EEE :: Three  Phase Systems in Power Applications

In a threephase system, when the loads are perfectly balanced, the neutral current is

In a connected source driving a connected load, the

In a certain threewire Yconnected generator, the phase voltages are 2 kV. The magnitudes of the line voltages are

In a connected source feeding a Yconnected load,

In a YY source/load configuration, the

In a Yconnected circuit, the magnitude of each line current is

A constant load power means a uniform conversion of

A twophase generator is connected to two 90 load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?

A singlephase sinusoidal voltage of 120 V is connected to a 90 load. Current in the circuit is
A.
load voltage and line voltage are onethird the source voltage for a given phase

B.
load voltage and line voltage are twothirds the source voltage for a given phase

C.
load voltage and line voltage cancel for a given phase

D.
load voltage, line voltage, and source phase voltage are all equal for a given phase

A.
phase current, the line current, and the load current are all equal in each phase

B.
phase current, the line current, and the load current are 120° out of phase

C.
phase current and the line current are in phase, and both are 120° out of phase with the load current

D.
line current and the load current are in phase, and both are out of phase with the phase current
