Electrical Engineering XYZ MCQs
Which of the following machines have highest power factor with respect to magnetizing current:
- Semi closed slot type machine
- Open slot type machines
- Closed slot type machines
- Any of the above
Correct answer: 3. Closed slot type machines
Explanation: The correct answer is “Closed slot type machines.”
Power factor is a measure of how effectively electrical power is being converted into useful work output. In the context of electric machines, such as induction motors or transformers, magnetizing current is the current required to establish the magnetic field in the core.
The power factor is influenced by the phase relationship between the voltage and current waveforms. In closed slot type machines, the magnetic circuit is more closed, leading to lower magnetic leakage and improved power factor. Closed slot designs are often associated with better performance in terms of power factor compared to open slot types.
Therefore, among the options provided, closed slot type machines generally have the highest power factor with respect to magnetizing current.