Which of the following are properties of balanced 3-phase power systems? Select

**all**that apply.A. All 3-phase voltages have equal magnitude and are 90° apart.

B. Three-phase systems transmit alternating currents.

C. Neutral wire, if present, carries no current.

D. Three-phase systems can produce rotating magnetic field.

E. In a wye connection, the line voltage equals the phase voltage.

If the complex power is 7,500 VA with a power factor of 0.778 lagging, the reactive power (VAR) is most nearly:

Assume a 120-V, single-phase source is feeding a load of $$7+j12 (Omega)$$ through a line impedance of $$2+j0 (Omega)$$. The magnitude (V) of the voltage drop across the line is most nearly:

A. 16

B. 27

C. 97

D. 111

A balanced 3-phase load is rated at 100 kVA and 0.65 pf lagging. A purely capacitive load is added in parallel with the inductive load to improve the power factor to 0.9 lagging. The capacitive load must supply a reactive power (kvar) that is most nearly:

A. 76

B. 65

C. 45

D. 31

The following were installed in an AC circuit:

An ammeter, which reads 15 $$A_(rms)$$

A voltmeter, which reads 115 $$V_(rms)$$

A wattmeter, which reads 1,500 WThe power factor of the circuit is most nearly:

A. -0.87

B. -0.5

C. 0.5

D. 0.87

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