Q.

If a 3-phase induction motor is started when one of the phases is not available, then the motor

• AWill hum but not start
• BWill continue to operate satisfactory on load below 57.7% of rated load if brought up to speed by some external means
• CWill operate under reduced load but usually with considerable vibration in case of wound rotor motor is brought up to speed by some external means
• DAll of the above