33 Power System Software questions from the Electrical Design bank, written for Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd.
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A.integrated power-system analysis suite widely used in India for load flow, short circuit, arc flash, relay coordination, motor starting and harmonic studies
B.IEEE 1584 calculation of incident energy in cal/cm² and arc-flash boundary from bolted fault current, clearing time and working distance
C.load flow re-run with each element out of service to confirm no overload or voltage violation, a planning requirement under the IEGC
D.log-log overlay of series protective devices in ETAP Star to verify grading margin, CT saturation and cable damage curves
Answer + AI explanation with Pro
2. Which term means: "integrated power-system analysis suite widely used in India for load flow, short circuit, arc flash, relay coordination, motor starting and harmonic studies"?
Junior
A.PSS/E
B.ETAP
C.Motor starting study
D.IEC 60909 method
Answer + AI explanation with Pro
3. Which statement is correct?
Junior
A.ETAP — simulation confirming bus voltage dip during direct-on-line start stays above about 80% so running motors and contactors do not drop out
B.ETAP — IEEE 1584 calculation of incident energy in cal/cm² and arc-flash boundary from bolted fault current, clearing time and working distance
C.ETAP — RMS uses phasor models with millisecond steps for electromechanical stability; EMT solves instantaneous waveforms with microsecond steps for converters
D.ETAP — integrated power-system analysis suite widely used in India for load flow, short circuit, arc flash, relay coordination, motor starting and harmonic studies
Answer + AI explanation with Pro
4. What is DIgSILENT PowerFactory?
Junior
A.MATLAB/Simulink block library for converters, machines and drives, used for control design and hardware-in-the-loop testing
B.utility-grade tool for load flow, RMS/EMT dynamic simulation, grid-code compliance and contingency analysis used for transmission-level studies
C.electromagnetic transient program that simulates switching, lightning, HVDC and FACTS behaviour with microsecond time steps
D.simulation confirming bus voltage dip during direct-on-line start stays above about 80% so running motors and contactors do not drop out
Answer + AI explanation with Pro
5. Which term means: "utility-grade tool for load flow, RMS/EMT dynamic simulation, grid-code compliance and contingency analysis used for transmission-level studies"?
Junior
A.IEC 60909 method
B.Simscape Electrical
C.Motor starting study
D.DIgSILENT PowerFactory
Answer + AI explanation with Pro
6. Which statement is correct?
Junior
A.DIgSILENT PowerFactory — short-circuit calculation using an equivalent voltage source at the fault with voltage factor c (1.1 for maximum) to give the initial symmetrical current Ik''
B.DIgSILENT PowerFactory — utility-grade tool for load flow, RMS/EMT dynamic simulation, grid-code compliance and contingency analysis used for transmission-level studies
C.DIgSILENT PowerFactory — RMS uses phasor models with millisecond steps for electromechanical stability; EMT solves instantaneous waveforms with microsecond steps for converters
D.DIgSILENT PowerFactory — MATLAB/Simulink block library for converters, machines and drives, used for control design and hardware-in-the-loop testing
Answer + AI explanation with Pro
7. What is PSCAD/EMTDC?
Junior
A.MATLAB/Simulink block library for converters, machines and drives, used for control design and hardware-in-the-loop testing
B.electromagnetic transient program that simulates switching, lightning, HVDC and FACTS behaviour with microsecond time steps
C.IEEE 1584 calculation of incident energy in cal/cm² and arc-flash boundary from bolted fault current, clearing time and working distance
D.Siemens planning tool for large-network load flow and dynamic stability whose model format is used for the Indian grid by CEA and NLDC
Answer + AI explanation with Pro
8. Which term means: "electromagnetic transient program that simulates switching, lightning, HVDC and FACTS behaviour with microsecond time steps"?
Junior
A.Arc flash study
B.Simscape Electrical
C.ETAP
D.PSCAD/EMTDC
Answer + AI explanation with Pro
9. Which statement is correct?
Junior
A.PSCAD/EMTDC — integrated power-system analysis suite widely used in India for load flow, short circuit, arc flash, relay coordination, motor starting and harmonic studies
B.PSCAD/EMTDC — utility-grade tool for load flow, RMS/EMT dynamic simulation, grid-code compliance and contingency analysis used for transmission-level studies
C.PSCAD/EMTDC — electromagnetic transient program that simulates switching, lightning, HVDC and FACTS behaviour with microsecond time steps
D.PSCAD/EMTDC — Siemens planning tool for large-network load flow and dynamic stability whose model format is used for the Indian grid by CEA and NLDC
Answer + AI explanation with Pro
10. What is PSS/E?
Junior
A.MATLAB/Simulink block library for converters, machines and drives, used for control design and hardware-in-the-loop testing
B.utility-grade tool for load flow, RMS/EMT dynamic simulation, grid-code compliance and contingency analysis used for transmission-level studies
C.simulation confirming bus voltage dip during direct-on-line start stays above about 80% so running motors and contactors do not drop out
D.Siemens planning tool for large-network load flow and dynamic stability whose model format is used for the Indian grid by CEA and NLDC
Answer + AI explanation with Pro
11. Which term means: "Siemens planning tool for large-network load flow and dynamic stability whose model format is used for the Indian grid by CEA and NLDC"?
Junior
A.Motor starting study
B.Time-current curve plot
C.Arc flash study
D.PSS/E
Answer + AI explanation with Pro
12. Which statement is correct?
Junior
A.PSS/E — simulation confirming bus voltage dip during direct-on-line start stays above about 80% so running motors and contactors do not drop out
B.PSS/E — MATLAB/Simulink block library for converters, machines and drives, used for control design and hardware-in-the-loop testing
C.PSS/E — Siemens planning tool for large-network load flow and dynamic stability whose model format is used for the Indian grid by CEA and NLDC
D.PSS/E — load flow re-run with each element out of service to confirm no overload or voltage violation, a planning requirement under the IEGC
Answer + AI explanation with Pro
13. What is IEC 60909 method?
Mid
A.utility-grade tool for load flow, RMS/EMT dynamic simulation, grid-code compliance and contingency analysis used for transmission-level studies
B.load flow re-run with each element out of service to confirm no overload or voltage violation, a planning requirement under the IEGC
C.electromagnetic transient program that simulates switching, lightning, HVDC and FACTS behaviour with microsecond time steps
D.short-circuit calculation using an equivalent voltage source at the fault with voltage factor c (1.1 for maximum) to give the initial symmetrical current Ik''
Answer + AI explanation with Pro
14. Which term means: "short-circuit calculation using an equivalent voltage source at the fault with voltage factor c (1.1 for maximum) to give the initial symmetrical current Ik''"?
Mid
A.Arc flash study
B.RMS vs EMT simulation
C.ETAP
D.IEC 60909 method
Answer + AI explanation with Pro
15. Which statement is correct?
Mid
A.IEC 60909 method — utility-grade tool for load flow, RMS/EMT dynamic simulation, grid-code compliance and contingency analysis used for transmission-level studies
B.IEC 60909 method — IEEE 1584 calculation of incident energy in cal/cm² and arc-flash boundary from bolted fault current, clearing time and working distance
C.IEC 60909 method — short-circuit calculation using an equivalent voltage source at the fault with voltage factor c (1.1 for maximum) to give the initial symmetrical current Ik''
D.IEC 60909 method — electromagnetic transient program that simulates switching, lightning, HVDC and FACTS behaviour with microsecond time steps
Answer + AI explanation with Pro
16. What is Arc flash study?
Mid
A.IEEE 1584 calculation of incident energy in cal/cm² and arc-flash boundary from bolted fault current, clearing time and working distance
B.simulation confirming bus voltage dip during direct-on-line start stays above about 80% so running motors and contactors do not drop out
C.MATLAB/Simulink block library for converters, machines and drives, used for control design and hardware-in-the-loop testing
D.load flow re-run with each element out of service to confirm no overload or voltage violation, a planning requirement under the IEGC
Answer + AI explanation with Pro
17. Which term means: "IEEE 1584 calculation of incident energy in cal/cm² and arc-flash boundary from bolted fault current, clearing time and working distance"?
Mid
A.Motor starting study
B.Time-current curve plot
C.RMS vs EMT simulation
D.Arc flash study
Answer + AI explanation with Pro
18. Which statement is correct?
Mid
A.Arc flash study — simulation confirming bus voltage dip during direct-on-line start stays above about 80% so running motors and contactors do not drop out
B.Arc flash study — IEEE 1584 calculation of incident energy in cal/cm² and arc-flash boundary from bolted fault current, clearing time and working distance
C.Arc flash study — RMS uses phasor models with millisecond steps for electromechanical stability; EMT solves instantaneous waveforms with microsecond steps for converters
D.Arc flash study — MATLAB/Simulink block library for converters, machines and drives, used for control design and hardware-in-the-loop testing
Answer + AI explanation with Pro
19. What is Time-current curve plot?
Mid
A.Siemens planning tool for large-network load flow and dynamic stability whose model format is used for the Indian grid by CEA and NLDC
B.log-log overlay of series protective devices in ETAP Star to verify grading margin, CT saturation and cable damage curves
C.integrated power-system analysis suite widely used in India for load flow, short circuit, arc flash, relay coordination, motor starting and harmonic studies
D.electromagnetic transient program that simulates switching, lightning, HVDC and FACTS behaviour with microsecond time steps
Answer + AI explanation with Pro
20. Which term means: "log-log overlay of series protective devices in ETAP Star to verify grading margin, CT saturation and cable damage curves"?
Mid
A.Time-current curve plot
B.Simscape Electrical
C.IEC 60909 method
D.Arc flash study
Answer + AI explanation with Pro
21. Which statement is correct?
Mid
A.Time-current curve plot — integrated power-system analysis suite widely used in India for load flow, short circuit, arc flash, relay coordination, motor starting and harmonic studies
B.Time-current curve plot — MATLAB/Simulink block library for converters, machines and drives, used for control design and hardware-in-the-loop testing
C.Time-current curve plot — load flow re-run with each element out of service to confirm no overload or voltage violation, a planning requirement under the IEGC
D.Time-current curve plot — log-log overlay of series protective devices in ETAP Star to verify grading margin, CT saturation and cable damage curves
Answer + AI explanation with Pro
22. What is Simscape Electrical?
Mid
A.utility-grade tool for load flow, RMS/EMT dynamic simulation, grid-code compliance and contingency analysis used for transmission-level studies
B.log-log overlay of series protective devices in ETAP Star to verify grading margin, CT saturation and cable damage curves
C.MATLAB/Simulink block library for converters, machines and drives, used for control design and hardware-in-the-loop testing
D.Siemens planning tool for large-network load flow and dynamic stability whose model format is used for the Indian grid by CEA and NLDC
Answer + AI explanation with Pro
23. Which term means: "MATLAB/Simulink block library for converters, machines and drives, used for control design and hardware-in-the-loop testing"?
Mid
A.IEC 60909 method
B.Simscape Electrical
C.PSS/E
D.Time-current curve plot
Answer + AI explanation with Pro
24. Which statement is correct?
Mid
A.Simscape Electrical — MATLAB/Simulink block library for converters, machines and drives, used for control design and hardware-in-the-loop testing
B.Simscape Electrical — simulation confirming bus voltage dip during direct-on-line start stays above about 80% so running motors and contactors do not drop out
C.Simscape Electrical — utility-grade tool for load flow, RMS/EMT dynamic simulation, grid-code compliance and contingency analysis used for transmission-level studies
D.Simscape Electrical — integrated power-system analysis suite widely used in India for load flow, short circuit, arc flash, relay coordination, motor starting and harmonic studies
Answer + AI explanation with Pro
25. What is Motor starting study?
Mid
A.simulation confirming bus voltage dip during direct-on-line start stays above about 80% so running motors and contactors do not drop out
B.log-log overlay of series protective devices in ETAP Star to verify grading margin, CT saturation and cable damage curves
C.load flow re-run with each element out of service to confirm no overload or voltage violation, a planning requirement under the IEGC
D.IEEE 1584 calculation of incident energy in cal/cm² and arc-flash boundary from bolted fault current, clearing time and working distance
Answer + AI explanation with Pro
26. Which term means: "simulation confirming bus voltage dip during direct-on-line start stays above about 80% so running motors and contactors do not drop out"?
Mid
A.N-1 contingency analysis
B.Arc flash study
C.Motor starting study
D.ETAP
Answer + AI explanation with Pro
27. Which statement is correct?
Mid
A.Motor starting study — RMS uses phasor models with millisecond steps for electromechanical stability; EMT solves instantaneous waveforms with microsecond steps for converters
B.Motor starting study — load flow re-run with each element out of service to confirm no overload or voltage violation, a planning requirement under the IEGC
C.Motor starting study — log-log overlay of series protective devices in ETAP Star to verify grading margin, CT saturation and cable damage curves
D.Motor starting study — simulation confirming bus voltage dip during direct-on-line start stays above about 80% so running motors and contactors do not drop out
Answer + AI explanation with Pro
28. What is RMS vs EMT simulation?
Senior
A.RMS uses phasor models with millisecond steps for electromechanical stability; EMT solves instantaneous waveforms with microsecond steps for converters
B.log-log overlay of series protective devices in ETAP Star to verify grading margin, CT saturation and cable damage curves
C.MATLAB/Simulink block library for converters, machines and drives, used for control design and hardware-in-the-loop testing
D.short-circuit calculation using an equivalent voltage source at the fault with voltage factor c (1.1 for maximum) to give the initial symmetrical current Ik''
Answer + AI explanation with Pro
29. Which term means: "RMS uses phasor models with millisecond steps for electromechanical stability; EMT solves instantaneous waveforms with microsecond steps for converters"?
Senior
A.Motor starting study
B.RMS vs EMT simulation
C.PSS/E
D.PSCAD/EMTDC
Answer + AI explanation with Pro
30. Which statement is correct?
Senior
A.RMS vs EMT simulation — electromagnetic transient program that simulates switching, lightning, HVDC and FACTS behaviour with microsecond time steps
B.RMS vs EMT simulation — IEEE 1584 calculation of incident energy in cal/cm² and arc-flash boundary from bolted fault current, clearing time and working distance
C.RMS vs EMT simulation — short-circuit calculation using an equivalent voltage source at the fault with voltage factor c (1.1 for maximum) to give the initial symmetrical current Ik''
D.RMS vs EMT simulation — RMS uses phasor models with millisecond steps for electromechanical stability; EMT solves instantaneous waveforms with microsecond steps for converters
Answer + AI explanation with Pro
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