EMAR302: Bedplates & Crankshafts

Create an image of a detailed cross-section of a large marine engine, highlighting the bedplate and crankshaft, with labels showing various components such as tie bolts, main bearings, and counterweights.

Master the Mechanics: Bedplates & Crankshafts Quiz

Test your knowledge on the critical components of engine design with the Bedplates & Crankshafts Quiz. This quiz covers essential aspects of engine mechanics, providing a comprehensive examination of topics that are vital for engineering students and professionals alike.

Whether you're preparing for certification or just looking to reinforce your understanding, this quiz will challenge your grasp of:

Crankshaft dynamics
Bedplate functions
Engine assembly and maintenance
Safety protocols in engine operation

10 Questions2 MinutesCreated by EngineeringAce134

The main function of the tie bolts in a large two stroke engine is to:

Stiffen the bedplate in the region of the main bearings

Accept most of the tensile loading from the firing forces when in operation

Mount the engine bedplate securely to the hull of the vessel

Connect the crosshead securely to the piston rod assembly

The main reason counterweights are added to a crankshaft is to:

Minimise the piston side thrust

Minimise the piston end thrust

Provide uniform loading and wear of the main bearings

Increase the strength of the crank webs

A crankshaft whose centre of gravity coincides with its centre line is said to be:

Dynamically balanced

Statically balanced

Counter balanced

Resonantly balanced

In fully-built and semi-built crankshafts, how can any slippage to the shrink fit be identified?

By inspecting the locking arrangement provided

By checking thet the dowels and bolts are still intact

By checking the reference marks are in alignment

Through checking the performance of the engine.

Which of the following is one of the major advantages of resin chocking over cast iron chocking of an engine bedplate?

Better vibration damping characteristics

Better compressive strength

There is 100% contact, with no surface preparation required

None of these answers is correct

Crankshaft deflection readings are taken in order to get a positive indication of:

Worn main bearing journals

Torsional bedplate distortion

Worn crankshaft thrust bearings

Bearing shell shim dimensions

The possibility of damage from operating an engine at critical speed is reduced with the aid of:

Elastic engine mounts

A vibration damper

A cast iron bedplate with good flexible properties

The fuel governor will not allow the engine to run at critical speed

With regards to a crankcase explosion, which of these statements is incorrect:

The oil-air mixture needs to be above the LEL and the HEL

Crankcase explosion doors are required at every unit on large engines

The primary explosion is more severe than the secondary explosion

The wire gauze on the crankcase doors helps to reduce flame energy

A modern oil mist detector head works on the principle of:

Light obcsuring a photo-cell

Photo-luminescence

Light scatter around a barrier

Two lights that change brightness when oil is present

Why are lightening holes incorporated into large main engine bedplate?

In order to reduce the weight of the bedplate

In order for lighting to be installed within the bedplate

In order for the oil-mist detectors to be fitted

In order for the oil to drain back to the sump of the engine

EMAR302: Bedplates & Crankshafts

Master the Mechanics: Bedplates & Crankshafts Quiz

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