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MCQs

Total Questions : 71 | Page 3 of 8 pages
Question 21. In a three-phase system, the voltages are separated by
  1.    45°
  2.    90°
  3.    120°
  4.    180°
 Discuss Question
Answer: Option C. -> 120°
Question 22. Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by
  1.    Certain constant phase angles
  2.    Certain constant frequencies
  3.    Certain constant voltages
  4.    Certain constant currents
 Discuss Question
Answer: Option A. -> Certain constant phase angles
Question 23. In a certain three-wire Y-connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages are
  1.    2,000 V
  2.    6,000 V
  3.    666 V
  4.    3,464 V
 Discuss Question
Answer: Option D. -> 3,464 V
Question 24. In a balanced three-phase load, each phase has
  1.    An equal amount of power
  2.    One-third of total power
  3.    Two-thirds of total power
  4.    A power consumption equal to (√3VL) IL
 Discuss Question
Answer: Option A. -> An equal amount of power
Question 25. A simple two-phase generator consists of two conductive loops separated by 90°, rotating in a magnetic field.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 26. A balanced load is one in which all the impedances are equal.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 27. A constant load power means a uniform conversion of
  1.    Mechanical to electrical energy
  2.    Electrical to mechanical energy
  3.    Current to voltage
  4.    Voltage to current
 Discuss Question
Answer: Option B. -> Electrical to mechanical energy
Question 28. A single-phase sinusoidal voltage of 120 V is connected to a 90 Ω load. Current in the circuit is
  1.    13.3 mA
  2.    133 mA
  3.    1.33 A
  4.    6.2 A
 Discuss Question
Answer: Option C. -> 1.33 A
Question 29. The term 'squirrel-cage' applies to a type of three-phase ac generator.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 30. A simple three-phase generator consists of three conductive loops separated by 120°.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True

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