Switch Gear Overheating of relay contacts or contact born out is due to foreign matter on the contact surface too low contact pressure all of these slow making and breaking of load circuit contacts foreign matter on the contact surface too low contact pressure all of these slow making and breaking of load circuit contacts ANSWER DOWNLOAD EXAMIANS APP
Switch Gear The arc voltage produced in AC circuit breaker is always In phase with the arc current lagging the arc current by 90° None of these leading the arc current by 90° In phase with the arc current lagging the arc current by 90° None of these leading the arc current by 90° ANSWER DOWNLOAD EXAMIANS APP
Switch Gear The normal current in a power line is 100 A. If a short-circuit fault occurs on the line, then one can expect the short-circuit current to be 200 A 100 A more than 1000 A 300 A 200 A 100 A more than 1000 A 300 A ANSWER DOWNLOAD EXAMIANS APP
Switch Gear The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to insulate the contacts from switch body lubricate the contacts None of these All of these extinguish the arc insulate the contacts from switch body lubricate the contacts None of these All of these extinguish the arc ANSWER DOWNLOAD EXAMIANS APP
Switch Gear The operating time of a fuse is about 1 sec 0.8 sec 1.5 sec 0.002 sec 1 sec 0.8 sec 1.5 sec 0.002 sec ANSWER DOWNLOAD EXAMIANS APP
Switch Gear Air blast circuit breaker is used for short duty over currents repeated duty intermittent duty short duty over currents repeated duty intermittent duty ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS