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Q1. In an RLC circuit, what does the term 'resonance' refer to? (2019)
Solution:
Resonance in an RLC circuit occurs when the inductive reactance equals the capacitive reactance, resulting in maximum current at a specific frequency.
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Q2. In a transformer, if the primary coil has 100 turns and the secondary coil has 50 turns, what is the turns ratio? (2023)
Solution:
The turns ratio is 2:1, as the primary has twice the number of turns compared to the secondary.
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Q3. What is the role of a transformer in an AC circuit? (2023)
Solution:
A transformer is used to increase or decrease voltage in an AC circuit.
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Q4. What is the relationship between the frequency and the inductive reactance in an AC circuit? (2022)
Solution:
Inductive reactance is directly proportional to the frequency of the AC source.
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Q5. Which law states that the induced EMF in a closed loop is equal to the negative rate of change of magnetic flux through the loop? (2022)
Solution:
Faraday's Law states that the induced EMF in a closed loop is equal to the negative rate of change of magnetic flux through the loop.
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Q6. What is the effect of increasing the frequency of the AC supply on the inductive reactance? (2020)
Solution:
Inductive reactance increases with frequency, as X_L = 2πfL.
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Q7. In a transformer, if the primary coil has more turns than the secondary coil, what type of transformer is it? (2021)
Solution:
If the primary coil has more turns than the secondary coil, it is a step-down transformer.
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Q8. In an RLC circuit, what happens to the impedance at resonance? (2023)
Solution:
At resonance, the impedance in an RLC circuit is at a minimum.
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Q9. Which of the following devices uses electromagnetic induction? (2019)
Solution:
An electric motor uses electromagnetic induction to convert electrical energy into mechanical energy.
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Q10. What is the primary factor that determines the inductance of a coil? (2020)
Solution:
The inductance of a coil is determined by the length of the wire, the number of turns, and the material of the core.
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