# 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°

**View All Answers**

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