Switchgear Protections Set 4

to operate the relay of circuit breaker ✘ as a substitute for circuit breaker ✘ always independent of the position of circuit breaker ✘ generally on both sides of a circuit breaker ✔

transient state of short-circuit current ✘ sub-transient state of short-circuit current ✘ steady state of short-circuit current ✘ after D. C. component has ceased ✔

slow making and breaking of load circuit contacts ✘ foreign matter on the contact surface ✘ too low contact pressure ✘ all of the above ✔

reactors ✘ resistors ✘ capacitors ✘ none of the above ✔

overload ✘ reverse current ✘ open-circuits ✘ short-circuits ✔

few turns of thin wire ✘ few turns of thick wire ✘ many turns of thin wire ✘ many turns of thick wire ✔

Induction type ✘ Reactance ✘ Impedance ✘ None of the above ✔

interception and conduction ✘ interception ✘ interception, conduction and dissipation ✘ none of the above ✔

open the circuit ✘ protect the appliance ✘ protect the line ✘ prevent excessive currents ✔

relay ✘ rewirable fuse ✘ H.R.'only ✘ all of the above ✔