A 15μF capacitor is connected to a 240V, 50Hz ac. source. Calculate the reactance of the capacitance [π=3.142]
A. 16Ω B. 68Ω C. 106Ω D. 212Ω Correct Answer: Option D D. 212Ω Explanation Xc=1/2πFc = 2 x 3.142 x 50 x 15 x 10-6 = 212.179ΩAn electric motor converts?
A. electrical energy to mechanical energy B. mechanical energy to electrical energy C. mechanical energy to chemical energy D. electrical energy to thermal energy Correct Answer: Option A A. electrical energy to mechanical energyWhich of the following conditions occur at resonance in a series RLC circuit?
i. Impedance equal resistance ii. Current is maximum iii. Reactance is maximum iv. Current and voltage are 90o out of phase A. i and ii only B. i and ii only C. i, ii and iii only D. i, ii, iii and iv Correct Answer: Option A A. i and ii...The energy stored in a simple cell is?
A. electrical B. nuclear C. thermal D. chemical Correct Answer: Option D D. chemicalProducts
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