33 real Power System Software questions from the Electrical Design bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.
1. What is ETAP?
Junior
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
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"?
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
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"?
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
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
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"?
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''
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''"?
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
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"?
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
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
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
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
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"?
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
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''
29. Which term means: "RMS uses phasor models with millisecond steps for electromechanical stability; EMT solves instantaneous waveforms with microsecond steps for converters"?
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
Showing 30 of 33 Power System Software questions — the full set, with answers, explanations and an AI tutor on every question, is inside.
Free to start
Answers, AI explanations, and a free readiness check
Sign up free to check your answers with explanations, ask the AI tutor anything on any question, and take the free 2-minute readiness check for a scored result. The full AI mock interview, scored like a real panel, unlocks with Pro.