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Electrical Engineering

Three Phase Systems In Power Applications MCQs

Practice Three Phase Systems In Power Applications MCQs for competitive exams.

Three Phase Systems In Power Applications MCQs

Practice questions from this topic.

In the transformer the function of a conservator is to

  1. A. Provide fresh air for cooling the transformer
  2. B. Supply cooling oil to transformer in time of need
  3. C. Protect the transformer from damage when oil expends due to heating
  4. D. None of the above
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A three-phase ∆-connected generator is driving a balanced load such that each phase current is 12 A in magnitude. When I θa = 12 ∠30° A, what are the polar expressions for the other phase currents?

  1. A. I θb = 12 ∠150° A, I θc = 12 ∠-90° A
  2. B. I θb = 12 ∠120° A, I θc = 12 ∠30° A
  3. C. I θb = 12 ∠30° A, I θc = 12 ∠120° A
  4. D. I θb = 12∠ 90° A, I θc = 12 ∠90° A
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A simple three-phase generator consists of three conductive loops separated by 120°.

  1. A. True
  2. B. False
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The term 'squirrel-cage' applies to a type of three-phase ac generator.

  1. A. True
  2. B. False
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A single-phase sinusoidal voltage of 120 V is connected to a 90 Ω load. Current in the circuit is

  1. A. 13.3 mA
  2. B. 133 mA
  3. C. 1.33 A
  4. D. 6.2 A
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A constant load power means a uniform conversion of

  1. A. Mechanical to electrical energy
  2. B. Electrical to mechanical energy
  3. C. Current to voltage
  4. D. Voltage to current
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A balanced load is one in which all the impedances are equal.

  1. A. True
  2. B. False
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In a balanced three-phase load, each phase has

  1. A. An equal amount of power
  2. B. One-third of total power
  3. C. Two-thirds of total power
  4. D. A power consumption equal to $$sqrt {3{{text{V}}_{text{L}}}} {I_{text{L}}}$$
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A simple two-phase generator consists of two conductive loops separated by 90°, rotating in a magnetic field.

  1. A. True
  2. B. False
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In a certain three-wire Y-connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages are

  1. A. 2,000 V
  2. B. 6,000 V
  3. C. 666 V
  4. D. 3,464 V
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Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by

  1. A. Certain constant phase angles
  2. B. Certain constant frequencies
  3. C. Certain constant voltages
  4. D. Certain constant currents
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In a three-phase system, the voltages are separated by

  1. A. 45°
  2. B. 90°
  3. C. 120°
  4. D. 180°
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