A 100/10V, 50VA double winding transformer is converted to 100/110V auto- transformer. What is the ratio of the auto-transformer? * 100VA 500VA 550VA 110VA The daily variation of load on a 100 kVA transformer is as follows: 8:00 am to 1:00 pm - 65 kW, 35 kVAr; 1:00 pm to 6:00 pm – 80 kW, 50 KVAR; 6:o0 pm to 1:00 am

A 100VA single-phase transformer inside a refrigerator has 100 turns in its primary coil and 20 turns in its secondary. A 120v ac source is connected to the primary. a. Is this an example of a step-up or a step-down transformer? b. What is the secondary voltage? c. Indicate why a transformer is needed in a fridge – why two different voltages are needed in a fridge, and indicate a part of the fridge that is powered by the secondary voltage of this transformer. d. Ifa 202 load is connected to the secondary, what percentage of its rated will the transformer supply? e. If the primary is reduced to 90 turns, what will the secondary voltage be with the same 120v primary source? power

How do i calculate secondary current in transformer analysis

c) A 100 kVA, 4500/250 V, 50 Hz single-phase transformer has 100 secondary turns.Determine: i.The primary current.ii.The secondary current.iii.The number of primary turns.