AC 3 PHASE INDUCTION MOTOR - Practice Mode

1) Which principle the current sensing single phasing preventor works?

Equal currents with balanced loads Different currents with balanced loads Equal currents with unbalanced loads Different currents with unbalanced loads

Correct Answer: Equal currents with balanced loads

2) What is called, if the order of 3 phase supply voltages reach the maximum value?

Phase relation Phase sequence Single phasing Phase distortion

Correct Answer: Phase sequence

3) What is the purpose of single phasing preventor?

Protects the motor by stopping automatically under balanced load Provides three phase supply in sequence order Prevents the motor from short circuit fault Prevent the motor from over load

Correct Answer: Protects the motor by stopping automatically under balanced load

4) Which type of single phase preventer is used for the motor with constant load?

Mechanical single phasing preventor with bimetal relay Mechanical single phasing preventer with coils Voltage sewing single phasing preventer Current sewing single phasing preventer

Correct Answer: Current sewing single phasing preventer

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