The direction of rotation of a D.C. series motor can be changed by___________?
Correct answer: B. interchanging field terminals
- A. interchanging supply terminals
- B. interchanging field terminals
- C. either of A. and B. above
- D. None of the above
Explanation
Reversing only the field connections reverses the field relative to the armature current and hence reverses torque. Reversing the supply terminals reverses both field and armature currents, leaving the direction unchanged.
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 application requires high starting torque ?
Which D.C. motor will be preferred for machine tools ?
Differentially compound D.C. motors can find applications requiring___________?
No-load speed of which of the following motor will be highest ?
In De Laval steam turbine___________?
The pressure on the two sides of the impulse wheel of a steam turbine_____?