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MCQs

Total Questions : 71 | Page 2 of 8 pages
Question 11. In a ∆-connected source driving a ∆-connected load, the
  1.    Load voltage and line voltage are one-third the source voltage for a given phase
  2.    Load voltage and line voltage are two-thirds the source voltage for a given phase
  3.    Load voltage and line voltage cancel for a given phase
  4.    Load voltage, line voltage, and source phase voltage are all equal for a given phase
 Discuss Question
Answer: Option D. -> Load voltage, line voltage, and source phase voltage are all equal for a given phase
Question 12. In a Y-Y source/load configuration, the
  1.    Phase current, the line current, and the load current are all equal in each phase
  2.    Phase current, the line current, and the load current are 120° Ωut of phase
  3.    Phase current and the line current are in phase, and both are 120° Ωut of phase with the load current
  4.    Line current and the load current are in phase, and both are out of phase with the phase current
 Discuss Question
Answer: Option A. -> Phase current, the line current, and the load current are all equal in each phase
Question 13. In a three-phase system, when the loads are perfectly balanced, the neutral current is
  1.    Zero
  2.    One-third of maximum
  3.    Two-thirds of maximum
  4.    At maximum
 Discuss Question
Answer: Option A. -> Zero
Question 14. The most common type of ac motor is the
  1.    Single-phase induction motor
  2.    Two-phase induction motor
  3.    Three-phase induction motor
  4.    Two-phase squirrel-cage motor
 Discuss Question
Answer: Option C. -> Three-phase induction motor
Question 15. In a ∆-connected generator, all of the phase voltages are
  1.    Zero
  2.    Equal in magnitude
  3.    One-third of total
  4.    One-sixth of total
 Discuss Question
Answer: Option B. -> Equal in magnitude
Question 16. In a Y-connected circuit, the magnitude of each line current is
  1.    One-third the phase current
  2.    Three times the corresponding phase current
  3.    Equal to the corresponding phase current
  4.    Zero
 Discuss Question
Answer: Option C. -> Equal to the corresponding phase current
Question 17. 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
  1.    3 A
  2.    6 A
  3.    9 A
  4.    27 A
 Discuss Question
Answer: Option C. -> 9 A
Question 18. If in a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS, what is the magnitude of each line voltage?
  1.    0 V
  2.    90 V
  3.    156 V
  4.    180 V
 Discuss Question
Answer: Option C. -> 156 V
Question 19. Polyphase is characterized by two or more sinusoidal voltages, each having a different phase angle.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 20. In a ∆-connected source feeding a Y-connected load
  1.    Each phase voltage equals the difference of the corresponding load voltages
  2.    Each phase voltage equals the corresponding load voltage
  3.    Each phase voltage is one-third the corresponding load voltage
  4.    Each phase voltage is 60° Ωut of phase with the corresponding load voltage
 Discuss Question
Answer: Option A. -> Each phase voltage equals the difference of the corresponding load voltages

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