SSC JE Electrical Engineering 2011
For the following questions answer them individually
In a 3-phase synchronous generator, the stator winding is connected in star, because a delta connection would
A 40 kVA transformer has a core loss of 400 W and full load copper loss of 800 W. The fraction of rated load at maximum efficiency is
A 220 V shunt motor develops a torque of 60 Nm at an armature current of 10 A. The torque developed when the armature current is 20 A, is
An alternator has rated field current of 3 A. It is developing 180 V at a field current of 1.5 A at rated speed. If its field current is made 3 A rated speed, then the generated voltage would be
In which of the following industries, are all the motors totally enclosed and moisture proof ?
100 kg of tin is to be smelt during an hour in a smelting furnace. If the smelting temperature of tin = $$235^\circ C$$ , specific heat = 0.054 , latent heat of liquidification = 13.3k cal/kg , initial temperature of tin = $$35^\circ C$$ , value of J = 4200J/k cal , then the capacity of the furnaces is
