MDE 14 End of Unit Quiz

MDE 14 End Of Unit Quiz

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Question 2:
What is the function of the starting air interlock in a direct air start medium-speed diesel engine?

C) To prevent starting if the main starting air valve is not fully open

D) To ensure that the crankcase doors are properly secured

B) To ensure that the fuel valves are in the open position

A) To prevent the engine from starting if the cooling water temperature is too low

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Question 2:
Which of the following is a key maintenance task for the air motor to prevent corrosion and ensure long-term reliability?

B) Cleaning the fuel injectors

A) Lubricating the air motor components regularly

D) Adjusting the valve clearances

C) Replacing the air intake filter

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Question 3: During an attempt to start a large marine diesel engine, you find that no air is being delivered to the cylinders. What could be a likely cause?

C. Closed starting air supply valve.

A. Faulty fuel pump.

D. Low cylinder compression.

B. Exhaust valve stuck in the open position.

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Question 4:
Which safety device in the air starting system is responsible for releasing excess air to the atmosphere in case of an overpressure condition?

D) Crankcase relief valve

C) Starting air valve

B) Air distributor

A) Safety valve

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Question 1:
At what approximate crank angle does the air start valve typically begin to open on a four-stroke diesel engine during the starting process?

A) 0° (TDC)

D) 360° (BDC)

B) 90° after TDC

C) 270° after TDC

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Question 3:

Which interlock is commonly found in a diesel engine hydraulic oil start system to ensure safe operation?

A) Engine oil pressure switch

D) Fuel pressure regulator

B) Hydraulic fluid level sensor

C) Coolant temperature gauge

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Question 1:
Which of the following is a safety device commonly fitted to the air starting system of a large medium-speed marine diesel engine?

D) Governor actuator

B) Exhaust gas temperature sensor

A) Pressure relief valve

C) Fuel oil purifier

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Question 3:
In an air starting system, the interlock system is designed to:

A) Ensure that the engine cannot be started unless the turning gear is disengaged

B) Maintain constant air pressure in the starting air system

D) Monitor the lube oil temperature during engine start-up

C) Regulate the amount of fuel injected during startup

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Question 6:

Which component prevents the starter motor from operating when the engine is already running?

C) Neutral safety switch

A) Starter relay

D) Starter inhibitor switch

B) Ignition switch

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Question 5:

What happens when the starter switch is turned on in a solenoid-operated starting system?

B) The solenoid engages the starter motor and the engine cranks

C) The alternator charges the battery

A) The battery is disconnected from the starter motor

D) The fuel pump is deactivated

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Question 3:
How does the timing of the air start valve's opening relate to the inlet and exhaust valves' operation in a four-stroke diesel engine?

D) The air start valve opens when the inlet valve is closed and the exhaust valve is open

B) The air start valve opens when the inlet valve is open and the exhaust valve is closed

A) The air start valve opens when both inlet and exhaust valves are closed

C) The air start valve opens when both the inlet and exhaust valves are open

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Question 4:

Which of the following describes the role of the starter motor in the electric starting system?

D) To regulate the engine’s fuel injection

C) To crank the engine and initiate combustion

B) To provide cooling to the engine

A) To generate electrical power for the ignition system

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