Electrician Red Seal · Question
What is the primary method of controlling the speed of a three-phase squirrel cage induction motor?
For squirrel cage induction motors, varying the applied frequency (using a Variable Frequency Drive - VFD) is the most effective and common method to achieve pr
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Question: What is the primary method of controlling the speed of a three-phase squirrel cage induction motor?
Answer options:
- Varying the stator resistance.
- Varying the rotor resistance. ✅ Varying the applied frequency (VFD).
- Varying the DC excitation to the rotor.
Correct answer: Varying the applied frequency (VFD).
Explanation: For squirrel cage induction motors, varying the applied frequency (using a Variable Frequency Drive - VFD) is the most effective and common method to achieve precise speed control while maintaining good efficiency.
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- A residential garage is to be wired with a 15 A, 120 V duplex receptacle. According to the Canadian Electrical
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