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Practice Test: Question Set - 03

1. In a ∆-connected generator, all of the phase voltages are
    (A) Zero
    (B) Equal in magnitude
    (C) One-third of total
    (D) One-sixth of total

2. A three-phase generator is connected to three 90 Ω load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?
    (A) 0 A
    (B) 1.33 A
    (C) 3.99 A
    (D) 2.66 A

3. In a ∆-connected source driving a ∆-connected load, the
    (A) Load voltage and line voltage are one-third the source voltage for a given phase
    (B) Load voltage and line voltage are two-thirds 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

4. A simple three-phase generator consists of three conductive loops separated by 120°.
    (A) True
    (B) False

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

6. In a three-phase system, when the loads are perfectly balanced, the neutral current is
    (A) Zero
    (B) One-third of maximum
    (C) Two-thirds of maximum
    (D) At maximum

7. In a certain Y-Y 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

8. A balanced load is one in which all the impedances are equal.
    (A) True
    (B) False

9. A single-phase sinusoidal voltage of 120 V is connected to a 90 Ω load. Current in the circuit is
    (A) 13.3 mA
    (B) 133 mA
    (C) 1.33 A
    (D) 6.2 A

10. 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

11. In a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of
    (A) 0°
    (B) 30°
    (C) 60°
    (D) 120°

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