Question

For marine engine shafts subjected to high radial and axial thrust loads, which one of the following types of bearings is the most suitable?

• A. Deep groove ball
• B. Sealed ball
• C. Tapered roller
• D. Needle

Hint:

For applications involving both radial and axial thrust, tapered roller bearings are the best choice due to their ability to handle both types of loads effectively.

Answer 1

The Correct Option is C

Marine engine shafts experience high radial and axial thrust loads, which require bearings that can support both types of loads effectively. 
Step 1: Definition of bearing types.
Deep groove ball bearings (Option A) are good for radial loads but are not ideal for handling significant axial thrust.
Sealed ball bearings (Option B) are used to prevent contamination but are not particularly suited for high thrust loads. 
Tapered roller bearings (Option C) are designed to handle both radial and axial loads effectively, making them the most suitable choice for marine engine shafts under high radial and axial thrust. 
Needle bearings (Option D) are compact and suitable for smaller spaces but are generally not ideal for high thrust loads. 
Step 2: Analyze each option. 
(A) Incorrect. Deep groove ball bearings are not designed to handle significant axial thrust. 
(B) Incorrect. Sealed ball bearings are not ideal for high radial and axial thrust loads. 
(C) Correct. Tapered roller bearings are designed specifically for both radial and axial loads, making them the most suitable option.
(D) Incorrect. Needle bearings are used for lighter loads and are not ideal for high axial thrust.