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PUNJAB BOARD PREVIOUS YEAR PAPERS-ALTERNATING CURRENTS-EXERSICE
- What do you mean by power factor of an a.c. circuit ?
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- Define inductive reactance of an inductor.
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- What is Wattless current ?
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- Define capacitive reactance of a capacitor.
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- What is an idle current ?
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- Define impedance of an a.c. circuit.
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- What is the impedance of a circuit ?
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- What is impedance of circuit at resonance ?
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- For a circuit at resonance, voltage applied is E = E@ sin wt and curre...
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- For a circuit at resonance, voltage applied is E = E@ sin wt and curre...
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- Define resonant frequency of LCR series circuit.
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- Which is more dangerous in use :a.c or d.c. ? Explain, why
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- Define root mean square value of an alternating current.
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- The frequency of an ac supply is doubled, what happens to inductive re...
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- How does capacitive reactance Xc of a capacitor vary in an a.c. and d....
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- How does inductive reactance.XL of an inductor vary in d.c.and high fr...
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- Define root mean square value of an alternating current.
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- Derive an our expressionforthe Power of an L.C.R.alternating current c...
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- Derive the relation for mean or average value of alternating current.
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- An alternating e.m.f is supplied through apure inductance. Investigate...
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