MDE 6 End of Unit Quiz

MDE 6 End Of Unit Quiz

1 / 12

Question 3: What additional investigation should be conducted if crankcase pressure remains high despite checking the ventilation system and seals?

C) Test the fuel injectors for proper operation

D) Check the alternator for faults

B) Examine the piston rings and cylinder walls for wear or damage

A) Inspect the oil pump for malfunctions

2 / 12

Safety Detection System in Diesel Engine Crankcases

Question: What is a common safety detection system that may be fitted to diesel engine crankcases?

C) Crankcase pressure sensor

D) Turbocharger speed monitor

B) Exhaust gas temperature gauge

A) Oil temperature sensor

3 / 12

Purpose of Relief Valves in Diesel Engine Crankcases

Question: Why are relief valves fitted to diesel engine crankcases?

B) To control the pressure of the engine coolant

A) To regulate the temperature of the engine oil

C) To prevent excessive pressure buildup and avoid crankcase damage

D) To filter out impurities from the engine air

4 / 12

Question 2: If the crankcase pressure is high, what should be checked to ensure proper sealing and pressure control?

D) Radiator efficiency

C) Turbocharger operation

A) Air filter condition

B) Engine gaskets and seals

5 / 12

Question 4: What tool should be used to check for excessive blow-by gases that might be contributing to high crankcase pressure?

C) Oil temperature sensor

A) Digital pressure gauge

D) Exhaust gas analyzer

B) Cylinder compression tester

6 / 12

Crankcase Explosion Relief Door Components

Question: Which of the following lists the MAIN components of a crankcase explosion relief door?

A) Relief door, pressure spring, locking pin, and gasket

C) Relief door, blast shield, hinge mechanism, and latch

B) Relief door, pressure sensor, actuator, and safety valve

D) Relief door, control lever, inspection window, and sealing ring

7 / 12

Further Actions After Crankcase Oil Mist Detector Activation

Question: After shutting down the engine due to activation of the crankcase oil mist detector, what additional actions should the on-watch engineer take?

D) Monitor the engine oil level and top it up if necessary

B) Check for signs of oil leaks and inspect the crankcase ventilation system

A) Immediately restart the engine to clear the fault

C) Clean the engine’s fuel injectors and replace the air filter

8 / 12

Circumstances Causing Relief Valves to Operate in Diesel Engine Crankcases

Question: Under what circumstances might relief valves in a diesel engine crankcase operate?

C) When the engine oil temperature is within the normal operating range

D) During routine engine maintenance and servicing

A) During normal engine startup and shutdown

B) When there is excessive blow-by gas pressure or high crankcase pressure

9 / 12

Checks and Investigations for Increased Crankcase Pressure

Question 1: What is the first step an engineer should take when investigating increased crankcase pressure?

C) Replace the engine oil filter

B) Check the crankcase ventilation system for blockages or malfunctions

D) Verify the engine’s coolant level

A) Inspect the fuel system for leaks

10 / 12

Actions After Crankcase Oil Mist Detector Activation

Question: What actions should the on-watch engineer take when the engine crankcase oil mist detector activates?

C) Check the fuel level and adjust as necessary

B) Shut down the engine immediately and investigate the cause

D) Perform a routine check of the engine’s air intake system

A) Increase engine speed to reduce pressure

11 / 12

Question 5: What is a potential consequence of not addressing high crankcase pressure promptly?

A) Improved engine efficiency

B) Enhanced fuel economy

D) Reduced engine noise

C) Risk of engine damage and potential failure

12 / 12

High Crankcase Pressure Implications and Actions

Question: If the daily engine log shows that the engine crankcase pressure gauge is indicating a much higher value than the normal reading, what are the implications and immediate actions that should be taken?

B) High crankcase pressure may indicate potential issues such as excessive blow-by or ventilation problems; immediately shut down the engine and inspect the crankcase ventilation system and seals.

D) The increased pressure is usually due to low oil levels; top up the engine oil and restart the engine.

C) High crankcase pressure typically results from a faulty fuel pump; replace the fuel pump immediately.

A) The engine may be operating normally; no immediate action is required. Continue to monitor.

Your score is