A capacitor of reactance 115 Ω is connected to a 230 V rms AC supply. What rms current flows?
Correct answer D. 2.0 A
Topic / 30 questions
Alternating Current MCQs
Page 2 of Alternating Current multiple-choice questions with answers. Tap an option to check yourself.
Page 2 of 2
- Electromagnetic Induction 30
- Fluid Dynamics 30
- Electrostatics 30
- Electronics 30
- Electromagnetism 30
- Current Electricity 30
- Work and Energy 30
- Waves 30
- Vectors and Equilibrium 30
- Nuclear Physics 30
- Dawn of Modern Physics 30
- Thermodynamics 30
- Rotational and Circular Motion 30
- Atomic Spectra 30
- Alternating Current 30
- Force and Motion 30
What is the phase relationship between the alternating current and the voltage across a pure resistor?
Correct answer B. They are in phase
An AC supply has a peak voltage of 325 V. What is its rms voltage?
Correct answer A. 230 V
Advertisement
What is the reactance of a 10 μF capacitor on a 50 Hz supply?
Correct answer A. 318 Ω
What is the reactance of a 0.20 H inductor on a 50 Hz supply?
Correct answer C. 62.8 Ω
What is the average power consumed by a pure inductor connected to an AC supply over a complete cycle?
Correct answer A. Zero
How does the reactance of an inductor depend on the frequency of the AC supply?
Correct answer A. It is directly proportional to frequency
How does the reactance of a capacitor change as the frequency of the AC supply increases?
Correct answer C. It decreases
In a purely capacitive AC circuit, how does the current compare in phase with the applied voltage?
Correct answer C. Current leads voltage by 90°
Advertisement
In a purely inductive AC circuit, how does the current compare in phase with the applied voltage?
Correct answer D. Current lags voltage by 90°