If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to______________?
Correct answer: A. reverse the field connections
- A. reverse the field connections
- B. increase the field resistance
- C. increase the speed of primemover
- D. check armature insulation resistance
Explanation
A self-excited generator needs residual magnetism of the correct polarity to begin voltage build-up; reversing the field connections corrects an opposing field polarity. Increasing speed may help marginal build-up, but it is not the first corrective check in this standard case.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
Practise Electrical Machines
1,061 free Electrical Machines MCQs from Electrical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Electrical Engineering questions like this
Electrical Engineering is on 2 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Electrical Machines questions
Which of the following generating machine will offer constant voltage on all loads?
Which of the following generators will be preferred if they are required to be run in parallel?
When two D.C. generators are running in parallel an equilizer bar is used______________?
The main factor which leads to unstable parallel operation of flat and over compounded generators is_____________?
When two D.C. series generators are running in parallel, an equilizer bar is used________________?
Shunt generators are most suited for stable parallel operation because of their______________?