Engine Drivers

Engine Drivers Practice Exams

Below you can select individual sections or full tests covering content likely to be found on the Bermuda Engine Driver exam. Check out the Engine Drivers License Guide for description of what each section covers.

This content is meant as a study aid only, and the author accepts no responsibility for accuracy. It is work in progress, please report any errors.

You can browse forward and backwards between the questions, and check/change your answers before you press the “Finish” button to see your results.

A special thank you to Cooper for help writing and uploading many of the test questions!

Engine Drivers – Arithmetic (Section 1)

Basic arithmetic. Addition, subtraction, multiplication, division.

1 / 10

The fast ferry carried the following passengers over the weekend, how many passengers did it carry in total?
Friday – 212
Saturday – 422
Sunday – 287

824

921

896

941

2 / 10

Your tanks were full, holding 200 liters of fuel when you departed. You returned with 63 liters of fuel remaining. How much fuel did you use?

163

137

121

3 / 10

You used 23 liters of fuel each day for 5 days. How much fuel did you use in total?

115

125

121

4 / 10

Diesel fuel costs $2.00 per liter. How much does 15 liters cost?

$25.00

$15.00

$20.00

$30.00

5 / 10

A ton is 2,240 lbs. How many pounds is one and a half (1.5) tons?

1,120 lbs

5,600 lbs

3000 lbs

3,360 lbs

6 / 10

You fuel tank holds 265 liters of fuel. How many gallons is this? (1 gallon = 4.5 litres)

456

265

1192.5

58.9

7 / 10

You need 9 quarts of oil for an oil change. You can only get pint-sized tins. How many would you need to buy? (1 quart = 2 pints)

18 pints

10 pints

14 pints

16 pints

8 / 10

Your motor is running at 2,200 RPM. You move the throttle back until it drops to 1,300 RPM. By how many RPMs have you reduced the motor?

600 RPM

800 RPM

1200 RP

900 RPM

9 / 10

Your engine has 8 cylinders and produces 400 HP. How much does each cylinder produce?

50HP

40 HP

400 HP

100 HP

10 / 10

Your engine is fitted with a reduction gearbox with a 2.5 to 1 ratio. If you are running the engine at 2,500 RPM, how fast is the prop shaft spinning?

1250 RPM

2500 RPM

1500 RPM

1000 RPM

Your score is

The average score is 87%

Engine Drivers – Electrical (Section 2)

Electrical systems including safety and troubleshooting

1 / 11

What converts AC to DC voltage?

Regulator

Voltmeter

Rectifier

Fuse

2 / 11

Grounding of appliances and tools is important to

Prevent shock

Reduce current

Regulate the wattage

Reduce voltage

3 / 11

Resistors are measured in

Amps

Volts

Ohms

Watts

4 / 11

When batteries are connected in parallel the voltage

Decreases

Remains the same

Increases

Fluctuates

5 / 11

What device is used to restrict voltage?

Regulator

Rectifier

Ammeter

Fuse

6 / 11

What is used to limit current overload in an electrical system?

Fuse

Regulator

Rectifier

Voltmeter

7 / 11

In a 12-volt battery there are:

12 cells

3 cells

24 cells

6 cells

8 / 11

Voltmeters should be connected

To a regulator

In parallel to the battery or circuit being tested

To a rectifier

In series to the battery or circuit being tested

9 / 11

What current does a generator produce?

Direct

Series

Parallel

Alternating

10 / 11

Fuses are measured in

Watts

Amps

Ohms

Volts

11 / 11

Lead-acid batteries can give off what highly-flammable gas when charging?

Hydrogen

Nitrogen

Helium

Oxygen

Your score is

The average score is 55%

Engine Drivers – General Boat Mechanics (Section 3)

1 / 15

What does a keel cooler do

Cool the keel

Reduce drag on the keel

Improve air conditioning performance

Use surrounding water to dissipate engine heat

2 / 15

What is the main purpose of a gland (stuffing box) on a prop shaft or rudder stock?

Reduce friction on the bearing

Reduce shaft vibrations

Keep water out of the hull

Lubricate the bearing

3 / 15

If lube oil is found in the bilge it may indicate that

Hydraulic system is leaking

Fuel line is leaking

Gear box is leaking

Stuffing box is leaking

4 / 15

In a heat exchanger the fresh water flows on the outside of the tubes because

It reduces leaks in the tubes

It needs higher operating pressure

This design is easier to clean

None of the above

5 / 15

Why are Zincs fitted to heat exchangers?

to prevent electrolytic action on the tubes

to speed the flow of cooling water

to increase the amount of cooling surface

none of these

6 / 15

Why do some rudders have a hole in the blade (known as a fenestrated rudder)

To reduce engine vibrations

To make steering easier by reducing pressure on the rudder blade

To increase drag on the rudder

To reduce rudder weight

7 / 15

Impellor pump water leaks from the area around the shaft may indicate

An impellor crack

Overheating

Worn impellor

Worn bearings/seals

8 / 15

An impellor pump is also called a

Centripetal pump

Rotating pump

Centrifugal pump

Gravity pump

9 / 15

A Centrifugal pump is also called a

Centripetal pump

Gravity pump

Impellor pump

Rotating pump

10 / 15

Mating couplings have a spigot on one side and a socket on the other, in order to

Help make the coupling leak-proof

Ensure correct alignment

None of these

Make a stronger join

11 / 15

Bolts that connect engine/shaft couplings should have

Cotter pins fitted

Lock washers fitted

Hose clamps to keep them tight

All of these

12 / 15

If water is found in the bilge it may indicate that

Hydraulic system is leaking

Gear box is leaking

Stuffing box is leaking

Fuel line is leaking

13 / 15

What might cause an erratic knocking noise in a hydraulic system

Fluid pressure too high

Fluid is too warm

Air bubbles in the system

Fluid pressure too low

14 / 15

If diesel is found in the bilge it may indicate that

Hydraulic system is leaking

Fuel line is leaking

Stuffing box is leaking

Gear box is leaking

15 / 15

Why do some heat exchangers use flat tubes instead of round ones

Easier to make

Cheaper to make

Better heat transfer

Space efficient

Your score is

The average score is 57%

Engine Drivers – Safety (Section 4)

Covering basic boat safety topics

1 / 12

Pumping bilge water containing oil into the water

Is an offence of the oil pollution act

doesn't bother turtles

is not considered dangerous.

Is an offence within one mile of shore

2 / 12

What is the most important safety precaution to take before departing on a boat trip

Checking the sound system

Ensuring there are enough snacks for everyone

Polishing the hull

Leaving a float plan with a reliable person on land

3 / 12

By law, what is the minimum requirement for life jackets (PFDs) on board all vessels?

Life jackets are only required for those who cannot swim

One life jacket for every two people

One wearable life jacket for every person on board

Two life jackets per vessel regardless of the number of passengers

4 / 12

What is the first thing you should do if someone falls overboard

Immediately jump into the water to save them

Call the Coast Guard before taking any other action

Shout "Man Overboard" and keep your eyes on the person at all times

Reverse the engine at full speed

5 / 12

Before a fire can start and continue to burn, there must be present

Fuel, heat and oxygen

Fuel, heat and hydrogen

Oxygen and oil

Paper, oily rags and heat

6 / 12

A portable fuel tank should be refilled

In the boat

On the dock out of the boat

with diesel only

leaving room for oil

7 / 12

When two power-driven vessels are meeting head-on, what is the standard procedure

Both vessels should steer to starboard (right) and pass port-to-port

Both vessels should steer to port (left)

The smaller vessel has the right of way

Both vessels must stop and wait for a signal

8 / 12

Any belts on the engine should be:

Well guarded

Left open for quick adjustments

None of these

Left open to keep cool

9 / 12

What is the primary indicator that dangerous weather, such as a thunderstorm, is approaching?

Darkening clouds and a sudden shift in wind direction

Seeing longtails flying toward the shore

Increase fish activity near the surface

A sudden drop in water temperature

10 / 12

Cooking gas cylinders should be:

All of these

Away from engines

Disconnected when not in use

On the deck in ventilated compartment

11 / 12

Which of the following is the best way to prevent Carbon Monoxide (CO) poisoning on a boat

Only boating during the daytime

Ensuring plenty of fresh air circulation and maintaining exhaust system

Running the engine at high speeds at all times

Keeping all windows and doors tightly shut

12 / 12

Where should a boat’s fire extinguisher be stored

In an accessible location away from the engine, where it can be reached quickly

In a locked compartment to prevent theft

In the engine room next to the fuel tank

At the very bottom of the storage locker

Your score is

The average score is 77%

Engine Drivers – Hull and Fittings (Section 5)

1 / 9

Propellor shafts are typically made of

Bronze

Fibreglass

Copper

Stainless steel

2 / 9

In a water lubricated stern tube, a slight amount of leakage out of the stern gland is allowed to

Flush out dirt and grip from the stern gland

Cool the prop shaft

None of these

Cool the gland packing

3 / 9

The diameter of a propellor is

Same at the hub and the blade tips

Area of a circle described by the tips

Used to attach the blades

None of these

4 / 9

Suitable clearance should be left between the ends of packing rings to allow for

Air pockets

Expansion and contraction

Water egress

Easy removal

5 / 9

Every intake and outflow through the hull below the waterline should have a

Anti-galvanic coat of paint

Strainer

Sea-cock or valve fitted

Brass Seal

6 / 9

A cutlass bearing is cooled by

Grease

Oil

Freon

Water

7 / 9

Galvanic action on a boat can be reduced by having

Stong electrical connections

Zincs at least 1 year old

Adequate zincs

A two wire electric system

8 / 9

What are possible symptoms when a propellor comes loose on it’s shaft

Increased motor RPMs

Loss of speed

Increased boat speed

Decreased motor RPMs

9 / 9

What does a bilge keel do?

Save fuel

Reduce hull drag

Add speed to the boat

Reduce rolling

Your score is

The average score is 47%

Engine Drivers – Diesel Engines (Section 6)

Questions specific to marine diesel engines

1 / 34

What may cause the engine to give off white smoke before cutting out?

Worn injectors

Low oil pressure

No air in fuel filters

Worn crankshaft seals

2 / 34

A flywheel ring gear has:

Crankshaft seals

Teeth on the outside

A water cooling passage

High compression temperature

3 / 34

What is the purpose of a leak-off valve?

Decrease fuel pressure

Return excess fuel to fuel tank

Allow transmission system lubrication

Filter lube oil system

4 / 34

A gudgeon pin is also known as a

Split pin

Straight pin

Wrist pin

Power pin

5 / 34

In a four-stroke diesel the stroke after induction is

Exhaust

Compression

Power Stroke

6 / 34

The main bearing journal supports the:

Crankshaft

Camshaft

Piston

Oil Pump

7 / 34

What causes backfires?

Heat exchanger

Ignition of unburnt fuel/air mix in exhaust

Fuel runoff valve

Low oil pressure

8 / 34

Reducing the counterweights on a crankshaft can

Improve fuel efficiency

Increase RPMs

Cause the crankshaft to become unbalanced

Increase speed

9 / 34

Compression rings are used on:

Water passages

Oil pumps

Exhaust manifolds

Pistons

10 / 34

What is needed for good combustion in a diesel engine cylinder (select all correct answers):

High lube oil pressure

High compression

Good fuel atomization

High temperature

11 / 34

In a four-stroke diesel the stroke before exhaust is

Compression

Power

Induction

12 / 34

High lube oil consumption for an engine may be caused by

None of these

Oil leaking into the water of the cooler

Efficient oil scavenger

Water leaking into the oil sides of the engine

13 / 34

The purpose of a supercharger on an engine is:

To decrease the fuel consumption

To improve oil lubrication on the shaft

To decrease the horsepower of the engine

To increase the horsepower of the engine

14 / 34

A silencer/muffler on the exhaust

Reduces exhaust noise

Reduces combustion termperature

Requires two O-rings

Increases fuel consumption

15 / 34

Which of the following is the most efficient cooling water temperature on a marine diesel engine>

57⁰ F

99⁰ F

125⁰ F

152⁰ F

16 / 34

What cools the water leaving the engine in a closed cooling system?

Alternator

Heat Exchanger

Super charger

Saltwater exchange

17 / 34

Which of these might cause black exhaust smoke

Worn piston rings

Cooling water blockage

Engine overload

Too much lube oil

18 / 34

What can cause erratic engine starting?

Starter motor problems

Bad electric connections

Any of these

Low battery

19 / 34

Worn seals and bearings can result in (select all that apply)

Increased fuel usage

Excessive lube oil consumption

Hard starting

Low cylinder pressure

20 / 34

High lube oil consumption for an engine may be caused by

Worn valve guides

Worn cylinder wall

Worn piston rings

Worn stem seals

21 / 34

What is the purpose of a blower on a two stroke engine?

None of these

To cool the crankshaft seals

To force air into the cylinders

To make compression rings more efficient

22 / 34

How does an old-fashioned, manual governor control the engine speed?

Adjusts the fuel to suit the load requirements

Regulates operating temperature

Adds or removes friction on the crankshaft

Adjusts the throttle setting in the wheelhouse

23 / 34

Approximately how often should you change the oil on a diesel engine?

Every 25 hours

Every 55 hours

Every 250 hours

Every 100 hours or once a year

24 / 34

What is the piston action on the exhaust stroke of a four-stroke engine?

Moving upwards, both valves closed

Moving downwards, inlet valve open

Moving upwards, exhaust valve open

Moving downwards, both valves closed

25 / 34

What could cause the engine to run but lack power?

Any of these

Bad fuel

Fouled prop

Ignition problems

26 / 34

What may cause the oil pressure gauge not to rise after the engine is started?

Malfunctioning pressure gauge

Low lube oil level

Any of these

Lube oil pipe leaking

27 / 34

What does a connecting rod do?

Transfer energy from the piston to the crankshaft during the downwards power stroke

Regulate the fuel to air ratio in the cylinders

Transfer energy from the crankshaft to the piston during the exhaust stroke

Open and close cylinder valves

28 / 34

What is a typical compressed air temperature required for ignition in diesel engines?

350-550⁰ F

650-900⁰ F

550-800⁰ F

1000⁰ F or more

29 / 34

In a four-stroke diesel the stroke after compression is

Power

Induction

Exhaust

30 / 34

Select all the ways you can start a marine diesel engine

Inject fuel by hand into cylinders

Use an electric starter motor

Spin the propellor manually while in gear

Use an extension cord

31 / 34

What are the strokes of a two-stroke engine?

Induction and compression

Power and exhaust

Induction and exhaust

None of these

32 / 34

In a closed cooling system:

No heat exchanger is needed

Lower compression is required

The same cooling water is always reused

The salt water flushes the system

33 / 34

What does a rocker arm do?

Adjust engine timing

Open or close the valves

Move the pushrod

Turn the crankshaft

34 / 34

What can reduce the effectiveness of lube oil? Select all correct answers.

Water seepage into lube oil system

High oil temperature

Particle buildup in lube oil

Fuel seepage into lube oil system

Your score is

The average score is 57%

/93

Engine Drivers – Full Practice Test

Full set of practice questions covering content likely to be encountered on the Bermuda Marine and Ports Engine Drivers Examination

1 / 93

Category: Section 2 – Electrical

What current does a generator produce?

Parallel

Series

Direct

Alternating

2 / 93

Category: Section 2 – Electrical

Fuses are measured in

Amps

Ohms

Volts

Watts

3 / 93

Category: Section 2 – Electrical

What is used to limit current overload in an electrical system?

Rectifier

Regulator

Voltmeter

Fuse

4 / 93

Category: Section 2 – Electrical

What converts AC to DC voltage?

Fuse

Regulator

Rectifier

Voltmeter

5 / 93

Category: Section 2 – Electrical

When batteries are connected in parallel the voltage

Increases

Remains the same

Fluctuates

Decreases

6 / 93

Category: Section 2 – Electrical

What device is used to restrict voltage?

Ammeter

Regulator

Rectifier

Fuse

7 / 93

Category: Section 2 – Electrical

Resistors are measured in

Amps

Ohms

Watts

Volts

8 / 93

Category: Section 2 – Electrical

Lead-acid batteries can give off what highly-flammable gas when charging?

Nitrogen

Oxygen

Helium

Hydrogen

9 / 93

Category: Section 2 – Electrical

Grounding of appliances and tools is important to

Prevent shock

Reduce voltage

Regulate the wattage

Reduce current

10 / 93

Category: Section 2 – Electrical

Voltmeters should be connected

In parallel to the battery or circuit being tested

In series to the battery or circuit being tested

To a regulator

To a rectifier

11 / 93

Category: Section 2 – Electrical

In a 12-volt battery there are:

12 cells

24 cells

3 cells

6 cells

12 / 93

Category: Section 1 – Arithmetic

Diesel fuel costs $2.00 per liter. How much does 15 liters cost?

$25.00

$15.00

$20.00

$30.00

13 / 93

Category: Section 1 – Arithmetic

Your engine has 8 cylinders and produces 400 HP. How much does each cylinder produce?

40 HP

100 HP

50HP

400 HP

14 / 93

Category: Section 1 – Arithmetic

A ton is 2,240 lbs. How many pounds is one and a half (1.5) tons?

5,600 lbs

3,360 lbs

3000 lbs

1,120 lbs

15 / 93

Category: Section 1 – Arithmetic

Your motor is running at 2,200 RPM. You move the throttle back until it drops to 1,300 RPM. By how many RPMs have you reduced the motor?

900 RPM

1200 RP

600 RPM

800 RPM

16 / 93

Category: Section 1 – Arithmetic

You fuel tank holds 265 liters of fuel. How many gallons is this? (1 gallon = 4.5 litres)

265

456

1192.5

58.9

17 / 93

Category: Section 1 – Arithmetic

The fast ferry carried the following passengers over the weekend, how many passengers did it carry in total?
Friday – 212
Saturday – 422
Sunday – 287

896

824

921

941

18 / 93

Category: Section 1 – Arithmetic

Your tanks were full, holding 200 liters of fuel when you departed. You returned with 63 liters of fuel remaining. How much fuel did you use?

121

137

163

19 / 93

Category: Section 1 – Arithmetic

You used 23 liters of fuel each day for 5 days. How much fuel did you use in total?

115

125

121

20 / 93

Category: Section 1 – Arithmetic

You need 9 quarts of oil for an oil change. You can only get pint-sized tins. How many would you need to buy? (1 quart = 2 pints)

14 pints

18 pints

16 pints

10 pints

21 / 93

Category: Section 1 – Arithmetic

Your engine is fitted with a reduction gearbox with a 2.5 to 1 ratio. If you are running the engine at 2,500 RPM, how fast is the prop shaft spinning?

1000 RPM

2500 RPM

1250 RPM

1500 RPM

22 / 93

Category: Section 5 – Hull and Fittings

Propellor shafts are typically made of

Bronze

Fibreglass

Copper

Stainless steel

23 / 93

Category: Section 5 – Hull and Fittings

In a water lubricated stern tube, a slight amount of leakage out of the stern gland is allowed to

Cool the prop shaft

None of these

Flush out dirt and grip from the stern gland

Cool the gland packing

24 / 93

Category: Section 5 – Hull and Fittings

Every intake and outflow through the hull below the waterline should have a

Strainer

Anti-galvanic coat of paint

Brass Seal

Sea-cock or valve fitted

25 / 93

Category: Section 5 – Hull and Fittings

A cutlass bearing is cooled by

Grease

Freon

Water

Oil

26 / 93

Category: Section 5 – Hull and Fittings

Suitable clearance should be left between the ends of packing rings to allow for

Expansion and contraction

Air pockets

Water egress

Easy removal

27 / 93

Category: Section 5 – Hull and Fittings

The diameter of a propellor is

Area of a circle described by the tips

Same at the hub and the blade tips

None of these

Used to attach the blades

28 / 93

Category: Section 5 – Hull and Fittings

What are possible symptoms when a propellor comes loose on it’s shaft

Increased motor RPMs

Loss of speed

Decreased motor RPMs

Increased boat speed

29 / 93

Category: Section 5 – Hull and Fittings

Galvanic action on a boat can be reduced by having

Stong electrical connections

Adequate zincs

Zincs at least 1 year old

A two wire electric system

30 / 93

Category: Section 5 – Hull and Fittings

What does a bilge keel do?

Reduce rolling

Save fuel

Reduce hull drag

Add speed to the boat

31 / 93

Category: Section 4 – Safety

Cooking gas cylinders should be:

On the deck in ventilated compartment

All of these

Disconnected when not in use

Away from engines

32 / 93

Category: Section 4 – Safety

A portable fuel tank should be refilled

with diesel only

leaving room for oil

On the dock out of the boat

In the boat

33 / 93

Category: Section 4 – Safety

Which of the following is the best way to prevent Carbon Monoxide (CO) poisoning on a boat

Only boating during the daytime

Ensuring plenty of fresh air circulation and maintaining exhaust system

Running the engine at high speeds at all times

Keeping all windows and doors tightly shut

34 / 93

Category: Section 4 – Safety

What is the most important safety precaution to take before departing on a boat trip

Polishing the hull

Ensuring there are enough snacks for everyone

Checking the sound system

Leaving a float plan with a reliable person on land

35 / 93

Category: Section 4 – Safety

When two power-driven vessels are meeting head-on, what is the standard procedure

Both vessels should steer to port (left)

The smaller vessel has the right of way

Both vessels must stop and wait for a signal

Both vessels should steer to starboard (right) and pass port-to-port

36 / 93

Category: Section 4 – Safety

What is the primary indicator that dangerous weather, such as a thunderstorm, is approaching?

Increase fish activity near the surface

Seeing longtails flying toward the shore

A sudden drop in water temperature

Darkening clouds and a sudden shift in wind direction

37 / 93

Category: Section 4 – Safety

Any belts on the engine should be:

Left open for quick adjustments

None of these

Well guarded

Left open to keep cool

38 / 93

Category: Section 4 – Safety

After fueling allow the boat to ventilate for at least (check answer)

1 Minute

20 Minutes

2 Minutes

5 Minutes

39 / 93

Category: Section 4 – Safety

Pumping bilge water containing oil into the water

doesn't bother turtles

is not considered dangerous.

Is an offence of the oil pollution act

Is an offence within one mile of shore

40 / 93

Category: Section 4 – Safety

Before a fire can start and continue to burn, there must be present

Paper, oily rags and heat

Fuel, heat and oxygen

Fuel, heat and hydrogen

Oxygen and oil

41 / 93

Category: Section 4 – Safety

What is the first thing you should do if someone falls overboard

Shout "Man Overboard" and keep your eyes on the person at all times

Immediately jump into the water to save them

Reverse the engine at full speed

Call the Coast Guard before taking any other action

42 / 93

Category: Section 4 – Safety

By law, what is the minimum requirement for life jackets (PFDs) on board all vessels?

Life jackets are only required for those who cannot swim

Two life jackets per vessel regardless of the number of passengers

One wearable life jacket for every person on board

One life jacket for every two people

43 / 93

Category: Section 4 – Safety

How often does a refillable portable fire extinguisher need to be inspected/checked?

Every 12 months

Every 24 months

Every 6 months

Every 9 months

44 / 93

Category: Section 4 – Safety

Where should a boat’s fire extinguisher be stored

In the engine room next to the fuel tank

In a locked compartment to prevent theft

At the very bottom of the storage locker

In an accessible location away from the engine, where it can be reached quickly

45 / 93

Category: Section 6 – Diesel Engines

What are the strokes of a two-stroke engine?

Induction and exhaust

Power and exhaust

Induction and compression

None of these

46 / 93

Category: Section 6 – Diesel Engines

What does a connecting rod do?

Transfer energy from the piston to the crankshaft during the downwards power stroke

Transfer energy from the crankshaft to the piston during the exhaust stroke

Regulate the fuel to air ratio in the cylinders

Open and close cylinder valves

47 / 93

Category: Section 6 – Diesel Engines

What is needed for good combustion in a diesel engine cylinder (select all correct answers):

High compression

High temperature

High lube oil pressure

Good fuel atomization

48 / 93

Category: Section 6 – Diesel Engines

In a closed cooling system:

Lower compression is required

The same cooling water is always reused

No heat exchanger is needed

The salt water flushes the system

49 / 93

Category: Section 6 – Diesel Engines

Approximately how often should you change the oil on a diesel engine?

Every 100 hours or once a year

Every 55 hours

Every 250 hours

Every 25 hours

50 / 93

Category: Section 6 – Diesel Engines

High lube oil consumption for an engine may be caused by

Water leaking into the oil sides of the engine

None of these

Oil leaking into the water of the cooler

Efficient oil scavenger

51 / 93

Category: Section 6 – Diesel Engines

Compression rings are used on:

Exhaust manifolds

Oil pumps

Water passages

Pistons

52 / 93

Category: Section 6 – Diesel Engines

A silencer/muffler on the exhaust

Reduces exhaust noise

Increases fuel consumption

Requires two O-rings

Reduces combustion termperature

53 / 93

Category: Section 6 – Diesel Engines

What is a typical compressed air temperature required for ignition in diesel engines?

650-900⁰ F

1000⁰ F or more

550-800⁰ F

350-550⁰ F

54 / 93

Category: Section 6 – Diesel Engines

In a four-stroke diesel the stroke after induction is

Power Stroke

Exhaust

Compression

55 / 93

Category: Section 6 – Diesel Engines

What is the piston action on the exhaust stroke of a four-stroke engine?

Moving upwards, exhaust valve open

Moving downwards, both valves closed

Moving downwards, inlet valve open

Moving upwards, both valves closed

56 / 93

Category: Section 6 – Diesel Engines

What may cause the oil pressure gauge not to rise after the engine is started?

Lube oil pipe leaking

Low lube oil level

Any of these

Malfunctioning pressure gauge

57 / 93

Category: Section 6 – Diesel Engines

What cools the water leaving the engine in a closed cooling system?

Saltwater exchange

Heat Exchanger

Alternator

Super charger

58 / 93

Category: Section 6 – Diesel Engines

What could cause the engine to run but lack power?

Any of these

Bad fuel

Ignition problems

Fouled prop

59 / 93

Category: Section 6 – Diesel Engines

The purpose of a supercharger on an engine is:

To increase the horsepower of the engine

To improve oil lubrication on the shaft

To decrease the horsepower of the engine

To decrease the fuel consumption

60 / 93

Category: Section 6 – Diesel Engines

What can cause erratic engine starting?

Low battery

Any of these

Bad electric connections

Starter motor problems

61 / 93

Category: Section 6 – Diesel Engines

Which of these might cause black exhaust smoke

Cooling water blockage

Too much lube oil

Worn piston rings

Engine overload

62 / 93

Category: Section 6 – Diesel Engines

Worn seals and bearings can result in (select all that apply)

Low cylinder pressure

Increased fuel usage

Hard starting

Excessive lube oil consumption

63 / 93

Category: Section 6 – Diesel Engines

Reducing the counterweights on a crankshaft can

Cause the crankshaft to become unbalanced

Increase RPMs

Increase speed

Improve fuel efficiency

64 / 93

Category: Section 6 – Diesel Engines

High lube oil consumption for an engine may be caused by

Worn stem seals

Worn piston rings

Worn cylinder wall

Worn valve guides

65 / 93

Category: Section 6 – Diesel Engines

In a four-stroke diesel the stroke before exhaust is

Induction

Power

Compression

66 / 93

Category: Section 6 – Diesel Engines

What is the purpose of a leak-off valve?

Return excess fuel to fuel tank

Decrease fuel pressure

Allow transmission system lubrication

Filter lube oil system

67 / 93

Category: Section 6 – Diesel Engines

What does a rocker arm do?

Turn the crankshaft

Open or close the valves

Adjust engine timing

Move the pushrod

68 / 93

Category: Section 6 – Diesel Engines

Which of the following is the most efficient cooling water temperature on a marine diesel engine>

57⁰ F

99⁰ F

152⁰ F

125⁰ F

69 / 93

Category: Section 6 – Diesel Engines

The main bearing journal supports the:

Camshaft

Oil Pump

Piston

Crankshaft

70 / 93

Category: Section 6 – Diesel Engines

What causes backfires?

Heat exchanger

Fuel runoff valve

Ignition of unburnt fuel/air mix in exhaust

Low oil pressure

71 / 93

Category: Section 6 – Diesel Engines

In a four-stroke diesel the stroke after compression is

Power

Exhaust

Induction

72 / 93

Category: Section 6 – Diesel Engines

How does an old-fashioned, manual governor control the engine speed?

Adjusts the throttle setting in the wheelhouse

Regulates operating temperature

Adds or removes friction on the crankshaft

Adjusts the fuel to suit the load requirements

73 / 93

Category: Section 6 – Diesel Engines

A flywheel ring gear has:

Crankshaft seals

High compression temperature

Teeth on the outside

A water cooling passage

74 / 93

Category: Section 6 – Diesel Engines

What may cause the engine to give off white smoke before cutting out?

Low oil pressure

No air in fuel filters

Worn crankshaft seals

Worn injectors

75 / 93

Category: Section 6 – Diesel Engines

What can reduce the effectiveness of lube oil? Select all correct answers.

High oil temperature

Water seepage into lube oil system

Particle buildup in lube oil

Fuel seepage into lube oil system

76 / 93

Category: Section 6 – Diesel Engines

What is the purpose of a blower on a two stroke engine?

To force air into the cylinders

None of these

To make compression rings more efficient

To cool the crankshaft seals

77 / 93

Category: Section 6 – Diesel Engines

Select all the ways you can start a marine diesel engine

Use an extension cord

Spin the propellor manually while in gear

Use an electric starter motor

Inject fuel by hand into cylinders

78 / 93

Category: Section 6 – Diesel Engines

A gudgeon pin is also known as a

Wrist pin

Straight pin

Power pin

Split pin

79 / 93

Category: Section 3 – General Boat Mechanics

Why do some heat exchangers use flat tubes instead of round ones

Cheaper to make

Better heat transfer

Space efficient

Easier to make

80 / 93

Category: Section 3 – General Boat Mechanics

Why are Zincs fitted to heat exchangers?

to prevent electrolytic action on the tubes

none of these

to speed the flow of cooling water

to increase the amount of cooling surface

81 / 93

Category: Section 3 – General Boat Mechanics

What is the main purpose of a gland (stuffing box) on a prop shaft or rudder stock?

Reduce shaft vibrations

Lubricate the bearing

Reduce friction on the bearing

Keep water out of the hull

82 / 93

Category: Section 3 – General Boat Mechanics

What might cause an erratic knocking noise in a hydraulic system

Air bubbles in the system

Fluid is too warm

Fluid pressure too high

Fluid pressure too low

83 / 93

Category: Section 3 – General Boat Mechanics

If lube oil is found in the bilge it may indicate that

Stuffing box is leaking

Fuel line is leaking

Hydraulic system is leaking

Gear box is leaking

84 / 93

Category: Section 3 – General Boat Mechanics

In a heat exchanger the fresh water flows on the outside of the tubes because

This design is easier to clean

It needs higher operating pressure

It reduces leaks in the tubes

None of the above

85 / 93

Category: Section 3 – General Boat Mechanics

If water is found in the bilge it may indicate that

Hydraulic system is leaking

Fuel line is leaking

Stuffing box is leaking

Gear box is leaking

86 / 93

Category: Section 3 – General Boat Mechanics

If diesel is found in the bilge it may indicate that

Gear box is leaking

Hydraulic system is leaking

Fuel line is leaking

Stuffing box is leaking

87 / 93

Category: Section 3 – General Boat Mechanics

Bolts that connect engine/shaft couplings should have

Lock washers fitted

Hose clamps to keep them tight

Cotter pins fitted

All of these

88 / 93

Category: Section 3 – General Boat Mechanics

Mating couplings have a spigot on one side and a socket on the other, in order to

Make a stronger join

Help make the coupling leak-proof

Ensure correct alignment

None of these

89 / 93

Category: Section 3 – General Boat Mechanics

An impellor pump is also called a

Centrifugal pump

Rotating pump

Centripetal pump

Gravity pump

90 / 93

Category: Section 3 – General Boat Mechanics

A Centrifugal pump is also called a

Rotating pump

Centripetal pump

Gravity pump

Impellor pump

91 / 93

Category: Section 3 – General Boat Mechanics

Why do some rudders have a hole in the blade (known as a fenestrated rudder)

To increase drag on the rudder

To reduce rudder weight

To make steering easier by reducing pressure on the rudder blade

To reduce engine vibrations

92 / 93

Category: Section 3 – General Boat Mechanics

Impellor pump water leaks from the area around the shaft may indicate

Worn impellor

Worn bearings/seals

An impellor crack

Overheating

93 / 93

Category: Section 3 – General Boat Mechanics

What does a keel cooler do

Use surrounding water to dissipate engine heat

Reduce drag on the keel

Cool the keel

Improve air conditioning performance

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