Determine the transformer efficiency a) at full load and 0.8 power factor b) at half full-load and 0.8 power factor.?

A single-phase transformer is rated at 30 kVA. The transformer has full-load copper losses of
700 W and iron losses of 400 W. Determine the transformer efficiency a) at full load and 0.8 power
factor b) at half full-load and 0.8 power factor.? 

 

 

 

 

 

A 410V, 3-phase star connected alternator supplies a delta-connected load, each phase of which has a
resistance of 20 Ω and inductive reactance 30 Ω. Calculate (a) the current supplied by the alternator
and (b) the output power and the kVA of the alternator, neglecting losses in the line between the
alternator and load. ?

 

 

Derive the E.M.F equation of the transformer? 

 

The input power to a 3-phase A.C. motor is measured as 4 kW. If the voltage and current to the motor
are 410V and 6A respectively, The power factor of the system is?

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