A 100-KVA, 60-Hz, 2200-V/220-V transformer is designed to operate at a maximum flux density of 1 T and an induced voltage of 12 volts per turn. Determine the number of turns of the primary & secondary winding.

A 3000/200-V, 50-Hz, 1-phase transformer is built on a core having an effective cross-sectional area of 150 cm2 and has 80 turns in the low-voltage winding. Calculate (a) the value of the maximum flux density in the core (b) the number of turns in the high-voltage winding.

2. A single-phase, 50-Hz, core-type transformer's no-load voltage ratio is 1,200/440. If the maximum flux is 0.075 Wb, determine the number of turns in each winding. 3. The low-voltage winding of a 3000/200-V, 50-Hz, a single-phase transformer has 80 turns and is installed on a core with an efficient cross-sectional area of 150 cm2. Make a calculation on: a. the high-voltage winding's number of turns b. the value of the maximum flux density in the core 4. When supplied at 230 V, 50 Hz, a transformer's no-load current is 5.0 A at 0.3 power factor. The primary winding has a total of 200 tums. Calculate the (i) maximum value of flux in the core, (ii) core loss, and (i) magnetizing current. 5. A 1-phase transformer has 500 primary and 1200 secondary turns. The net cross-sectional area of the core is 75 cm2. If the primary winding be connected to a 400-V, 50 Hz supply, calculate. (i) the peak value of flux density in the core and (i) voltage induced in the secondary winding.

When 2200 volts, 60 Hz is impressed on a certain transformer, the core loss is 240 Watts. When the frequency of the impressed voltage is changed to 25 Hz and the voltage is reduced to maintain the same flux density as before, the core loss falls to 75 Watts. Neglect impedance drop. What is the hysteresis loss at 60 Hz?