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SINGLE PHASE AND THREE PHASE IN ELECTRICITY

Quiz by Reymark Aligarbes

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36 questions
Show answers
  • Q1
    What is a significant advantage of three-phase power systems over single-phase systems?
    Higher power efficiency and consistent delivery
    Lower installation cost
    Simpler wiring
    Less complex circuitry
    30s
  • Q2
    In a three-phase system, what is the angle difference between each phase?
    120 degrees
    60 degrees
    180 degrees
    90 degrees
    30s
  • Q3
    Which of the following devices typically uses a three-phase power supply?
    Battery chargers
    Industrial motors
    Household refrigerators
    Television sets
    30s
  • Q4
    What is the main disadvantage of single-phase power compared to three-phase power?
    Higher voltage requirements
    Limited power capacity
    More complex circuit design
    Increased installation time
    30s
  • Q5
    What is the primary reason for using a three-phase transformer instead of a single-phase transformer in industrial applications?
    To minimize heat generation
    To simplify the design
    To reduce the amount of copper required
    To increase voltage levels
    30s
  • Q6
    What is the phase sequence in a three-phase system?
    The frequency of the supply
    The resistance of the circuit
    The total length of the wires used
    The order in which the phases reach their peak voltage
    30s
  • Q7
    What is typically used to convert single-phase power to three-phase power?
    Phase converter
    Transformer
    Rectifier
    Inverter
    30s
  • Q8
    In terms of voltage, how do single-phase and three-phase systems typically differ?
    Both systems deliver the same voltage
    Single-phase systems can deliver more voltage
    Single-phase systems are safer voltage-wise
    Three-phase systems can deliver higher voltages efficiently
    30s
  • Q9
    What is the effect of adding more loads to a single-phase system compared to a three-phase system?
    Increased voltage drop and potential overload
    Improved power factor
    More efficient power distribution
    Reduced resistance
    30s
  • Q10
    What kind of load distribution is preferable in a three-phase system?
    Variable load distribution
    Unbalanced load distribution
    Balanced load distribution
    Constant load distribution
    30s
  • Q11
    What type of load is typically connected in a three-phase system for balanced operation?
    Delta-connected load
    Star-connected load
    Resistive load
    Single-phase load
    30s
  • Q12
    What is the main reason that three-phase systems are preferred for industrial applications?
    Easier maintenance
    Higher efficiency and power density
    Simpler circuitry
    Lower installation costs
    30s
  • Q13
    What is the formula for calculating the total power in a balanced three-phase system?
    P = √3 × V × I × cos(φ)
    P = V^2 / R
    P = V × I
    P = I^2 × R
    30s
  • Q14
    In a three-phase system, how is the line voltage related to the phase voltage in a star (Y) configuration?
    V_line = V_phase × 3
    V_line = V_phase
    V_line = V_phase / √3
    V_line = √3 × V_phase
    30s
  • Q15
    What is the primary purpose of a three-phase transformer?
    To provide surge protection
    To step up or step down voltage levels
    To convert AC to DC
    To filter electrical noise
    30s

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