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

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

$20.00

$25.00

$30.00

$15.00

2 / 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?

2500 RPM

1250 RPM

1500 RPM

1000 RPM

3 / 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

921

896

824

941

4 / 10

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

40 HP

100 HP

50HP

400 HP

5 / 10

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

121

115

125

6 / 10

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

5,600 lbs

3000 lbs

1,120 lbs

3,360 lbs

7 / 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

1200 RP

800 RPM

900 RPM

8 / 10

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

58.9

456

1192.5

265

9 / 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?

137

121

163

10 / 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)

14 pints

10 pints

18 pints

16 pints

Your score is

The average score is 88%

Engine Drivers – Electrical (Section 2)

Electrical systems including safety and troubleshooting

1 / 11

Grounding of appliances and tools is important to

Regulate the wattage

Reduce voltage

Prevent shock

Reduce current

2 / 11

What current does a generator produce?

Alternating

Series

Parallel

Direct

3 / 11

What device is used to restrict voltage?

Fuse

Rectifier

Regulator

Ammeter

4 / 11

In a 12-volt battery there are:

12 cells

3 cells

24 cells

6 cells

5 / 11

When batteries are connected in parallel the voltage

Increases

Decreases

Fluctuates

Remains the same

6 / 11

Fuses are measured in

Watts

Amps

Ohms

Volts

7 / 11

Voltmeters should be connected

In series to the battery or circuit being tested

To a rectifier

In parallel to the battery or circuit being tested

To a regulator

8 / 11

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

Regulator

Voltmeter

Fuse

Rectifier

9 / 11

Resistors are measured in

Amps

Watts

Volts

Ohms

10 / 11

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

Hydrogen

Oxygen

Nitrogen

Helium

11 / 11

What converts AC to DC voltage?

Voltmeter

Fuse

Regulator

Rectifier

Your score is

The average score is 57%

Engine Drivers – General Boat Mechanics (Section 3)

1 / 15

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

Worn bearings/seals

Overheating

Worn impellor

An impellor crack

2 / 15

A Centrifugal pump is also called a

Gravity pump

Impellor pump

Centripetal pump

Rotating pump

3 / 15

An impellor pump is also called a

Centrifugal pump

Gravity pump

Centripetal pump

Rotating pump

4 / 15

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

Reduce friction on the bearing

Keep water out of the hull

Lubricate the bearing

Reduce shaft vibrations

5 / 15

Why are Zincs fitted to heat exchangers?

none of these

to speed the flow of cooling water

to increase the amount of cooling surface

to prevent electrolytic action on the tubes

6 / 15

What might cause an erratic knocking noise in a hydraulic system

Fluid is too warm

Fluid pressure too high

Air bubbles in the system

Fluid pressure too low

7 / 15

Bolts that connect engine/shaft couplings should have

Cotter pins fitted

All of these

Hose clamps to keep them tight

Lock washers fitted

8 / 15

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

9 / 15

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

It needs higher operating pressure

None of the above

This design is easier to clean

It reduces leaks in the tubes

10 / 15

If diesel 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

11 / 15

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

To reduce rudder weight

To make steering easier by reducing pressure on the rudder blade

To increase drag on the rudder

To reduce engine vibrations

12 / 15

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

None of these

Help make the coupling leak-proof

Make a stronger join

Ensure correct alignment

13 / 15

If water is found in the bilge it may indicate that

Fuel line is leaking

Gear box is leaking

Stuffing box is leaking

Hydraulic system is leaking

14 / 15

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

Easier to make

Cheaper to make

Space efficient

Better heat transfer

15 / 15

What does a keel cooler do

Use surrounding water to dissipate engine heat

Cool the keel

Improve air conditioning performance

Reduce drag on the keel

Your score is

The average score is 61%

Engine Drivers – Safety (Section 4)

Covering basic boat safety topics

1 / 12

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

Oxygen and oil

Fuel, heat and hydrogen

Fuel, heat and oxygen

Paper, oily rags and heat

2 / 12

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

Two life jackets per vessel regardless of the number of passengers

Life jackets are only required for those who cannot swim

One wearable life jacket for every person on board

One life jacket for every two people

3 / 12

Pumping bilge water containing oil into the water

doesn't bother turtles

Is an offence within one mile of shore

Is an offence of the oil pollution act

is not considered dangerous.

4 / 12

Where should a boat’s fire extinguisher be stored

At the very bottom of the storage locker

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

In the engine room next to the fuel tank

In a locked compartment to prevent theft

5 / 12

A portable fuel tank should be refilled

with diesel only

leaving room for oil

On the dock out of the boat

In the boat

6 / 12

Any belts on the engine should be:

None of these

Left open to keep cool

Well guarded

Left open for quick adjustments

7 / 12

Cooking gas cylinders should be:

Disconnected when not in use

All of these

On the deck in ventilated compartment

Away from engines

8 / 12

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

Ensuring there are enough snacks for everyone

Checking the sound system

Leaving a float plan with a reliable person on land

Polishing the hull

9 / 12

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

10 / 12

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

Immediately jump into the water to save them

Reverse the engine at full speed

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

Call the Coast Guard before taking any other action

11 / 12

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

Running the engine at high speeds at all times

Keeping all windows and doors tightly shut

Ensuring plenty of fresh air circulation and maintaining exhaust system

Only boating during the daytime

12 / 12

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

Darkening clouds and a sudden shift in wind direction

A sudden drop in water temperature

Seeing longtails flying toward the shore

Increase fish activity near the surface

Your score is

The average score is 78%

Engine Drivers – Hull and Fittings (Section 5)

1 / 9

A cutlass bearing is cooled by

Grease

Freon

Oil

Water

2 / 9

Propellor shafts are typically made of

Stainless steel

Copper

Fibreglass

Bronze

3 / 9

Galvanic action on a boat can be reduced by having

Adequate zincs

A two wire electric system

Zincs at least 1 year old

Stong electrical connections

4 / 9

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

Loss of speed

Decreased motor RPMs

Increased boat speed

Increased motor RPMs

5 / 9

The diameter of a propellor is

Used to attach the blades

Same at the hub and the blade tips

Area of a circle described by the tips

None of these

6 / 9

What does a bilge keel do?

Save fuel

Add speed to the boat

Reduce rolling

Reduce hull drag

7 / 9

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

Easy removal

Air pockets

Expansion and contraction

Water egress

8 / 9

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

Cool the prop shaft

Flush out dirt and grip from the stern gland

Cool the gland packing

None of these

9 / 9

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

Strainer

Anti-galvanic coat of paint

Sea-cock or valve fitted

Brass Seal

Your score is

The average score is 49%

Engine Drivers – Diesel Engines (Section 6)

Questions specific to marine diesel engines

1 / 34

Compression rings are used on:

Water passages

Exhaust manifolds

Oil pumps

Pistons

2 / 34

What could cause the engine to run but lack power?

Fouled prop

Ignition problems

Any of these

Bad fuel

3 / 34

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

4 / 34

Select all the ways you can start a marine diesel engine

Use an extension cord

Use an electric starter motor

Inject fuel by hand into cylinders

Spin the propellor manually while in gear

5 / 34

In a closed cooling system:

The same cooling water is always reused

The salt water flushes the system

No heat exchanger is needed

Lower compression is required

6 / 34

What causes backfires?

Heat exchanger

Low oil pressure

Ignition of unburnt fuel/air mix in exhaust

Fuel runoff valve

7 / 34

The main bearing journal supports the:

Crankshaft

Piston

Camshaft

Oil Pump

8 / 34

In a four-stroke diesel the stroke after compression is

Induction

Power

Exhaust

9 / 34

A silencer/muffler on the exhaust

Reduces combustion termperature

Increases fuel consumption

Reduces exhaust noise

Requires two O-rings

10 / 34

The purpose of a supercharger on an engine is:

To improve oil lubrication on the shaft

To decrease the horsepower of the engine

To increase the horsepower of the engine

To decrease the fuel consumption

11 / 34

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

Hard starting

Excessive lube oil consumption

Increased fuel usage

Low cylinder pressure

12 / 34

Reducing the counterweights on a crankshaft can

Increase speed

Increase RPMs

Improve fuel efficiency

Cause the crankshaft to become unbalanced

13 / 34

High lube oil consumption for an engine may be caused by

None of these

Efficient oil scavenger

Water leaking into the oil sides of the engine

Oil leaking into the water of the cooler

14 / 34

In a four-stroke diesel the stroke before exhaust is

Power

Induction

Compression

15 / 34

What are the strokes of a two-stroke engine?

Induction and exhaust

Power and exhaust

Induction and compression

None of these

16 / 34

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

Worn crankshaft seals

Low oil pressure

Worn injectors

No air in fuel filters

17 / 34

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

High lube oil pressure

High temperature

High compression

Good fuel atomization

18 / 34

A gudgeon pin is also known as a

Straight pin

Wrist pin

Split pin

Power pin

19 / 34

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

Moving upwards, exhaust valve open

Moving upwards, both valves closed

Moving downwards, both valves closed

Moving downwards, inlet valve open

20 / 34

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

1000⁰ F or more

650-900⁰ F

550-800⁰ F

350-550⁰ F

21 / 34

A flywheel ring gear has:

Teeth on the outside

Crankshaft seals

High compression temperature

A water cooling passage

22 / 34

What can cause erratic engine starting?

Bad electric connections

Starter motor problems

Low battery

Any of these

23 / 34

What does a connecting rod do?

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

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

Open and close cylinder valves

Regulate the fuel to air ratio in the cylinders

24 / 34

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

Regulates operating temperature

Adds or removes friction on the crankshaft

Adjusts the fuel to suit the load requirements

Adjusts the throttle setting in the wheelhouse

25 / 34

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

Saltwater exchange

Alternator

Super charger

Heat Exchanger

26 / 34

What is the purpose of a leak-off valve?

Filter lube oil system

Allow transmission system lubrication

Decrease fuel pressure

Return excess fuel to fuel tank

27 / 34

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

Any of these

Malfunctioning pressure gauge

Lube oil pipe leaking

Low lube oil level

28 / 34

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

None of these

To make compression rings more efficient

To cool the crankshaft seals

To force air into the cylinders

29 / 34

In a four-stroke diesel the stroke after induction is

Compression

Exhaust

Power Stroke

30 / 34

Which of these might cause black exhaust smoke

Engine overload

Worn piston rings

Too much lube oil

Cooling water blockage

31 / 34

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

152⁰ F

125⁰ F

57⁰ F

99⁰ F

32 / 34

High lube oil consumption for an engine may be caused by

Worn stem seals

Worn cylinder wall

Worn piston rings

Worn valve guides

33 / 34

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

Fuel seepage into lube oil system

Particle buildup in lube oil

Water seepage into lube oil system

High oil temperature

34 / 34

What does a rocker arm do?

Move the pushrod

Adjust engine timing

Turn the crankshaft

Open or close the valves

Your score is

The average score is 58%

/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 5 – Hull and Fittings

What does a bilge keel do?

Add speed to the boat

Save fuel

Reduce hull drag

Reduce rolling

2 / 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

Sea-cock or valve fitted

Brass Seal

3 / 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

Used to attach the blades

None of these

4 / 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

Flush out dirt and grip from the stern gland

Cool the gland packing

Cool the prop shaft

None of these

5 / 93

Category: Section 5 – Hull and Fittings

Propellor shafts are typically made of

Copper

Fibreglass

Stainless steel

Bronze

6 / 93

Category: Section 5 – Hull and Fittings

Galvanic action on a boat can be reduced by having

A two wire electric system

Zincs at least 1 year old

Stong electrical connections

Adequate zincs

7 / 93

Category: Section 5 – Hull and Fittings

A cutlass bearing is cooled by

Freon

Water

Oil

Grease

8 / 93

Category: Section 5 – Hull and Fittings

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

Decreased motor RPMs

Loss of speed

Increased motor RPMs

Increased boat speed

9 / 93

Category: Section 5 – Hull and Fittings

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

Easy removal

Air pockets

Water egress

Expansion and contraction

10 / 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

824

896

921

941

11 / 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

800 RPM

1200 RP

600 RPM

12 / 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

13 / 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

14 / 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?

163

137

121

15 / 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

10 pints

16 pints

16 / 93

Category: Section 1 – Arithmetic

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

456

1192.5

265

58.9

17 / 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?

1500 RPM

1250 RPM

2500 RPM

1000 RPM

18 / 93

Category: Section 1 – Arithmetic

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

3,360 lbs

1,120 lbs

3000 lbs

5,600 lbs

19 / 93

Category: Section 1 – Arithmetic

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

$30.00

$15.00

$20.00

$25.00

20 / 93

Category: Section 3 – General Boat Mechanics

If diesel is found in the bilge it may indicate that

Fuel line is leaking

Gear box is leaking

Stuffing box is leaking

Hydraulic system is leaking

21 / 93

Category: Section 3 – General Boat Mechanics

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 reduce rudder weight

To increase drag on the rudder

22 / 93

Category: Section 3 – General Boat Mechanics

Bolts that connect engine/shaft couplings should have

All of these

Cotter pins fitted

Lock washers fitted

Hose clamps to keep them tight

23 / 93

Category: Section 3 – General Boat Mechanics

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

Help make the coupling leak-proof

None of these

Make a stronger join

Ensure correct alignment

24 / 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

25 / 93

Category: Section 3 – General Boat Mechanics

A Centrifugal pump is also called a

Gravity pump

Impellor pump

Rotating pump

Centripetal pump

26 / 93

Category: Section 3 – General Boat Mechanics

An impellor pump is also called a

Gravity pump

Centripetal pump

Rotating pump

Centrifugal pump

27 / 93

Category: Section 3 – General Boat Mechanics

What might cause an erratic knocking noise in a hydraulic system

Fluid pressure too low

Fluid pressure too high

Air bubbles in the system

Fluid is too warm

28 / 93

Category: Section 3 – General Boat Mechanics

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

Stuffing box is leaking

Hydraulic system is leaking

Gear box is leaking

Fuel line is leaking

29 / 93

Category: Section 3 – General Boat Mechanics

What does a keel cooler do

Improve air conditioning performance

Cool the keel

Reduce drag on the keel

Use surrounding water to dissipate engine heat

30 / 93

Category: Section 3 – General Boat Mechanics

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

None of the above

This design is easier to clean

31 / 93

Category: Section 3 – General Boat Mechanics

Why are Zincs fitted to heat exchangers?

to increase the amount of cooling surface

to prevent electrolytic action on the tubes

to speed the flow of cooling water

none of these

32 / 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

33 / 93

Category: Section 3 – General Boat Mechanics

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

Space efficient

Cheaper to make

Better heat transfer

Easier to make

34 / 93

Category: Section 3 – General Boat Mechanics

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

Worn bearings/seals

An impellor crack

Worn impellor

Overheating

35 / 93

Category: Section 4 – Safety

Pumping bilge water containing oil into the water

is not considered dangerous.

Is an offence within one mile of shore

doesn't bother turtles

Is an offence of the oil pollution act

36 / 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

37 / 93

Category: Section 4 – Safety

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

Every 9 months

Every 24 months

Every 6 months

Every 12 months

38 / 93

Category: Section 4 – Safety

Cooking gas cylinders should be:

On the deck in ventilated compartment

Away from engines

Disconnected when not in use

All of these

39 / 93

Category: Section 4 – Safety

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

Reverse the engine at full speed

Call the Coast Guard before taking any other action

Immediately jump into the water to save them

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

40 / 93

Category: Section 4 – Safety

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

One life jacket for every two people

Life jackets are only required for those who cannot swim

One wearable life jacket for every person on board

Two life jackets per vessel regardless of the number of passengers

41 / 93

Category: Section 4 – Safety

A portable fuel tank should be refilled

with diesel only

In the boat

On the dock out of the boat

leaving room for oil

42 / 93

Category: Section 4 – Safety

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

Both vessels must stop and wait for a signal

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

The smaller vessel has the right of way

Both vessels should steer to port (left)

43 / 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

44 / 93

Category: Section 4 – Safety

Where should a boat’s fire extinguisher be stored

At the very bottom of the storage locker

In the engine room next to the fuel tank

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

In a locked compartment to prevent theft

45 / 93

Category: Section 4 – Safety

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

2 Minutes

20 Minutes

1 Minute

5 Minutes

46 / 93

Category: Section 4 – Safety

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

Darkening clouds and a sudden shift in wind direction

Increase fish activity near the surface

A sudden drop in water temperature

Seeing longtails flying toward the shore

47 / 93

Category: Section 4 – Safety

Any belts on the engine should be:

Left open for quick adjustments

Well guarded

Left open to keep cool

None of these

48 / 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

Keeping all windows and doors tightly shut

Ensuring plenty of fresh air circulation and maintaining exhaust system

Running the engine at high speeds at all times

49 / 93

Category: Section 2 – Electrical

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

Helium

Nitrogen

Oxygen

Hydrogen

50 / 93

Category: Section 2 – Electrical

Fuses are measured in

Volts

Watts

Amps

Ohms

51 / 93

Category: Section 2 – Electrical

What converts AC to DC voltage?

Voltmeter

Fuse

Rectifier

Regulator

52 / 93

Category: Section 2 – Electrical

Resistors are measured in

Amps

Watts

Ohms

Volts

53 / 93

Category: Section 2 – Electrical

In a 12-volt battery there are:

3 cells

24 cells

6 cells

12 cells

54 / 93

Category: Section 2 – Electrical

Voltmeters should be connected

To a rectifier

In series to the battery or circuit being tested

In parallel to the battery or circuit being tested

To a regulator

55 / 93

Category: Section 2 – Electrical

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

Regulator

Voltmeter

Fuse

Rectifier

56 / 93

Category: Section 2 – Electrical

When batteries are connected in parallel the voltage

Remains the same

Fluctuates

Decreases

Increases

57 / 93

Category: Section 2 – Electrical

What current does a generator produce?

Parallel

Direct

Series

Alternating

58 / 93

Category: Section 2 – Electrical

Grounding of appliances and tools is important to

Regulate the wattage

Reduce current

Prevent shock

Reduce voltage

59 / 93

Category: Section 2 – Electrical

What device is used to restrict voltage?

Rectifier

Ammeter

Regulator

Fuse

60 / 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 injectors

Worn crankshaft seals

61 / 93

Category: Section 6 – Diesel Engines

High lube oil consumption for an engine may be caused by

Oil leaking into the water of the cooler

Efficient oil scavenger

Water leaking into the oil sides of the engine

None of these

62 / 93

Category: Section 6 – Diesel Engines

High lube oil consumption for an engine may be caused by

Worn piston rings

Worn valve guides

Worn cylinder wall

Worn stem seals

63 / 93

Category: Section 6 – Diesel Engines

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

125⁰ F

152⁰ F

99⁰ F

57⁰ F

64 / 93

Category: Section 6 – Diesel Engines

A gudgeon pin is also known as a

Split pin

Power pin

Straight pin

Wrist pin

65 / 93

Category: Section 6 – Diesel Engines

What could cause the engine to run but lack power?

Fouled prop

Any of these

Ignition problems

Bad fuel

66 / 93

Category: Section 6 – Diesel Engines

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

Low cylinder pressure

Excessive lube oil consumption

Hard starting

Increased fuel usage

67 / 93

Category: Section 6 – Diesel Engines

What are the strokes of a two-stroke engine?

None of these

Power and exhaust

Induction and exhaust

Induction and compression

68 / 93

Category: Section 6 – Diesel Engines

What does a rocker arm do?

Turn the crankshaft

Move the pushrod

Adjust engine timing

Open or close the valves

69 / 93

Category: Section 6 – Diesel Engines

What does a connecting rod do?

Open and close cylinder valves

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

70 / 93

Category: Section 6 – Diesel Engines

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

Particle buildup in lube oil

Fuel seepage into lube oil system

High oil temperature

Water seepage into lube oil system

71 / 93

Category: Section 6 – Diesel Engines

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

Any of these

Low lube oil level

Lube oil pipe leaking

Malfunctioning pressure gauge

72 / 93

Category: Section 6 – Diesel Engines

A silencer/muffler on the exhaust

Requires two O-rings

Increases fuel consumption

Reduces combustion termperature

Reduces exhaust noise

73 / 93

Category: Section 6 – Diesel Engines

The main bearing journal supports the:

Crankshaft

Camshaft

Oil Pump

Piston

74 / 93

Category: Section 6 – Diesel Engines

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

Moving downwards, inlet valve open

Moving upwards, exhaust valve open

Moving upwards, both valves closed

Moving downwards, both valves closed

75 / 93

Category: Section 6 – Diesel Engines

In a four-stroke diesel the stroke after compression is

Power

Induction

Exhaust

76 / 93

Category: Section 6 – Diesel Engines

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

None of these

To force air into the cylinders

To make compression rings more efficient

To cool the crankshaft seals

77 / 93

Category: Section 6 – Diesel Engines

The purpose of a supercharger on an engine is:

To decrease the horsepower of the engine

To decrease the fuel consumption

To increase the horsepower of the engine

To improve oil lubrication on the shaft

78 / 93

Category: Section 6 – Diesel Engines

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

350-550⁰ F

550-800⁰ F

1000⁰ F or more

650-900⁰ F

79 / 93

Category: Section 6 – Diesel Engines

In a closed cooling system:

No heat exchanger is needed

The salt water flushes the system

Lower compression is required

The same cooling water is always reused

80 / 93

Category: Section 6 – Diesel Engines

Which of these might cause black exhaust smoke

Worn piston rings

Too much lube oil

Cooling water blockage

Engine overload

81 / 93

Category: Section 6 – Diesel Engines

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

Heat Exchanger

Alternator

Super charger

Saltwater exchange

82 / 93

Category: Section 6 – Diesel Engines

What causes backfires?

Low oil pressure

Fuel runoff valve

Heat exchanger

Ignition of unburnt fuel/air mix in exhaust

83 / 93

Category: Section 6 – Diesel Engines

Compression rings are used on:

Exhaust manifolds

Water passages

Pistons

Oil pumps

84 / 93

Category: Section 6 – Diesel Engines

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

Adjusts the fuel to suit the load requirements

Adjusts the throttle setting in the wheelhouse

Adds or removes friction on the crankshaft

Regulates operating temperature

85 / 93

Category: Section 6 – Diesel Engines

In a four-stroke diesel the stroke before exhaust is

Power

Compression

Induction

86 / 93

Category: Section 6 – Diesel Engines

What can cause erratic engine starting?

Bad electric connections

Any of these

Starter motor problems

Low battery

87 / 93

Category: Section 6 – Diesel Engines

In a four-stroke diesel the stroke after induction is

Power Stroke

Exhaust

Compression

88 / 93

Category: Section 6 – Diesel Engines

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

Every 25 hours

Every 250 hours

Every 55 hours

Every 100 hours or once a year

89 / 93

Category: Section 6 – Diesel Engines

Select all the ways you can start a marine diesel engine

Inject fuel by hand into cylinders

Use an extension cord

Spin the propellor manually while in gear

Use an electric starter motor

90 / 93

Category: Section 6 – Diesel Engines

Reducing the counterweights on a crankshaft can

Increase speed

Improve fuel efficiency

Increase RPMs

Cause the crankshaft to become unbalanced

91 / 93

Category: Section 6 – Diesel Engines

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

High temperature

High compression

High lube oil pressure

Good fuel atomization

92 / 93

Category: Section 6 – Diesel Engines

What is the purpose of a leak-off valve?

Allow transmission system lubrication

Filter lube oil system

Return excess fuel to fuel tank

Decrease fuel pressure

93 / 93

Category: Section 6 – Diesel Engines

A flywheel ring gear has:

High compression temperature

Teeth on the outside

Crankshaft seals

A water cooling passage

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