Electrical World

Hello Engineers. Today we are sharing alternator interview questions with answer. Q. 1. What are the two types of turbo-alternators ? Ans.  Vertical and horizontal. Q. 2. How do you compare the two ? Ans. Vertical type requires less floor space and while step bearing is necessary to carry the weight of the moving element, there is very little friction in the main bearings. The horizontal type requires no step bearing, but occupies more space. Q. 3. What is step bearing ? Ans. It consists of two cylindrical cast iron plates which bear upon each other and have a central recess between them. Suitable oil is pumped into this recess under considerable pressure. Q. 4. What is direct-connected alternator ? Ans. One in which the alternator and engine are directly connected. In other words, there is no intermediate gearing such as belt, chain etc. between the driving engine and alternator. Q. 5. What is the difference between direct-connected and direct-coupled units ? Ans...