Alternating current was first created by French Inventor Hippolyte Pixii in 1832 to generate a truly alternating current, a Dynamo electric generator based on Faraday's principal. When electromagnetic induction rotates a loop or coil with angular velocity ω in a magnetic field, then an emf is produced due to the flux change, whose value is, V = V₀ Sine ωt. Let's know more about Alternating Current Quiz.
1. When was Alternating current invented?
A. In 1886
B. In 1887
C. In 1888
D. In 1889
2. Which type of AC quantity?
A. Vector
B. Scalar
C. Both of the above
D. None of the above
3. Why is A.C. voltage preferred over D.C?
A. It is easy to maintain the voltage for long transmission and distribution
B. The plant maintenance cost is cheaper
C. Transmission efficiency is higher
D. All of the above
4. What combination of circuit elements is most likely to comprise the circuit?
A. Inductor and capacitor
B. Resistor and capacitor
C. Both of the above
D. None of the above
5. The output of a step-down transformer is measured to be 24 Volt when connected to a Twelve watt light bulb. The value of the peak current is
A. 1/2 – √A
B. 2 – √A
C. Both of the above
D. None of the above
6. Which of the following elements are likely to constitute the circuit?
A. Resistor and a capacitor
B. Only a capacitor
C. Both of the above
D. None of the above
7. Electrical energy is transmitted over large distances at high AV. Which of the following statement is correct?
A. For a given power level, there is a lower current
B. Lower current implies less power loss
C. It is easy to reduce the voltage at the receiving end using step-down transformers
D. All of the above
8. For an LCR circuit, the power transferred from the driving source to the driven oscillator is P = I2Z cos φ. Which of the following statement is correct?
A. The driving force can give no energy to the oscillator (P = 0) in some cases
B. The driving force cannot siphon out (P <0) the energy out of the oscillator
C. Here, the power factor cos φ ≥0, P ≥0
D. All of the above
9. When an AC voltage of 220 V is applied to the capacitor C?
A. Current is in phase with the applied voltage and power delivered to the capacitor is zero
B. Maximum voltage between plates is 220 V
C. Maximum voltage between plates is 220 V
D. None of the above
10. Which energy of the LC circuit would be analogous to potential energy?
A. Electrostatic energy
B. Magnetic energy 12LI2
C. Magnetic energy LI
D. Electrostatic energy 12CV2
11. If the RMS current in a 50 Hz ac circuit is 5 A, the value of the current 1/300 seconds after its value becomes zero is…
A. 52 – √A
B. 532 −− √A
C. 5/6 A
D. 5/2 – √A
12. An inductor of reactance 1 Ω and a resistor of 2 Ω are connected in series to the terminals of a 6 V (RMS) A.C source. The power dissipated in the circuit is...
A. 8 W
B. 12 W
C. 14.4 W
D. 18 W
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