Surge voltage originate in power systems due to A. lightning B. switching operations C. faults D. any of the above Ans d Impulse testing of transformers is done to determine the ability of A. bushings to withstand vibration B. insulation to withstand transient voltages C. windings to withstand voltage fluctuations D. all of the above Answer: Option B Insulators for high voltage applications are tested for A. power frequency tests B. impulse tests C. both (A) and (B) above D. none of the above Answer: Option C Switching surge is A. high voltage dc B. high voltage ac C. short duration transient voltage D. hyperbolically dying voltage Answer: Option C surge diverters are (A) non-linear resistors in series with spark gaps which act as fast switches (B) arc quenching devices (C) shunt reactors to limit the voltage rise due to Ferranti effect (D) over-voltages of power frequency harmonics. Answer: Option A Impulse testing of transformers is done to determine the ability of (A) bu...