6.a. An a-c electrolytic capacitor is placed in the auxiliary-winding circuit of a single-phase motor when A. capacitance should be permanently included in the motor circuit. B. capacitance is needed for the starting period only. C. a leading current is required in the main winding. D. a lagging current is required in the auxiliary winding. 6.b. The motor best suited for driving a shaft-mounted fan in an air-conditioner which requires a low operating current is the A. permanent-split capacitor motor. B. shaded-pole motor. C. concentrated-pole universal motor. D. brush-shifting repulsion motor.

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Single Phase Induction Motor

The single-phase induction motor or engine consists of a single rotating phase in the stator and a rotating cage in the rotor. When phase one supply is connected to the stator winding, a magnetic field is generated. In the pulsating field, the rotor does not rotate due to inertia. So, a single-phase import motor does not start and requires some initial methods.