The most common type of ac motor is the
Answer: Option C
Explanation:
Because of variable speed 3-phase induction motors are mostly used.
In a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of
Answer: Option B
As we know the phase difference between any 2 phase is 120 deg, the phase angle between line voltage and phase voltage is 30 degree.
Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by
Answer: Option A
Because the electrical difference in 3phase is 120degrees.
Compare the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 Ω.
i=v/r =120/15 =8A but in single phase= 2*3phase current =2*8 =16A
A single-phase sinusoidal voltage of 120 V is connected to a 90 Ω load. Current in the circuit is
I=V/R=120/90=1.333A
