102年 - 102 國立中山大學_碩士班招生考試_電機系(丁組)：電路學#110202

試卷資訊

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申論題 (13)

1.(10pt) A rechargcable battery is capable of delivering 100mA for 10 hours. How much charge can it release at that rate? If the terminal voltage is assumed as 3V, how much energy can the battery deliver?

2. (10pt) Find v₀ of the following circuit. Assume ideal OP amplifier.

3.(10pt) A balanced Y-connected load is connected to the generator by a balanced transmission line with impedance of 0.1+j0.2Ω per phase. The load is rated at 500kW, 0.866 power factor lagging, 254Vms phase voltage. Find line current and line voltage of the generator, respectively?

4.(10pt) Phase voltage and phase current of a load are given as v(t)=141cosotV, i()=14sin(ωt+30°) A. Find average power and reactive power of the load.

(a) RMS current. (5pt)

(b) Average power consumed by the resistor. (5pt)

(A)Calculate I. (5pt)

(B)Calculate I_L. (5pt)

(C)Calculate power factor. (5pt)

(D)How to improve the power factor to 0.95. (5pt)

1.Find minimum inductance L to keep the converter operated in continuous conduction mode.(10pt)

2.Ripple current on the inductor. (10pt)

3.Draw waveforms of both diode voltage and inductor current. (10pt)