Power Quality And Management Set 3

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This set of Power Quality and Management Multiple Choice Questions & Answers (MCQs) focuses on Power Quality And Management Set 3

Q1 | The most common way to calculate voltage sag is from ______
  • Average Voltage
  • Peak Voltage
  • RMS Voltage
  • none of the above
Q2 | Effect of temperature rise in overhead lines is to
  • Increase Sag Decrease Tension
  • Decrease Sag Increase Tension
  • Increases both
  • Decreases Both
Q3 | What should be the value of sag for proper operation of overhead transmission line?
  • High
  • Low
  • Neither too low nor too high
  • Anything
Q4 | Voltage dips cannot be caused by which of the following:
  • Switching on of Large Loads
  • Local and Remote faults
  • Inductive Loading
  • Capacitive Switching
Q5 | Which one of the following cannot be possible with voltage surges:
  • Damaging to insulation
  • Tripping of Sensitive Equipment
  • Flicker in Incandescent Lamps
  • Damage to electronic components
Q6 | During sag, power electronic component will trip, this will decrease ______
  • Load Voltage
  • Supply Voltage
  • Load Current
  • none of the above
Q7 | The total power taken by the load remains constant so that _____ will be higher
  • Current
  • Voltage
  • Fluctuations
  • Harmonics
Q8 | The major cause of voltage sag is
  • Malfunction of primary component
  • Equipment Failure
  • Starting of large Induction Machine
  • All the above
Q9 | To obtain a constant current input, a inductor is placed in current source inductor(CSI) in:
  • Parallel
  • Series
  • Both Series and Parallel
  • Not placed at all
Q10 | The harmonic current distortion in adjustable speed drive is_____
  • Constant
  • Not Constant
  • High
  • low
Q11 | Reducing the number of short-circuit faults in a system, reduces ______
  • Sag
  • Interruptions
  • Sag & Interruptions
  • none of the above
Q12 | Current-limiting fuses are able to clear a fault within one _______.
  • Half cycle
  • full cycle
  • will not clear
  • none of the above
Q13 | By implementing changes in the supply system, the severity of the event will__.
  • Reduce
  • Increase
  • Remains the same
  • None of the above
Q14 | The main mitigation equipments is___
  • UPS
  • Storage device
  • voltage source converter
  • All the above
Q15 | During normal operation, the UPS takes its power from the supply, rectifies the acvoltage to dc and inverts it again to ac with the
  • same frequency and rms value
  • Different frequency and rms value
  • same frequency and different rms value
  • Different frequency and same rms value
Q16 | What is the value of transient stability limit?
  • Higher than steady state stability limit
  • Lower than steady state stability limit.
  • Depending upon the severity of load
  • All of these
Q17 | By using which component can the transient stability limit of a power system be improved?
  • Series resistance
  • Series capacitor
  • Series inductor
  • Shunt resistance
Q18 | What is transient stability limit?
  • The maximum flow of power through a particular point in the power system without loss of stability when small disturbances occur.
  • The maximum power flow possible through a particular component connected in the power system.
  • The maximum flow of power through a particular point in the power system without loss of stability when large and sudden disturbances occur
  • All of these
Q19 | Which among the following methods is used for improving the system stability?
  • Increasing the system voltage
  • Reducing the transfer reactance
  • Using high speed circuit breaker
  • All of these
Q20 | What is steady state stability limit?
  • The maximum flow of power through a particular point in the power system without loss of stability when small disturbances occur.
  • The maximum power flow possible through a particular component connected in the power system.
  • The maximum flow of power through a particular point in the power system without loss of stability when sudden disturbances occur
  • All of these
Q21 | Which among these is a classification of power system stability?
  • Frequency stability
  • Voltage stability
  • Rotor angle stability
  • All of these
Q22 | The stability of the power system is not affected by which among these?
  • Generator reactance
  • Line losses
  • Excitation of generators
  • All of these
Q23 | What is power system stability?
  • The maximum power flow possible through a particular component connected in the power system.
  • The ability of the power system to regain the state of operating equilibrium point when the system is subjected to any disturbances.
  • It is a phenomenon in which a power system losses its operating equilibrium when subjected to large disturbances.
  • All of these
Q24 | Power factor can be mathematically expressed as:
  • P/Q
  • Q/P
  • P/S
  • S/P
Q25 | The power factor angle of a purely inductive circuit is:
  • 45 degree
  • 60 degree
  • 75 degrees
  • 90 degree