Test 3 Flashcards Preview

Mart 201 > Test 3 > Flashcards

Flashcards in Test 3 Deck (136):
1

What is the formula for safe working load?

Breaking strain divided by safety factor

2

Where is the safe working load marked on a crane?

On the heel of the boom.

3

How often is cargo gear surveyed or recertified?

Surveyed every five years, and re-certified annually

4

What are the three motions of pedestal cranes?

Slew, luff, hoist

5

What does a runner/whip do?

Controls the vertical position of the load

6

What does a topping lift do?

Controls the height of a conventional (yard and stay) boom

7

What does a luffing wire do?

Controls the height of the pedestal crane boom

8

What is slewing?

The motion of a pedestal crane rotating at the base

9

What is luffing?

The motion of a pedestal crane in which the boom itself moves up and down

10

What is hoisting?

The motion of the cable or wire actually raising the load

11

What is “out reach” referred to as in regards to US Coast Guard license questions?

Load radius

12

How is slewing accomplished on a pedestal crane?

By ring gear and slewing motors.

13

What are the three types of slewing cranes?

Conventional, low type, heavy lift.

14

What’s the difference between a conventional and low type crane?

A conventional crane boom is raised by luffing wire, and low type crane boom is raised by hydraulic cylinders.

15

What is level luffing?

Raising or lowering the boom without appreciable rise or fall of the cargo hook.

16

When is level luffing most important?

When the careful movement of a load near ground level is required.

17

What two instances Can level luffing not be achieved?

With conventional yard and stay cargo gear, or low type pedestal crane

18

What is the safety factor of cargo gear?

Five

19

What happens when a boom or crane is lowered?

Out reach increases, and the SWL decreases

20

What are the factors affecting cargo gear selection in a vessel design?

Preferences of potential charters
Cargo handling capabilities of anticipated ports of call
Likelihood of project cargo bookings
Additional weight of cargo gear itself
Stability considerations

21

Cargo gear has a high

Vertical center of gravity

22

What type of ships carry project cargo?

Heavy lift ship’s

23

What is safety factor?

The ratio of strength to an expected load

24

Project cargo is

Too heavy or large to be carried on conventional cargo ships. Has special carriage requirements

25

What is luffing sometimes referred to as?

Topping the boom

26

What is the average maximum pulling capacity of a drum winch ?

10–25 tons

27

What is the term used to describe when a pedestal crane is secured?

Cradled

28

On a slewing crane what causes brakes to be applied if there’s a loss of power?

A zero voltage device

29

An automatic shut down if any part of the crane experiences overload is a

Overload safety

30

A switch which stops the crane if the hoist is raised too high is a

Hoist limit

31

What stops the crane if less than three wraps are left around the drum?

Empty drum

32

What stops the boom from going to high or low?

Limit switch

33

What kind of cargo is typical for a gantry crane?

Containers or bulkers

34

What are advantages to side loaders?

Minimal impact on stability, more direct cargo movement, cover dock possibilities.

35

What are disadvantages to a side loader?

Hull strength reduction “hull girder”, elevators take space, less weight capability, smaller parcels

36

Who tests and certifies cargo gear?

The classification society

37

What cargo gear is included for testing?

The crane structural assembly, rigging, wire ropes, sheaves, cargo hook, loose gear such as shackles slings and spreaders.

38

What type of material is used for a stopper?

The same type of material as the mooring line, except in the case of wire, we use a chain stopper.

39

While inbound or outbound in pilot waters, and anchor is always

Lowered from the hawse and ready to let go

40

Who typically stands by anchor ready to let go for emergencies?

The chief mate, or a licensed deck officer and a boatswain or AB

41

Holding power comes from

Weight of the anchor and the scope of the chain

42

What kind of anchors are mostly used on seagoing vessels?

Stockless

43

The scope of a chain is usually

5 to 7 times the depth of the water

44

Where must a ship be positioned when heaving an anchor?

Directly over the anchor

45

What is SOG?

Speed over the ground

46

What is the term used to describe the anchor secured into the Haus pipe?

Anchors home

47

What is located in the Haus pipe to remove mud?

Water washdown jets

48

A machine used to handle anchors and typically has drums for mooring line handling is known as a

Windlass

49

A drum on a windlass is referred to as a

Gypsy head

50

A deeply grooved drum on the winless with sprockets and pockets which engage the links of the anchor chain is the

Wildcat

51

What prevents a chain from fouling on the wildcat

A stripping bar

52

A capstain head, drum or gypsy head are all

Drums fitted to the windless

53

A riding Pawl is a

One way device when set

54

When a pawl is down

The chain cannot pay out but can be heaved in

55

When is the only time a riding pawl will be raised?

When the anchor is dropped or lowered

56

A shot of chain is equal to

15 fathoms or 90 feet

57

Arranging a mooring line on deck in long bites with half turns at the ends of the bites is known as

Faking

58

What’s the largest non cargo space aboard ship?

Engine room

59

What are the the cycles in order on a four stroke?

Intake
Compression/ignition
Power/expansion
Exhaust

60

When does combustion occur?

At TDC

61

What type of ignition is diesel?

Compression

62

What type of ignition is gas?

Spark

63

Ic engines aboard ship are usually started with

Compressed air, hydraulics or electric

64

Main engines and generators are started with

Air

65

Emergency generators may be started by

Hydraulic or battery power

66

Classification societies require enough air capacity for

12 starts, including reversals

67

Right handed propellers produce forward thrust when turning

Clockwise

68

Left handed propellers produce forward thrust when turning

Counter clockwise

69

The distance a propeller will advance in one revolution

Pitch

70

Units of pitch

Feet

71

Pitch is determined by

Angle formed by blade and axis of hub

72

The least refined fuel oil is

HFO- heavy fuel oil

73

Marine diesel oil is

More refined than HFO and has a lower viscosity

74

What is the cleanest fuel?

Natural gas

75

What type of fuel is not used for large engines?

Gasoline

76

What are the requirements of MARPOL Annex VI?

EST emission control areas
Worldwide limits on NOx and SOx
EST preclusions for deliberate emissions of ozone depleting substances
EST fuel quality standards (sulphur by content)
Ushered exhaust gas scrubber technology into marine engineering

77

Two types of combustion air

Naturally aspirated
Supercharged

78

PM=

Particulate matter

79

Emission control areas

Mediterranean
Baltic
Black
Red
Gulfs
North
Antarctic s of lat 60
Caribbean

80

Where is automation found aboard ship?

HVAC
Fuel oil transfer
Bilge
Waste water treatment
Iron mike

81

Any change in the magnetic field of a coil of wire will cause an electromagnetic force to be induced into the coil.

Faraday’s first law

82

A device that converts mechanical energy to electrical energy for use in an external circuit

Generator

83

Hydraulic flow ~

Electrical current

84

Hydraulic pressure ~

Electrical voltage

85

Hydraulic resistance ~

Electrical resistance

86

Describe the flow of energy

Fuel to generators to main/aux buss to transformers to loads

87

What’s at various junctions?

Circuit breakers

88

Transformers do what two things?

Step up or down voltage

89

A buss is a

Distribution node

90

What two things do busses do?

Receive energy from generators and distribute to loads

91

What are 5 prominent propulsion modes?

Rudder/propeller
Kort nozzle
Azipod- mover in pod
Cycloidal
Z-drive mover in hull

92

The comparison of theoretical distance traveled to observed distance traveled is

Propeller slip

93

How do you calculate slip?

1-(observed distance/calculated distance) x 100%
Or
1-(actual travel/pitch travel) x 100%

94

Formation of vapor bubbles (voids) in water near moving propeller is known as

Cavitation

95

A propellers tendency to cause the ship to rotate about the vertical axis at slow speeds ahead or astern is known as

Wheel or walking effect

96

Which direction will a right handed propeller walk a vessel?

Stern to starboard and bow to port

97

When backing, a right hand propeller walks the vessel

Stern to port and bow to starboard

98

Fixed pitch propellers advantages

Less apt to damage
No rotation when no power
Less dangerous for mooring
Less risk of propeller entangled in mooring lines

99

Fixed pitch propeller disadvantages

Too many rpms during adverse weather
Limited range of rpms for maneuvering and power

100

Controllable pitch propeller advantages

Propel at all engine speed
Quick change from ahead/astern
Improve efficiency
Main engine runs at optimum rpm
Easily combined with shaft generator
Stops with max power
Changing one blade is possible

101

Controllable pitch disadvantage

Vulnerable to damage due to hydraulic components and seals
Oil pollution
Creep at 0 pitch
Unusual handling characteristics
Loss of steering in neutral position
Difficult to repair
Price
Still turns at all stop

102

What type of propeller is most likely to foul a mooring line?

Controllable pitch

103

What is a nozzle on a propeller?

The shroud

104

A thrust bearing is designed to

Transmit the thrust of the propeller to the vessel

105

Bow and stern thrusters are

Great at speeds less than 3 kt
Can be a propeller in a fixed transverse tunnel
Can be retractable or swiveling
Can be cycloidal

106

The perfect propulsion system for precise maneuvering even under adverse conditions

Vogt-Schneider cycloidal propulsion

107

The VSP magnitude and direction of thrust is

Infinitely variable

108

With VSP the magnitude of thrust is determined by the

Rotational speed of the disk

109

With VSP the direction of thrust is determined by the

Blade angle

110

Stabilizers can reduce rolling up to

80-90%

111

What on a ship utilizes faradays law?

Shipboard generators

112

Phases for dc power

None

113

Phases for ac power

Single and 3

114

Dc power is found

In nature
Ie static electricity
Lightning

115

Dc current can be produced by

Battery-and stores
Dc generators
Fuel cell
Solar cell

116

Dc is preferable for

Emergency lighting and winch motors

117

Can we utilize static electricity?

No

118

Which current is used for most power loads?

Ac

119

All electrical generators produce

Ac current

120

The rate at which the polarity is reversed is called

Frequency

121

Frequency=

(#poles x rpm) divided by 60

122

Frequency is determined by

Speed and construction of the generator

123

Common shipboard frequency

60 Hz (U.S)
50 Hz (Europe)

124

Essentially, three single phase generators have been placed in one machine

3 phase ac

125

Which phase is common for machinery?

3

126

Which phase is common for lights and electronics?

Single

127

Advantages to 3 phase

Universally for transmission of ac
Higher power to weight ratio of alternators
Cheaper
Less line to transmit
Self starting
Instantaneous power is steadier
Better power factor
Less ripple effect when rectified into ac

128

UPS

Uninterrupted power supply

129

Ups consists of a

Battery, battery charger, and inverter to convert dc to ac.

130

A ups provides

Temporary electrical power in case of main power disruption

131

An emergency generator is typically a

Small diesel generator

132

Main components in ships electrical power system

Fuel
Heat
Generators
Electrical busses
Transformers
Circuit breaker
Loads

133

Reverse power relays

Prevent generators from becoming motorized if one fails

134

Name three electrical protection devices

Fuses circuit breakers and reverse power relays

135

Dc frequency =

0

136

Typical ac loads on ship

HVAC
Bridge electronics
Accommodations
Lighting
3 phase motors