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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