A 500 kVA transformer has 95% efficiency at full load and also at 60% of full load both at upf. Wi= _________kW and Wcu= ____________kW

For supplying a balanced 3 − Φ load of 40-kVA, rating of each transformer in V − V bank should be nearly _______kVA.

The distribution transformer should be selected on the basis of 

A 100kVA, 230/115 V, 50Hz, single phase transformer is tested with OC and SC test. The Wattmeter reading during OC Test is found to be 1 kW and the Wattmeter reading during SC test is found to be 1.5kW. The percentage efficiency at half F.L. and 0.9 p.f lagging is 

When a 400-Hz transformer is operated at 50 Hz its kVA rating is

A voltage V = 400 sin314.16 t is applied to a 1-phase transformer on no-load. If the no load current of the transformer is 2 sin(314.16t ∠85⁰), then magnetization branch inductance will be approximately

A 500 kVA transformer at a certain loading condition gives iron loss : Pi=2500 Watt and the copper loss : PCu=7500 Watt. If the maximum efficiency occurs at the same loading condition, the load on the transformer in kVA would be approximately: 

The maximum flux density in the core of a 250/3000-volts, 50-Hz single-phase Transformer is 1.2 Wb/m². If the e.m.f. per turn is 8 volt, then area of the core is _______m²

A coil A of 1200 turns and another coil B of 800 turns lie near each other so that 60% of flux produced in one links with the other. It is found that a current of 5A in coil A produces a flux of 0.25 mWb, while the same current in coil B produces a flux of 0.15 mWb. The value of mutual inductance is______H

A 100 kVA, 11 kV/400 V distribution is connected delta-star. It is fully loaded. Assume the three transformers to be ideal. The phase-to-phase transformation ratio is ________