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?

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

D) To ensure that the crankcase doors are properly secured

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

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

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Question 6:

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

D) Starter inhibitor switch

C) Neutral safety switch

A) Starter relay

B) Ignition switch

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Question 4:

What role does the hydraulic accumulator play in the hydraulic oil start system of a diesel engine?

B) It regulates the fuel supply to the engine

A) It stores excess hydraulic fluid for future use

C) It maintains hydraulic pressure for starting the engine

D) It filters impurities from the hydraulic oil

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Question 1: When initiating the start sequence on a large medium-speed marine diesel engine with individual air starting valves, the engine fails to start. Which of the following is the first check you should perform?

B. Check if the main starting air receiver is pressurized.

A. Check the air start valve timing.

D. Check the lube oil level in the sump.

C. Check the condition of the fuel injectors.

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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?

A) Pressure relief valve

D) Governor actuator

B) Exhaust gas temperature sensor

C) Fuel oil purifier

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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?

B) 90° after TDC

C) 270° after TDC

A) 0° (TDC)

D) 360° (BDC)

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Question 4:
What is a common sign that the air motor’s exhaust port needs to be inspected or cleaned?

A) Reduced engine starting speed

B) Increased air pressure in the system

C) Unusual noise from the air motor

D) Oil leaks around the air motor housing

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Question 3:

How is the solenoid activated in a solenoid-operated starting system?

C) By a push-button on the dashboard

A) By a mechanical switch

D) By a current flowing through its coil

B) By an electronic control unit (ECU)

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Question 2:
What is the primary function of the non-return valve in the air starting system of a medium-speed marine diesel engine?

C) To measure exhaust gas temperature

B) To regulate the fuel injection timing

D) To control the flow of cooling water

A) To prevent backflow of air into the receiver

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Question 2:

Which of the following components is typically included in a diesel engine hydraulic oil start system?

B) Fuel filter

A) Hydraulic pump

C) Air compressor

D) Turbocharger

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Question 4: What should be inspected if there is air leakage during the start sequence of a marine diesel engine?

B. Starting air valve condition.

D. Turbocharger speed.

A. Fuel injection timing.

C. Piston ring clearance.

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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

A) Safety valve

B) Air distributor

C) Starting air valve

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