CH-16 Alternating Current Leave a Comment / By abdulslambsn@gmail.com / October 6, 2025 Welcome To Your Quiz "CH-16 Alternating Current" Click on "Start Quiz" To Continue... 1. The value of capacitive reactance is given by: X𝒸 = VI X𝒸 = V/I X𝒸 = I/V All of above None 2. Alternating current or emf measuring instruments measures its: r.m.s value Peak value Average value None of the above None 3. One complete set of positive and negative value of alternating quantities is called: Frequency Time period Amplitude Cycle None 4. The waveform of alternating voltage is the graph between: Current and time Voltage and time Voltage and current Voltage along y- axis and time along x -axis None 5. The average value of alternating voltage over a complete cycle is: Zero 0.7 Vₘₐₓ 0.707 Vₘₐₓ None of these None 6. The basic circuit element in a D.C circuit is: An inductor A resistor A capacitor None of these None 7. The maximum current I₀ passing through a resistance R connected with an alternating voltage source V₀ is given by: I₀ = R x V₀ I₀ = V₀/R I₀ = R/V₀ I₀ = V₀ x R None 8. At what frequency 1 henry inductance offer same impendence as 1uF capacitor: 450 Hz 512 Hz 1 KHz 159 Hz None 9. The measure of the opposition offered by a capacitor to the flow of A.C is called: Reactance Resistance Impedance Capacitance None 10. The reactance of a coil depends upon: Inductance of the coil Capacitance of the coil Thickness of the coil None of these None 11. If frequency f is in Hz and inductance L is in milli henry, then Xₗ is in: milli ohm kilo ohm ohm None of these None 12. Which of the following statement is correct of for an A.C circuit: The current depends upon the components connected in circuit The current lags the voltage by a phase angle of 90⁰ The current leads the voltage by a phase angle of 90⁰ The current and voltage are in same phase None 13. The unit of impedance is: Farad Henry Tesla Ohm None 14. The highest value raised by the voltage or current in one cycle is known as: Peak value Minimum value Average value Zero value None 15. With increase of frequency of A.C supply, the inductive reactance is: Decreases Increases as square of frequency Remain unchanged Increases as directly to frequency None 16. In an R.L.C series circuit, the quantities which are directed opposite to each other are: X𝒸 and R X𝒸 and Xₗ X𝒸 and L Xₗ and C None 17. The positive value of current and voltage over a cycle is: Positive Zero Negative None of the above None 18. When resistance is increased in a series LCR circuit: Impedance decreases Reactance increases Phase angle increases Phase angle decreases None 19. A device that allows only the continuous flow of AC through a circuit is: Capacitor Inductor Dynamo D.C motor None 20. The impedance of a series circuit containing capacitance C, inductance L and resistance R is: R + L-1/C 1/R + L-C R + L +C None of the above None 21. If X be the reactance, Z be impedance then in a series L.C.R circuit: X² = [Z+R]² X² = [Z-R]² X² = Z² - R² X² = Z²+R² None 22. The process of combining low frequency signal with high frequency ratio waves is called: Resonance Fluctuation Modulation Amplitude None 23. The circuit in which current and voltage are in phase, the power factor is: Double Three times One Zero None 24. The peak value of alternating voltage is 423 volts, its rms value is: 300 volts 423 volts 150 volts 211.5 volts None 25. Modulation is the process of: Combining low frequency signal with carrier Separating the low frequency signal from higher frequency radio wave Combining low frequency signal with high frequency radio waves Both A and C None 26. A frequency of rotating coil of an A.C. generator is f Hz then frequency of e.m.f. produced is: 50 Hz 60 Hz f Hz None of these None 27. Slope of a horizontal line is: Zero Infinite Maximum None of these None 28. Since an inductor does not consume energy coil is used for controlling A.C. Such a coil is called: Resistor Choke Starter None of these None 29. If a glass plate is placed between plates of a capacitor, in series with a lightened bulb, the brightness of the bulb: Remains same Decreases Increases Bulb turns off None 30. Who proved that the light waves are electromagnetic? Faraday Einstein Maxwell Enderson None 31. A capacitor of a capacitance 30 uFis charged by a constant current of 10 mA. If initially capacitor is uncharged, what is time taken for potential difference across capacitor to reach 300 V? 0.9 sec. 15 sec. 1.5 x 10⁻⁵ s 0.9 x 10⁻³ s None 32. The electromagnetic spectrum contains: Radio waves X - rays Microwaves All of these None 33. Three phase supply also provides: 230 V 460 V 400 V None of these None 34. Parallel resonance circuit is also called: LC parallel Tank Rejector All of these None 35. When A.C. pass through an inductor, voltage leads the current by: Half cycle Quarter cycle Full cycle None of these None 36. For q-t graph, slope shows: Current Voltage e.m.f None of these None 37. The amplitude modulation AM transmission frequencies range from: 540 Hz to 1600 Hz 540 Hz to 1500 MHz 540 KHz to1600 KHz None of these None 38. In which of the following, the loss of energy is less: Alternating current Direct current Photoelectric current None of the above None 39. A.C varies as function of: Time Voltage Current Displacement None 40. Alternating current is one which changes in a: Magnitude Direction Magnitude as well as direction None of the above None 1 out of 8 Thanks For Taking This Quiz - Please See Your Answers/Results Below After Entering Your Name & Email... Name Email Time's up
