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Electrical level 2 module 1 alternating current exam
Typology: Exams
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A 30-microfarad capacitor is in parallel with a 15-microfarad capacitor. The total capacitance is - answer ✅✅ 45 A circuit has a peak voltage of 275V. What is the average voltage value? - answer ✅✅175V A device that uses electromagnetic induction to transfer electrical energy from one circuit to another is a(n) - answer ✅✅transformer
According to the power triangle, the apparent power is - answer ✅✅greater than the true power Each of three equal capacitors in series has - answer ✅✅one-third the applied voltage If a transformer has 200 turns in the primary, 100 turns in the secondary, and 150VAC applied to the primary, the voltage across the secondary is - answer ✅✅75VAC If the area of the plates of a capacitor is increased, the amount of capacitance - answer ✅✅increases If the phase angles of two sine waves are both 0 degrees, then the waves - answer ✅✅are in phase
Reactive power is always - answer ✅✅ 90 ° out of phase with true power The formula for inductive reactance is - answer ✅✅XL = 2πfL The opposing force that an inductor presents to the flow of alternating current is called - answer ✅✅inductive reactance The power factor can be defined as the ratio of true power to - answer ✅✅apparent power The product of the source voltage and the total current is - answer ✅✅apparent power The self-induced voltage across an inductance is produced by a change in - answer ✅✅current with respect to time
Transformers in which the primary and secondary voltages are 180 degrees out of phase are known as - answer ✅✅unlike-wound transformers What is the current flow in a purely resistive AC circuit if the resistance is 15 ohms and the voltage is 150V? - answer ✅✅10A What is the frequency of an AC waveform that completes 20 cycles per half second? - answer ✅✅40Hz What is the step-down turns ratio of a transformer with 200 turns in the primary and 100 turns in the secondary? - answer ✅✅2: What is the true power in a 2A series RL circuit with a 100Ω resistor? - answer ✅✅400W
