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Which statement is correct about a single phase motor?
It is always less expensive than three-phase motors
If it is a repulsion-induction type, it offers high efficiency
Capacitor-start types have high starting torque and current
All single-phase motors have the same number of poles
The correct answer is: Capacitor-start types have high starting torque and current
The statement about capacitor-start types having high starting torque and current is accurate because capacitor-start motors are specifically designed to provide a boost in starting torque. This is accomplished through the use of a capacitor in the starting circuit, which creates a phase shift in the electrical current. As a result, there is an increase in the starting torque when the motor is initiated, making it highly effective for applications where high starting torque is necessary, such as in air compressors, fans, and pumps. In terms of starting current, capacitor-start motors do tend to draw more current at startup compared to other types. This characteristic is due to the initial surge needed to overcome inertia before the motor reaches its running speed. Therefore, option C highlights a crucial feature of capacitor-start motors that is relevant in practical applications and helps in understanding their operational advantages. Other statements might not accurately reflect the characteristics of single-phase motors. For instance, while single-phase motors can be less expensive than three-phase motors in some cases, this is not universally true across all models and brands. Efficiency should be noted as varying significantly among different types of single-phase motors, regardless of the specific type mentioned. Lastly, the number of poles varies among single-phase motors, which is determined by their design and intended operating