(a) Exciting admittance referred to the high voltage side.

Question

7. The primary and secondary induced e.m.fs. El and E2 in a two-winding transformer are always..... (a) equal in magnitude (b) antiphase with each other (c) in-phase with each other (d) determined by load on transformer secondary 8. A step-up transformer increases... (a) voltage (c) power (b) current (d) frequency. 9. The primary and secondary windings of an ordinary -winding transformer always have........... (a) different number of turns (b) same size of copper wire (c) a common magnetic circuit (d) separate magnetic circuits. 10. The ordinary efficiency of a given transformer is maximum when........... (a) it runs at half full-load (b) it runs at full-load (c) its Cu loss equals iron loss (d) it runs slightly overload. 11. The maximum efficiency of a 100-kVA transformer having iron loss of 900 kW and F.L. Cu loss of 1600 W occurs at ....... kVA. 70 12. The kVA rating of an ordinary 2-winding transformer is increased when connected as an autotransformer because..... (a) 56.3 (b)…

Answer 1

Question

Chapter 3, Problem 3.12P

To determine

(a)

Exciting admittance referred to the high voltage side.

To determine

(b)

Equivalent series impedance referred to the high voltage side.

To determine

(c)

Equivalent T circuit referred to the high voltage side.

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7. The primary and secondary induced e.m.fs. El and E2 in a two-winding transformer are always..... (a) equal in magnitude (b) antiphase with each other (c) in-phase with each other (d) determined by load on transformer secondary 8. A step-up transformer increases... (a) voltage (c) power (b) current (d) frequency. 9. The primary and secondary windings of an ordinary -winding transformer always have........... (a) different number of turns (b) same size of copper wire (c) a common magnetic circuit (d) separate magnetic circuits. 10. The ordinary efficiency of a given transformer is maximum when........... (a) it runs at half full-load (b) it runs at full-load (c) its Cu loss equals iron loss (d) it runs slightly overload. 11. The maximum efficiency of a 100-kVA transformer having iron loss of 900 kW and F.L. Cu loss of 1600 W occurs at ....... kVA. 70 12. The kVA rating of an ordinary 2-winding transformer is increased when connected as an autotransformer because..... (a) 56.3 (b)…

5. Write down the equations of a single phase transformer at no-load mode. Give the names of the resistances, reactance, e.m.f.'s, currents and voltages.

Find the elements of the equivalent circuit relative to the secondary of a single-phase transformer. The no-load voltages in the primary and secondary circuit are 200 and 400 volts, respectively, and at a frequency of 50 Hz. The primary no-load current at a voltage of 200 volts is 0.7 amps and the losses in the core are 70 watts. The resistance and reactance of the primary are 3.2 and 1.25 ohms, respectively. Secondary resistance and reactance 6.0, 0.07 ohms, respectively. Draw the equivalent circle, showing the values of its elements.