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WorksheetsPower System Transients
Total questions: 15
Worksheet time: 8mins
How can we check upon the transient stability of a power system?
By checking variation in load angle
By checking variation of real power with load angle
Checking variation in load angle and real power
Checking variation in load angle or real power
How can we improve the steady state stability of the synchronous generator for a better performance?
Increasing the excitation
Increasing reactance
Decreasing moment of inertia
Increasing moment of inertia
The measure to improve the transient stability of the power system during the unbalanced or unsymmetrical fault can be taken as ________
Single pole switching of CB
Excitation control
Phase shifting transformer
Increasing turbine valve opening
Use of high speed circuit breaker will actually increase the system stability.
False
True
What does the steady state stability of a power system signify?
Maintaining the rated voltage
Maintaining rated frequency
Maintaining a synchronism between machines and tie-lines
All of the mentioned
Which one of the following device is used for improving the power factor of the system:
Synchronous Phase Modifier
Shunt Reactor
Series Reactor
Asynchronous Generator
Filters are used to reduce which of the following:
Voltage distortion
Voltage sag
Harmonics
All the options are correct
Which of the following contribute to the low voltage and poor power factor:
Reactive Power
Load imbalance
Harmonics
All the options are correct
Most of the power quality problems are related to grounding and neutral size issues
True
False
Total Harmonic Distortion (THD) is defined as the ratio of the Actual Fundamental to RMS harmonic content:
True
False
Which one of the following is waveform distortion:
DC offset
Notching
Electrical noise
All the options are correct
DC circuit has which of the following harmonic components:
Negative sequence harmonics
Positive sequence harmonics
DC Circuit will have no harmonic components
All the options are correct
Continuous and rapid variations in the load current magnitude which causes voltage variations:
Harmonics
Voltage distortion
Flicker
Voltage sag
Which one of the following cannot be possible with voltage surges:
Damage to electronic components
Flicker in Incandescent Lamps
Tripping of Sensitive Equipment
Damaging to insulation
The third harmonic currents are known as ______
Positive sequence harmonics
Negative sequence harmonics
Zero sequence harmonics
