ap genco papers

What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV? A. 4 kVA B. 0.25 kVA C. 16 kVA D. 8 kVA The turns ratio required to match an 80 source to a 320 load is A. 80 B. 20 C. 4 D. 2 When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is A. 12 V B. 120 V C. 240 V D. 2,400 V If a transformer has 50 turns in the primary winding and 10 turns in the secondary winding, what is the reflective resistance if the secondary load resistance is 250 ? A. 250 B. 25 C. 6,250 D. 62,500 A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is A. 0.2 B. 0.4 C. 5 D. 25 The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8? A. 8.8 V B. 88 V C. 880 V D. 8,800 V To step 110 V ac down to 20 V ac, the turns ratio must be A. 5.5 B. 18 C. 0.18 D. 0.018 The mutual inductance when k = 0.65, L1 = 2 H, and L2 = 5 H is A. 2 mH B. 2 H C. 4 H D. 8 H