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MCQs

Total Questions : 71 | Page 1 of 8 pages
Question 1. In a Y-connected source feeding a ∆-connected load,
  1.    Each phase of the load has one-third of the full line voltage across it
  2.    Each phase of the load has two-thirds of the full line voltage across it
  3.    Each phase of the load has the full line voltage across it
  4.    Each phase of the load has a voltage across it equal to √3
 Discuss Question
Answer: Option C. -> Each phase of the load has the full line voltage across it
Question 2. The stator is the rotating assembly in a generator or motor.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 3. In a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of
  1.    0°
  2.    30°
  3.    60°
  4.    120°
 Discuss Question
Answer: Option B. -> 30°
Question 4. Compare the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 Ω.
  1.    Single-phase 32 A; three-phase 16 A
  2.    Single-phase 16 A; three-phase 8 A
  3.    Single-phase 8 A; three-phase 4 A
  4.    Single-phase 16 A; three-phase 0 A
 Discuss Question
Answer: Option B. -> Single-phase 16 A; three-phase 8 A
Question 5. An alternator is an electromechanical ac generator.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 6. In a ∆-connected generator, there is a 120° difference between each line current and the nearest phase current.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 7. In a Y-connected generator, there is a 120° difference between each line voltage and the nearest phase voltage.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 8. Power is measured in a three-phase load by using an ammeter.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 9. A two-phase generator is connected to two 90 Ω load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?
  1.    1.33 A
  2.    1.88 A
  3.    2.66 A
  4.    1.77 A
 Discuss Question
Answer: Option D. -> 1.77 A
Question 10. 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?
  1.    0 A
  2.    1.33 A
  3.    3.99 A
  4.    2.66 A
 Discuss Question
Answer: Option A. -> 0 A

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