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A series of exercises and questions related to alternating currents (ac) for level 2 module 1. It covers key concepts such as transformers, inductive and capacitive reactance, phase relationships, and power calculations. The questions are designed to test understanding of fundamental ac principles and their applications.
Typology: Exams
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2:1What is the step-down turns ratio of a transformer with 200 turns in the primary and 100 turns in the secondary? induced high voltageOpening the secondary of a CT under load will cause a dangerous level of___. 40HzWhat is the hertz rating of an AC circuit if the frequency is 20 cycles per 1/2 second? Frequency increasesInductive reactance increases as the___.
Apparent power
The power factor can be defined as the ratio of true powerto___.
Increasing capacitanceFor a given frequency, the capacitive reactance decreases with___. By some angle between 0° and 90°In a circuit that has both capacitance and resistance, the current will lead the voltage___. Are 90° out of phaseIf the vector diagram of two AC waveforms is a right angle, then the waves___. ZeroIn an inductive AC circuit, when the applied voltage is at its maximum negative value, the current is___.
10AGiven: An AC circuit containing resistance only. What is the current flow if the resistance is 15 ohms and the voltage is150v?
Lags the voltageThe current in inductive circuit___.
Rms valuesUnless otherwise noted, the calculations in AC circuits use___. IncreasesWhen frequency decreases, capacitive reactance___.
It leads the voltage.Which of the following is true of the current in a capacitive circuit?
0.637 x peak valueIn sine wave terminology, the average value is___.
All DC rules and laws apply, including Ohm's lawIn AC circuits containing only resistance,___.
IncreasesIf the area of the plates of a capacitor is increased, the amount of capacitance___. Current with respect to timeThe self-induced voltage across in inductance is equal to the change in___. (^45) Given: A 30-microfarad capacitor in parallel with a 15- microfarad capacitor. The total capacitance is___.
Unlike-wound transformersTransformers in which the primary and secondary voltages are 180 out of phase are known as___. Across the field at 90°Maximum voltage is generated by rotating wire when the conductor is moving___. 10 HzIf the time for one cycle is 0.1 second, the frequency is___.
Are in phaseIf the phase angles of two sine waves are both 0 degrees then the waves___. 400WCalculate the true power in a 2A series RL circuit with a 100 ohms resistor.
