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# sheet 2 Qs - ME1331 Problem Sheet 2 Dr M K Darwish 1 A 106...

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ME1331 Problem Sheet 2 Dr. M. K. Darwish 1) A 106 µ F capacitor is connected in series with a 40 resistor across a 250 V, 50 Hz supply. Calculate: (a) the impedance, (b) the current, (c) the power factor (state whether lag or lead). 2) Calculate, for the circuit shown in the opposite figure, (a) the circuit current, (b) the voltage across the capacitor, (c) the supply voltage, and (d) the phase angle of the circuit. 3) A coil, of resistance 8 and inductance 0.0128 H, is connected to a 150 V, 50 Hz supply. Calculate: (a) the impedance of the coil, (b) the current which will flow, (c) the power factor, (d) the power absorbed by the coil. 4) When a d.c. supply at 240 V is applied to the ends of a certain choking coil, the current in the coil is 20 A. If an a.c. supply at 240 V, 50 Hz, is applied to the coil, the current in the coil is 12.15 A. Calculate the resistance, impedance, inductance, and reactance of the coil. 5) A circuit comprises a resistance of 6

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sheet 2 Qs - ME1331 Problem Sheet 2 Dr M K Darwish 1 A 106...

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