Switchgear Protections Set 1

delayed ✘ instantaneous ✘ both of the above ✘ none of the above ✔

maintain the arc ✘ extinguish the arc ✘ transmit large power ✘ emit the ionizing electrons ✔

copper tungsten alloy ✘ porcelain ✘ electrolytic copper ✘ aluminium alloy ✔

over currents ✘ short duty ✘ intermittant duty ✘ repeated duty ✔

Connecting lines in parallel ✘ Connecting lines in series ✘ Using machines of high impedance ✘ Reducing the excitation of machines ✔

transposition of the power line ✘ transposition of the communication line ✘ both (A) and (B) ✘ increasing the distance between the conductors ✔

short-circuit ✘ temperature ✘ overload ✘ over voltage ✔

delayed trip action ✘ instantaneous trip action ✘ both of the above ✘ none of the above ✔

0.003 sec ✘ 0.01 sec ✘ 0.10 sec ✘ none of the above ✔

Open circuit ✘ Short-circuit ✘ Long ✘ None of the above ✔