SSC JE Electrical Engineering 2015
For the following questions answer them individually
The per phase DC armature resistance of an alternator is 0.5Ω. The effective AC armature resistance would be about
A circuit breaker is rated as follows:1500 A, 33 KV, 3 sec, 3-phase oil circuit breaker. Determine the making current
.If span length is doubled witgh no change in other factors,the sag of the line will become
An alternator is supplying a load of 300 kW at a power factor of 0.6 lagging. If the power factor is raised to unity,how many more kW can alternator supply ?
What is the maximum number of point of light, fan and socket-outlets that can be connected in one sub-circuit ?
In dc operation of fluorescent tube, the life of the tube (a) increases by about 80$ as that with ac operation (b) decreases by about 80$ as that with ac operation
