1.Why gearbox fitted to medium speed marine engines?Why propeller not connected to engine directly to run at high speed?

2.How to test a egine overspeed shutdown?

3.What are the advantages and disadvantages of helical gear?

4.What are the safety devices found on a direct on line motor starter?

Hi, murali7!

I just moved your questions from Introductions to this more appropriate forum area. In Introductions, that's where people greet each other. We don't ask questions there.

What do you think might be good answers to the questions that you've asked, please? If we simply gave you answers to the questions, how would that be helping you to learn how to arrive at the answers in order for you to learn on your own the best?

Please click on the following link for more information as to how to post homework questions here.

Ask Me Help Desk - Announcements in Forum : Homework Help (https://www.askmehelpdesk.com/other-subjects/announcement-font-color-ff0000-u-b-read-first-expectations-homework-help-board-b-u-font.html)

Thanks!