Electrical Mach...

A 5kV/400V, 75 kVA single phase transformer has a series reactance of 0.12 pu. The reactance in ohms referred to LV and HV sides are to be

The % resistance and the % leakage reactance of a 5 kVA, 220 V/ 440 V, 50 Hz, single phase transformer are respectively 3 % and 4 %. The voltage to be applied to the HV side, to carry out SC test at rated current is _______ (in V)

For a single phase, 5 kVA, 200 V/ 400 V, 50 Hz transformer, the equivalent circuit parameters referred to HV side are given below.

R_m2 = 1066 Ω, X_m2 = 800 Ω, R_e2 = 1.12 Ω, X_2e = 1.14 Ω

What should be the applied voltage to the LV side when the transformer delivers rated current at 0.7 power factor lagging, at a terminal voltage of 400 V?

A voltage V = 400 sin 314t is applied to the transformer winding in a no load test. The resulting current is found to be i = 5 sin (314 t - 30°) find the core loss______watt

A single-phase transformer on open circuit condition gave the following test results:

Applied voltage	Frequency	Power drawn
192 V	40 Hz	39.2 W
288 V	60 Hz	73.2 W

 

The hysteresis and eddy current losses of the transformer respectively are, if the transformer is supplied with 240 V, 50 Hz.

The following data were obtained from testing a 48 kVA, 4800/240 V, 50 Hz transformer.

OC test from LV side	240 V	2 A	120 W
SC test from HV side	150 V	10 A	600 W

 

The maximum efficiency (in %) of the transformer for 0.8 lagging power factor load is ________ (up to two decimal places)

The maximum value of the flux in the core of a 5000/500 V, 50 Hz single phase transformer is 8.21 mWb. The number of turns in primary (N₁) and secondary winding (N₂) are

A 600 kVA transformer has an efficiency of 95% at full load and also at 60% of full load; both at U.P.F. Determine the efficiency (in %) of transformer at 3/4 th full load.