The magnetic field energy in an inductor changes from maximum value to minimum value in 5m sec when connected to an a.c. source. The frequency of the source is:
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- A 15-F AC capacitor is connected in series with a 50 resistor. The capacitor has a voltage rating of 600 WVDC. The capacitor and resistor are connected to a 480-V, 60-Hz circuit. Is the voltage rating of the capacitor sufficient for this connection?You are an electrician working in an industrial plant. You discover that the problem with a certain machine is a defective capacitor. The capacitor is connected to a 240-volt AC circuit. The information on the capacitor reveals that it has a capacitance value of 10 mF and a voltage rating of 240 VAC. The only 10-mF AC capacitor in the storeroom is marked with a voltage rating of 350 WVDC. Can this capacitor be used to replace the defective capacitor? Explain your answer.What is the equivalent resistance ?? and what is the total inductance ??
- An inductance coil consumes 500W of power at 10A and 110V and 60HZ. Determine the resistance and the inductance of the coilThree capacitors 6, 10 and 15 uF are connected in series across a 100 volt supply. Find the voltageacross the 10uF capacitor.An inductor of 230 milli Henry, a capacitor of 15 micro farad and a 200 ohm resistor are in series across a 36 V and 60 Hz voltage source. Find the total current a. 150 mA b. 0.164 A c. 0.2 A d. 170 mA
- A 470- uF capacitor is connected in series with a 120-k2 resistor. How long will it take the capacitor to charge completely?At DC operating point, a capacitor behaves like an open a wire O a resistor1. A purely resistive circuit the current is leading by 90° with respect to voltage. 2. A purely inductive circuit the current is lag behind the voltage by 90°. 3. A purely capacitive circuit the current is lead by 90° with respect to the voltage. 4. A capacitor element stored magnetic energy. 5. An inductor element stored electrical energy. 6. Resistor elements consume power. 7. Angle between current and voltage is called power. 8. The power factor angle for a purely resistive is zero. 9. The power factor angle for a purely inductive load is -90°. 10. The power factor of a purely capacitive is leading.
- An inductor and a resistor are in series with a sinewave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then options: Voltage across the inductor= Source Voltage Voltage across the inductor> Voltage across the resistor Voltage across the inductor= Voltage across the resistor Voltage across the resistor > Voltage across the inductorThe capacitor dissipation factor is the ratio of inductive reactance to its resistance resistance to its inductive reactance resistance to its capacitive reactance capacitive reactance to its resistanceA capacitor C is connected in parallel with a resistor R across a 120 V, 200 Hz supply. The supply current is 2 A at a power factor of 0.6 leading. Determine the values of C and R.