CHIEF ENGINEER Unit 14 Q1

Correct Answer:
A) Cylinder liner

Explanation:
The cylinder liner is calibrated during an overhaul to ensure a smooth surface for piston movement, which is critical for effective combustion and engine efficiency.

Correct Answer:
B) Main bearings

Explanation:
Main bearings often contain tin and lead alloys, so elevated levels of these metals in the oil sample may indicate bearing wear.

Correct Answer:
B) Fuel injector

Explanation:
The fuel injector is calibrated to maintain accurate fuel injection timing, which is essential for optimal combustion within the cylinder.

Correct Answer:
C) Connecting rod bearings

Explanation:
Connecting rod bearings are made from materials containing tin and lead, so high levels of these elements in oil suggest possible wear in these bearings.

Correct Answer:
B) Crankshaft

Explanation:
The crankshaft is calibrated during overhauls to ensure it effectively converts the reciprocating motion of the piston into rotational energy, which drives the engine.

Correct Answer:
A) Liner

Explanation:
The liner is calibrated to provide the correct clearance for piston movement and to minimize wear, which helps in temperature control and efficient engine performance.

Correct Answer:
B) Piston rings

Explanation:
Piston rings are calibrated to ensure a tight seal between the piston and the cylinder liner, preventing blow-by and maintaining pressure for efficient engine operation.

Correct Answer:
B) Main bearings

Explanation:
Main bearings contain tin and lead and are a common source of these metals in oil samples if wear or degradation occurs.

Correct Answer:
A) Cylinder head

Explanation:
The cylinder head, which is exposed to high temperatures and pressures, is calibrated to maintain structural integrity and proper sealing with the cylinder liner.

Correct Answer:
A) Cylinder liner

Explanation:
Cylinder liners do not typically contain tin and lead, so they are unlikely to be the source of these metals in the oil sample.