 A. 45°
 B. 90°
 C. 120°
 D. 180°
Electrical Engineering (MCQs)
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In a threephase system, the voltages are separated by

In a ∆connected source driving a ∆connected load, the
 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 balanced load is one in which all the impedances are equal.
 A. True
 B. False

In a Yconnected source feeding a ∆connected load,
 A. Each phase of the load has onethird of the full line voltage across it
 B. Each phase of the load has twothirds of the full line voltage across it
 C. Each phase of the load has the full line voltage across it
 D. Each phase of the load has a voltage across it equal to √3

In a ∆connected generator, there is a 120° difference between each line current and the nearest phase current.
 A. True
 B. False

In a certain YY system, the source phase currents each have a magnitude of 9 A. The magnitude of each load current for a balanced load condition is
 A. 3 A
 B. 6 A
 C. 9 A
 D. 27 A

The stator is the rotating assembly in a generator or motor.
 A. True
 B. False

In a YY source/load configuration, the
 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° Ωut of phase
 C. Phase current and the line current are in phase, and both are 120° Ωut 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

Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by
 A. Certain constant phase angles
 B. Certain constant frequencies
 C. Certain constant voltages
 D. Certain constant currents

A constant load power means a uniform conversion of
 A. Mechanical to electrical energy
 B. Electrical to mechanical energy
 C. Current to voltage
 D. Voltage to current