maximum difference between rudder angle indicators?

A

+/_ 2 degrees

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50
Q

What is the variable voltage of the wiper system

A

68 vdc 115vc fixed 40vdc

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51
Q

What are the three types of wiper system

A

Rotary, pendulum and straight line

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52
Q

On batteries what is the compensation on Hydra meter for increased decreased in temperature relative to 80°F

A

3° either direction either direction subtract .0001

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53
Q

How does the equalizing charge on a battery work

A

A periodic extended normal charge given on at the finishing rate to ensure that our sulphate is driven from the plates and that the cells are restored to the max specific gravity

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54
Q

What is the polarization indexed test?

A

Megging the windings of a motor for 10 mins constantly and writing the results of the first and last minute.

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55
Q

What is a floating charge

A

Is a chargering source maintained at 2.13 to 2.17 vdc per cell of battery

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56
Q

What is the maximum difference in airgap readings between measurement under all the field poles of a motor or generator

A

10%

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57
Q

What is the proper tool for measuring air gaps

A

Machinists tapered feeler guage

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58
Q

Name the two types of bearings in motors and generators

A

Roller and sleeve bearings

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59
Q

What are the proper distance from brush holders in relation to the commentator

A

1/8 inc in max and 1/16 min

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60
Q

What grade of sandpaper should be used in seating brushes

A

80 gritt

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61
Q

What direction should the paper be applied

A

Opposite the rotation

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62
Q

What direction should the rotor be turned?

A

In the direction of rotation for 5 to 6 revolutions

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63
Q

What is approved material for sowel pins

A

304 stainless

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64
Q

What is the preferred method for motor pump alignment

A

Indicator reverse Method

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65
Q

What is it common type of switchboard circuit breaker

A

AQB

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66
Q

What does the AQB-LF c/b contain

A

Fused over current protection

67
Q

What does the NQB the cb lack that the AQB contains

A

An automatic tripping device

68
Q

Why are some characteristics of the day ALB circuit breaker

A

Designed for low voltage 120 V a C or DC has automatic trip in overload

69
Q

What is the difference between active and passive ground detectors

A

Active sends a reference voltage through the system while a passive detector measures a difference of potential to ground

70
Q

What is the formula for determining power factor

A

ExIx

1.73/1000= kva

71
Q

State the relationship of current to voltage to and current to resistance in an electrical circuit.

A

Current Is directly proportional to the voltage and inversely proportional to resistance

72
Q

What does the left handed rule determine direction of?

A

Magnetic lines of flux

73
Q

Define inductance

A

And electrical conductor of that opposes a charge in current

74
Q

Can AQB breakers be held closed in a tripping state

A

NO

75
Q

Name three types of Transformers

A

Iron core, air core and softiron

76
Q

Which is used for a high-frequency applications over 20 killer hurts

A

Air core

77
Q

What term describes the primary and secondary winding relationship in a transformer

A

Mutual induction

78
Q

In an open delta transformer con- figuration what is the output reading

A

57.7%

79
Q

Define capacitance

A

The ability for a circuit or a body to store a electrical charge equal to accumulator charge divided by the voltage

80
Q

Define inductance

A

The production Of magnetization in a body by the proximity of a magnetic field

81
Q

The parts of the compass element

A

Gyro spare vertical ring support plate follow-up system components the compass card

82
Q

What is the primary difference between mark 27 gyro and the other gyro used in the Coast Guard

A

It does not read pitch and roll contains a liquid ballast

83
Q

Define rigidity

A

The ability to maintain a fixed position in space

84
Q

Where are the weights applied to make a Gyro North seeking

A

On the bottom of the vertical ring and on the west side of the Gyro rotor heavier weight on the west side

85
Q

What is the nominal time value allowed for load balance to return upon energizing a large load to a circuit

A

2 seconds

86
Q

What is the in

NSTM for electrical distribution

A

320

87
Q

How are casualty power cables labeled in relation to phase

A

Abc 123 red black white

88
Q

At what percentage of voltage drip and for what period of time are ABTs set at

A

60 to 70 percent at .3 to .5 sec

89
Q

When will the ABT’s restore to normal power

A

85 percent to. 90 percent of voltage

90
Q

What is the max horsepower of motor in a 440 V motor that can be fused

A

7.5hp

91
Q

What are the three types of fuses

A

Normal blowing, time lag and very high-ampere interrupting capacity

92
Q

What is a common characteristic of new shipboard cable

A

They are all low smoke cables LS

93
Q

What percent over the load should fuses be in transformer and inductive load circuits

A

125 percent

94
Q

What about motor load circuits

A

250 to 400 percent

95
Q

What are the two navy service classifications of motors ?

A

A and C

96
Q

What are three types of motor ratings

A

Continuous, intermittent, and short time duty

97
Q

What is the general characteristics of most motors on ships

A

They are Polyphase induction motors

98
Q

Definition of an induction motor

A

A primary wind is wired to the power supply which uses a rotating magnetic field into the second winding which in Turns creates a magnetic field which moves the rotor causing mechanical action

99
Q

What is slip?

A

The actual speed of the rotor in realation to the rated synchronous Speed

100
Q

What term describes the speed of rotation

A

Synchronous speed

101
Q

What is the formula for slip

A

120 times the incoming power frequency divided by the number of poles in the primary winding

102
Q

What are for types of DC motors

A

Shunt series compound and stablized shunt

103
Q

Define shunt

A

Field coils connected in parallel with the armature. Used on moderate torque start up and speed which is not affected by change in load

104
Q

Define series motor

A

Field coils in series with armature have high starting torque

105
Q

Define compound motor

A

Has both series and parallel windings to armature

106
Q

Define stablized shunt

A

Similar to compound except the series winding is lower strength to allow for motor consistency with change in load

107
Q

What is the ideal specific gravity for lead acid batteries

A

1.210 to 1.220

108
Q

What is the maximum specific gravity for lead acid batteries?

A

1.350

109
Q

What is the min specific gravity for lead acid batteries

A

1.210

110
Q

I’m nonmetallic hulled ships how offten are the ground straps be inspected

A

Annually

111
Q

Why is N STM reference for working on energised circuits

A

300 2.5.2

112
Q

At what voltage amperage rating may dead right fuses be gremoved without de energising the load?

A

480 volt 10 amp

113
Q

How many Power strips can be on a circuit

A

One and the circuit must be a one Isolate receptacle circuit

114
Q

Which type of ground detector uses lights and voltmeters

A

Passive ground

115
Q

Which type of ground detector applies dc voltage between and operating power system and-ground

A

Active ground

116
Q

When taking installation reading what voltage should you set the megger at

A

500 vdc

117
Q

What is the DC high potential test

A

A test where dc voltage is applied in steps and current leakage is measured to identify grounded or potentially failing insulation on motors

118
Q

What is the Ac high potential Test what is the major precaution.

A

A test which induces A ac voltage through a motor or generator to detect defective insulation it is a more rigourous test and should not be done except at repair facility due to possible damage to equipment and personnel

119
Q

How afternoon should shock mounts be inspected

A

Every six months

120
Q

What are the maximum allowed spices for a cable

A

2

121
Q

What metal should be used on plating be on steel bolts used for electrical connections

A

Zinc

122
Q

What are the tolerances for a brush holders distances from the commentator

A

No more than 1/8 ad no less then 1/16

123
Q

Name three methods of determining the correct neutral position for motors and generators

A

Mechanical method, reversed rotation method and the kick method

124
Q

What are two tool shapes for under cutting mica

A

V and u

125
Q

Which one requires Chamfeting only upon completion

A

U

126
Q

What should be done upon completion of undercutting of Mica

A

The commutator should be Stoned

127
Q

Name two types of batteries

A

Primary cell Non re- chargeable and second cell rechargeable

128
Q

Name of primary cell types

A

Lead acid, alkaline, nickel cadmium, zinc

129
Q

Name types of second cell types

A

Dry cells, lithium cells

130
Q

Define a battery

A

A unit consisting of positive and negative plates. Separators a cell cover and electrolyte

131
Q

What is the discharge Rate of a a battery

A

10 hr discharge rate of a battery is equal to the consistent current in amps which the battery starting with an initial electrolyte temperature of 27°C 80°F can supply continuously for 10 hours before the voltage has dropped to the low voltage limit which the discharge should be start

132
Q

What is the ampere -hour capacity

A

The amount of hours the battery will deliver at that rate before voltage drops below it specified number of limiting voltage capacity is greater when discharge is slow

133
Q

What is the normal pressure of a sealed battery and what is it relief point

A

2-3 psi and 4-5 psi

134
Q

What happens to current flow on a charging battery

A

it is reversed

135
Q

How high above the separator should the electrolyte be ?

A

9mm or 3/8 in

136
Q

How long will dry cell batteries last in storage

A

Up to 2 years

137
Q

How long will wet batteries lasted storage

A

They need to be re-charged every 4 to 6 months

138
Q

What is the expected life range of a lead acid battery if taking care of properly

A

Four years according to NSTM chapter 313

139
Q

What does the floating ball charge colours mean in percent

A

Red white and green equals 90%
Red and white equals 50%
Red equals 10%

140
Q

Know the different types of charges?

A

Normal , float and boost ( emergency)

141
Q

What is the proper charge level of a vented and sealed battery

A

Vented should be at .005 of specific gravity corrected temperature sealed should be an approximate 2.33 volts DC per cell

142
Q

How often should floating charge batteries be checked

A

Every 90 days

143
Q

When does a boost charge need to be applied to vented batteries

A

If there is more than .010 difference between two cells or there is a drop more than .015

144
Q

What is the rate of discharge in a battery

A 
One hour equals 55%
2 hr equals 65%
three hour equals 75%
6 hr = 90 percent
10 hr = 100 percent
145
Q

When does a boost charge need to be applied to a sealed battery

A

If a cell drops below 2.10 V DC

146
Q

At what temperature should you terminate a charge to a vented battery

A

125 degrees

147
Q

If batteries are stored in a cool place around 4°C what can a specific gravity be raised to

A

1.275 or 1.285 per cell with an average of 1.280

148
Q

What is the max specific gravity of sulfric acid to be added to a battery

A

1.350

149
Q

What is the federal regulation determining the purchase for distilled water for batteries

A

Oh – B – 41. O- S – 801

150
Q

What are the three signs of sulfation on a battery

A

Falling specific gravity, low voltage discharge and loss of capacity

151
Q

Types of batteries on a 47

A

Agm gell cells

152
Q

Liquid electrolyte from a lead acid battery should be neutralised with

A

Baking soda or alkali

153
Q

Never allow the battery to stand in a completely discharge condition for more than

A

24 hours

154
Q

Always replace batteries in

A

Sets or pairs at the same time

155
Q

A routine charge given in accordance with the data on the nameplate during ordinary cycle operation to restore the battery to a substantial fully charged condition

A

Normal charge

156
Q

An extended charge given periodically to ensure that all the sulfate is driven from the plates in all the cells are restored to a uniform specific gravity

A

Boost charge

157
Q

When putting a boost charge on batteries for at least four hours when and how long do you take readings for

A

Taking a 30 minute intervals to fully charged

158
Q

During mixing yes it must be ported to the water and not the water poured into the acid the acid——– to prevent excessive heating and splashing

A

Must be added slowly and cautiously to the water

159
Q

What happens when salt water comes in contact with batteries

A

Chlorine gas is formed

160
Q

What are the key dividers in the wye connector generators

A

Voltage per leg of the winding is equal to the line voltage divided by 1.73 phase current is the same as line current

161
Q

What are the key dividers in delta connected generators

A

Voltage is the same as line voltage current per leg is equal to line Current divided by 1.73

162
Q

What is the synchronous speed of a 60 Hz , 4 and six poll generator

A

3600 and 1800 and 1200 rpm

163
Q

What is the synchronous speed PDA 400 Hz 2

, 4 and 6 poll generator

A

24K 12 K and 8K

164
Q

What type of rotors are most common

A

DC excited revolving field

Em1 Swe 2013-2014 (9 decks)

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