Electrical Engineering XYZ MCQs
Which of the following regarding slot and leakage flux is correct:
- Semi closed slot – Moderate leakage flux
- Open slot – Less leakage flux
- Closed slot – High leakage flux
- All of these
Correct answer: 4. All of these
Explanation: Here’s the explanation for the options and why the correct answer is as stated:
- Semi-closed slot – Moderate leakage flux: Semi-closed slots partially restrict the path of magnetic lines of force compared to open slots. This partial closure tends to increase the leakage flux compared to open slots but not as much as in closed slots. Therefore, it can be said to have a moderate level of leakage flux, which makes this statement also correct.
- Open slot – Less leakage flux: Open slots provide the least restriction to the magnetic lines of force passing through the slots of a machine (like an electric motor or generator). This allows the flux to follow the intended path through the air gap with minimal leakage. Hence, open slots indeed have less leakage flux compared to other slot types. This statement is also correct.
- Closed slot – High leakage flux: Closed slots significantly restrict the path of magnetic lines of force, causing more flux to leak through alternative paths rather than following the intended path across the air gap. This increases the leakage flux significantly. Thus, closed slots are associated with high leakage flux. This statement is correct.
Given the statements provided, all of them correctly describe the relationship between slot design and the amount of leakage flux:
All of these
This is because each type of slot affects the amount of leakage flux in the way described by each statement.