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Topic 21 — Digital Twin Technology (MCQs)

Total questions: 79

Worksheet time: 40mins

Name
Class
Date
1.

Digital Twin Technology creates a virtual model that mirrors the real propulsion plant using:

a)

Manual records

b)

Random simulation

c)

Live sensor data

d)

Real-time, data-driven monitoring systems

2.

Which parameter is commonly monitored by a digital twin?

a)

Hull paint thickness

b)

Fuel flow rate

c)

Crew attendance

d)

Cargo temperature

3.

Digital twins help detect anomalies by comparing real engine conditions with:

a)

Weather forecasts

b)

Ship stability results

c)

Expected performance baselines

d)

Random system checks

4.

A major benefit of real-time monitoring using digital twins is:

a)

Increased bunkering time

b)

Early detection of performance deviations

c)

More paperwork

d)

Reduced electronic systems

5.

Predictive maintenance using digital twins relies heavily on:

a)

Ship color

b)

Historical data and machine learning

c)

Crew preference

d)

Drydock timing alone

6.

Which of the following can a digital twin predict?

a)

Captain’s decisions

b)

Number of passengers

c)

Component failure trends

d)

Port fees

7.

Digital twins help reduce unplanned downtime by:

a)

Guessing failures

b)

Predicting when parts will fail

c)

Allowing failures to occur

d)

Increasing overhaul intervals blindly

8.

Digital twins optimize fuel efficiency by analyzing:

a)

Crew meals

b)

SFOC and engine load

c)

Cargo planning

d)

Deck lighting

9.

Digital twins help ships comply with environmental rules like:

a)

SOLAS Ch. III

b)

MARPOL Annex IV

c)

EEXI and CII

d)

STCW Code B

10.

Digital twins can simulate operating scenarios such as:

a)

Engine room cleaning

b)

Different sea states

c)

Crew training hours

d)

Charter rates

11.

Scenario simulation helps engineers conduct:

a)

Drydocking

b)

Emergency muster

c)

Virtual sea trials

d)

Payroll activities

12.

Digital twins integrate with systems such as:

a)

Cargo cranes

b)

Ballast tanks

c)

Power management systems

d)

Accommodation lighting

13.

A hybrid propulsion system may combine engines with:

a)

Gas cookers

b)

Refrigeration compressors

c)

Battery storage

d)

Lifeboats

14.

A digital twin helps optimize vessel operations by integrating data from:

a)

Mess hall

b)

Laundry station

c)

Auxiliary engines and shaft generators

d)

Marine sanitation devices

15.

MAN CEON is an example of:

a)

Pollution-control equipment

b)

A digital twin system

c)

Steering gear

d)

Hull coating material

16.

Digital twins help improve documentation for:

a)

Hotel services

b)

Class compliance

c)

Passenger comfort

d)

Ship chandling

17.

A major advantage of digital twins in lifecycle management is:

a)

Faster painting

b)

Better carpet quality

c)

Monitoring long-term wear patterns

d)

Increased cabin space

18.

Which manufacturer uses digital twins for emissions forecasting?

a)

Maersk Training

b)

Wärtsilä

c)

Anglo-Eastern

d)

Kongsberg Hydro

19.

A digital twin can optimize propeller operation by analyzing:

a)

Anchor details

b)

Liferaft capacity

c)

Propeller pitch (CPP)

d)

Paint roughness

20.

Digital twins benefit cadet training by offering:

a)

Increased work hours

b)

Mandatory overtime

c)

Risk-free simulation environments

d)

Higher sea time requirements

21.

One key purpose of digital twins is reducing:

a)

Crew members

b)

Cargo load

c)

Operational costs

d)

Bridge equipment

22.

In a digital twin, real-time data is most commonly transmitted via:

a)

Paper forms

b)

Sensors and data networks

c)

Voice calls

d)

Hard drives

23.

Turbocharger tuning recommendations help improve:

a)

Passenger capacity

b)

Fuel efficiency and combustion quality

c)

Food supply

d)

Lifeboat operations

24.

Digital twins allow testing fuel type changes such as:

a)

Gasoline

b)

HFO to LNG

25.

The primary goal of digital twins is to create:

a)

A ship radio

b)

A new hull

c)

A virtual representation of the real system

d)

Better crew uniforms

26.

Reduced emissions through digital twins primarily involve managing:

a)

Paint fumes

b)

Refrigerant gases

c)

NOx, SOx, CO₂

d)

Oxygen levels

27.

Which is NOT improved by digital twins?

a)

Predictive maintenance

b)

Emissions optimization

c)

Entertainment systems

d)

Scenario simulation

28.

Digital twins assist in:

a)

Cleaning bilges

b)

Engine health monitoring

c)

Preparing meals

d)

Fuel bunkering

29.

When deviations occur, digital twins:

a)

Ignore them

b)

Alert the crew

c)

Shut down hotel loads automatically

d)

Increase speed

30.

Digital twins primarily support:

a)

Cooking operations

b)

Passenger safety

c)

Fuel and energy efficiency

d)

Cargo lashing

31.

Energy recovery systems mainly capture:

a)

Ballast water

b)

Fresh water

c)

Waste heat from diesel engines

d)

Cooling air

32.

An Exhaust Gas Economizer recovers heat from:

a)

Seawater

b)

Cylinder jacket

c)

Exhaust gas

d)

Lubricating oil

33.

EGEs mainly heat:

a)

Lube oil

b)

Cargo tanks

c)

Boiler feedwater

d)

Air conditioners

34.

A key benefit of steam turbines in recovery systems is:

a)

Lower engine RPM

b)

Additional power generation

c)

Bigger engine size

d)

Reduced voltage

35.

The Organic Rankine Cycle uses a fluid with:

a)

High boiling point

b)

Low boiling point

c)

No boiling point

d)

Constant temperature

36.

ORC systems convert low-grade heat into:

a)

Ballast water

b)

Cooling air

c)

Electricity

d)

Bilge water

37.

Thermoelectric generators convert heat into:

a)

Steam

b)

Pressure

c)

Electricity

d)

Water

38.

A major advantage of TEGs is that they:

a)

Require fuel

b)

Are heavy

c)

Have many moving parts

d)

Have no moving parts

39.

Fuel efficiency directly affects:

a)

Crew shifts

b)

Lifeboat drills

c)

Operating costs

d)

Passenger menu

40.

Two-stroke engines are typically:

a)

Less efficient

b)

More efficient

c)

Same as four-strokes

d)

Only for small boats

41.

Turbocharging improves efficiency by increasing:

a)

Exhaust smoke

b)

Engine weight

c)

Air supply

d)

Fuel dilution

42.

Common rail injection improves efficiency through:

a)

Random injection

b)

Precise injection timing

c)

Fuel overflow

d)

Air leakage

43.

The most efficient load for marine engines is around:

a)

30%

b)

50%

c)

70%

d)

85% MCR

44.

Fuel quality affects:

a)

Lifeboat capacity

b)

Hull resistance

c)

Emission levels and performance

d)

Anchor handling

45.

Low sulfur fuel reduces:

a)

Power

b)

SOx emissions

c)

Speed

d)

Load

46.

A well-designed hull improves fuel efficiency by reducing:

a)

Visibility

b)

Tank size

c)

Hydrodynamic resistance

d)

Crew duties

47.

Weather greatly affects fuel use due to:

a)

Crew seasickness

b)

Increased resistance in rough seas

c)

Bridge noise

d)

Wartime operations

48.

Regular maintenance ensures:

a)

More vibration

b)

Optimal engine performance

c)

Higher lube oil use

d)

Poor combustion

49.

EGR improves fuel economy by reducing:

a)

SOx

b)

NOx formation

c)

CO levels

d)

Freshwater use

50.

Speed optimization mainly reduces:

a)

Crew size

b)

Fuel consumption

c)

Draft

d)

Cargo capacity

51.

Route optimization avoids:

a)

Calm seas

b)

Severe weather and resistance

c)

Port calls

d)

Canal fees

52.

Load management minimizes:

a)

Fuel heating

b)

Unnecessary power output

c)

Crew sailing hours

d)

Steering corrections

53.

Waste heat recovery supports:

a)

Ship cleaning

b)

Increased overall efficiency

c)

Ballasting

d)

Vessel repainting

54.

Turbocharger waste heat can be used for:

a)

Lifeboats

b)

HVAC

c)

Additional power generation

d)

Cargo winches

55.

An ORC system is MOST suited for:

a)

High-grade heat only

b)

Low-grade heat sources

c)

Deck cargo

d)

Anchor chains

56.

EGEs reduce:

a)

Draft

b)

Fuel consumption

c)

Propeller pitch

d)

Bilge levels

57.

Common rail fuel injection improves:

a)

Tank cleaning

b)

Combustion quality

c)

Cargo heating

d)

Auxiliary loads

58.

A major aim of energy recovery systems is to reduce:

a)

Crew salary

b)

Lifeboat training

c)

Greenhouse gas emissions

d)

Refrigeration load

59.

Fuel efficiency strategies include:

a)

Higher noise

b)

Unplanned stops

c)

Engine tuning

d)

Random RPM changes

60.

VGT turbochargers improve performance at:

a)

Only full speed

b)

All engine loads

c)

No load

d)

Drydock

61.

Maritime Just Transition ensures decarbonization is:

a)

Forced

b)

One-sided

c)

Fair and equitable

d)

Optional

62.

Shipping contributes roughly what percentage of global GHG emissions?

a)

1%

b)

10%

c)

3%

d)

20%

63.

A main goal of Just Transition is protecting:

a)

Shipowners only

b)

Seafarers and maritime workers

c)

Passengers

d)

Customs officers

64.

Decarbonization aims to reach net-zero emissions by:

a)

2028

b)

2035

c)

2040

d)

2050

65.

The shift to low-carbon fuels requires investment of over:

a)

$100 million

b)

$10 billion

c)

$1 trillion

d)

$5 trillion

66.

A major responsibility of the Maritime Just Transition Task Force is:

a)

Canceling ships

b)

Closing ports

c)

Supporting seafarer training

d)

Increasing taxes

67.

The Paris Agreement aims to limit global warming below:

a)

5∘C5^\circ\mathrm{C}

b)

4∘C4^\circ\mathrm{C}

c)

2∘C2^\circ\mathrm{C}

d)

6∘C6^\circ\mathrm{C}

68.

The more ambitious target is limiting warming to:

a)

4∘C4^\circ\mathrm{C}

b)

1.5∘C1.5^\circ\mathrm{C}

c)

3∘C3^\circ\mathrm{C}

d)

6∘C6^\circ\mathrm{C}

69.

Decarbonization includes transitioning energy from fossil fuels to:

a)

Kerosene

b)

Wood

c)

Renewable sources

d)

Fuel oil only

70.

A key sector required to decarbonize is:

a)

Deep-sea fishing

b)

Airport retail

c)

Transportation

d)

Fashion industry

71.

Energy-efficient technologies help industries reduce:

a)

Crew

b)

Harbor fees

c)

Carbon emissions

d)

Port congestion

72.

Carbon capture systems help by:

a)

Increasing emissions

b)

Storing carbon to reduce emissions

c)

Releasing methane

d)

Burning CO2

73.

The Just Transition ensures economic fairness by balancing costs for:

a)

Only shipowners

b)

Businesses, workers, and port communities

c)

Only governments

d)

Only cadets

74.

A major climate threat mentioned is:

a)

Heavy rain

b)

Global warming leading to disaster

c)

Light winds

d)

Fog

75.

Future seafarers will require more training to work with:

a)

Analog equipment

b)

Paper charts

c)

New low-carbon technologies

d)

Morse code

76.

Decarbonization includes improving building efficiency by:

a)

Reducing staff

b)

Lowering energy consumption

c)

Changing tiles

d)

Decreasing furniture

77.

Agriculture contributes by adopting:

a)

Pesticides only

b)

Sustainable farming practices

c)

Higher methane release

d)

Random irrigation

78.

The fourth propulsion revolution focuses on shifting away from:

a)

Solar power

b)

Conventional bunker fuels

c)

Wind power

d)

Coal only

79.

Achieving decarbonization by 2050 requires:

a)

No cooperation

b)

More pollutants

c)

Investments and global collaboration

d)

Waiting for 2070

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