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Questions and Answers
Which of the following phase sequences for a 3-phase motor is usually considered 'backward'?
Which of the following phase sequences for a 3-phase motor is usually considered 'backward'?
- CBA (correct)
- BCA
- ACB
- ABC
What is the commonly considered 'backward' phase sequence for a 3-phase motor?
What is the commonly considered 'backward' phase sequence for a 3-phase motor?
- CBA (correct)
- CAB
- BCA
- ACB
In the context of a 3-phase motor, which phase sequence is typically referred to as 'backward'?
In the context of a 3-phase motor, which phase sequence is typically referred to as 'backward'?
- BCA
- CAB
- CBA (correct)
- ABC
Which of the following phase sequences is commonly labeled as 'backward' in relation to a 3-phase motor?
Which of the following phase sequences is commonly labeled as 'backward' in relation to a 3-phase motor?
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Study Notes
3-Phase Motor Phase Sequence
- In a 3-phase motor, the phase sequence refers to the order in which the voltage in each phase reaches its peak value.
- The most common phase sequence is ABC or RYB (Red, Yellow, Blue), where phase A (or Red) reaches its peak value first, followed by phase B (or Yellow), and then phase C (or Blue).
- The 'backward' phase sequence is ACB or RBY (Red, Blue, Yellow).
- This sequence is considered 'backward' because it is the reverse of the standard sequence.
- This sequence is often referred to as the 'reverse' phase sequence.
- Using the 'backward' phase sequence reverses the motor's direction of rotation.
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Description
Test your knowledge on the phase sequence considered 'backward' in the context of 3-phase motors. Determine the commonly referred 'backward' phase sequence for a 3-phase motor.
