SSC JE Electrical Engineering 2012

Which of the following motors can work satisfactory on both AC and DC?

Two alternators rated 40 MVA and 60 MVA respectively are working in parallel and supplying a total load of 80 MW. Speed

Slip of a 3-phase induction motor may be expressed as

The emf induced per phase in a three phase star connected synchronous generator having the following data
Distribution factor = 0.955
Coil-span factor = 0.966
Frequency = 50 Hz
Flux per pole = 25 mwb
Turns per phase = 240
emf per phase is

In a 1-phase transformer, the copper loss at full load is 600 W. At half of the full load the copper loss will be

An auto-transformer used with a sodium vapour lamp should have high

In an auto-transformer, the number of turns in primary winding is 210 and in secondary winding is 140. If the input current is 60 A, the currents in output and in common winding are respectively

A 3-phase transformer has its primary connected in delta and secondary in star. Secondary to primary turns ratio per phase is 6. For a primary voltage of 200 V, the secondary voltage would be

A resistance and another circuit element are connected in series across a DC voltage V. The voltage across the second element is V initially and zero after time. The other element is pure

For RLC AC series circuit at resonance the current is