Three Phase Systems Objective Questions and Answers - Set 02 - ObjectiveBooks

# Practice Test: Question Set - 02

1. In a Y-connected circuit, the magnitude of each line current is
(A) One-third the phase current
(B) Three times the corresponding phase current
(C) Equal to the corresponding phase current
(D) Zero

2. In a balanced three-phase load, each phase has
(A) An equal amount of power
(B) One-third of total power
(C) Two-thirds of total power
(D) A power consumption equal to (√3VL) IL

3. The most common type of ac motor is the
(A) Single-phase induction motor
(B) Two-phase induction motor
(C) Three-phase induction motor
(D) Two-phase squirrel-cage motor

4. The term ‘squirrel-cage’ applies to a type of three-phase ac generator.
(A) True
(B) False

5. Polyphase is characterized by two or more sinusoidal voltages, each having a different phase angle.
(A) True
(B) False

6. If in a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS, what is the magnitude of each line voltage?
(A) 0 V
(B) 90 V
(C) 156 V
(D) 180 V

7. An alternator is an electromechanical ac generator.
(A) True
(B) False

8. In a certain three-wire Y-connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages are
(A) 2,000 V
(B) 6,000 V
(C) 666 V
(D) 3,464 V

9. In a three-phase system, the voltages are separated by
(A) 45°
(B) 90°
(C) 120°
(D) 180°

10. Power is measured in a three-phase load by using an ammeter.
(A) True
(B) False

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