For the transformer ratio arm bridges shown, C's=200 nF, Ra=300 M2, Rp= 20 G2, and Cp=20 nF. What of the following could be the ratio Na: Nb to balance the bridge.

The copper loss and iron loss of transformer at full load are 3600W and 500 W respectively. The copper loss and iron loss at 25% of full load will be respectively         1-(3600 W and 1000 W)       2-(1800 W and 500W)       3-(1800 W and 1000W)       4-(225W and 500 W)

A Buck Converter converts 24Vdc to 12Vdc with losses of 70W, and a load of 60Ohms. What is the current drawn from the power supply?

In transformer, the power will with decrease in voltage. increases decreases O remain same O be doubled

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For a H bridge converter with given spesifications find the following by hand Vin = 240V (DC) f = 5kHz C = 1uF Rload 100 ohm Duty cycle = 2*pi*50 The load consist of series connection of a resistor and an inductor and an ac voltage source. RI= 20 ohm LI = 20mH El = 20 * cos(2*pi*200) (AC) 1)The voltage across the load (rms and average) 2) The current flowing through the load (rms and average) 3)The voltage across one of the switching device (T1, mms and average) 4) The current flowing through the switching device (T1, mms and average)

4. 100 kVA, 6800-240 V, 50 Hz single phase step down transformer has the following parameters: RLs-0.008Ω RHs-2.6Ω Ri-HS-500 0Ω XLS-0.015Ω XHs=5.22 Xm,HS=88002 Transformer is delivering 80% of rated load at rated voltage and 0.95 lagging power factor. Determine the following: a) The equivalent impedance of the transformer referred to primary. b) Input impedance of the combined transformer and load. c) Actual input voltage at HV side. d) Input impedance if load is disconnected. e) Exciting current at no load.

You have a large single phase transformer with 7 tap settings (@ 0,+2,+4,+6% and -2,-4, and -6%) that lets you adjust the load voltage if necessary. The primary voltage is 4800V and the secondary voltage desired is 240V. Draw this arrangement with the 0% tap setting selected.

iers? Explain. REVIEW QUESTIONS 1. Show how you would parallel connect the transformers to the source and the load in Figure 6-2. Windings 1 to 2 and 3 to 4 are rated for 2.4 kV ac and windings 5 to 6 and 7 to 8 are rated for 400 V ac. C. SOURCE R 2400V Figure 6-2. 2. The efficiency of a transformer which supplies a pure capacitive load is

In transformer, the power will with increase in voltage. O increases decreases O be doubled O remain same