Exercise 4.4 ▸ A 2.4 KVA, 2400/240 V 50 Hz step down transformer has the following parameters ▸ R₁ = 1.592, X₁= 2.502, R₂ 0.0202, X₂ = 0.039, Rc1 = 6ΚΩ, Xmı = 8ΚΩ = ▸ It is operating at 80% of its rated load at 0.8 power factor lagging. Using the approximate equivalent circuit of the transformer referred to the secondary side, determine its efficiency (61.4%), the voltage regulation (0.205%) and sketch its phasor diagram.

QUESTION 4 A real transformer has 1500 turns on the primary and 2000 turns on the secondary. Rp = 200, Rs = 220, Xp = 80, and Xs = 150. Calculate the equivalent reactance Xe. O 36.70 O 16.40 O 9.710 O 25.30

The table below shows some performance parameters of a certain power transformer. Full-load voltage regulation Full-load copper loss Load power factor 0.5 Lagging 5% The Maximum noccihle voltage regulation of the trane former is: 5.033 96 5.385 9 3 96 4.134 % 21 21

Which of the following statements is true about an ideal transformer? O It changes the magnitude of DC signals. O It converts DC signals into AC signals. O It converts AC signals into DC signals. O It changes the magnitude of AC signals. hp