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Alternating Cur...

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  • Question 1
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    A pair of slip rings is used in

  • Question 2
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    The core of a transformer is laminated to

  • Question 3
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    A generator produces a voltage that is given by V = 240 sin 120 t volt , where t is in second . The frequency and r.m.s voltage are

  • Question 4
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    Magnitude of e.m.f. produced in a coil , when a magnet is inserted into it dose not depend upon

  • Question 5
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    Lenzs law is a consequence of the law of conservation of

  • Question 6
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    Energy dissipates in LCR circuit in

  • Question 7
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    In general , in an alternating current circuit :

  • Question 8
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    A 20 volt a.c. is applied to a circuit consisting of a resistance & a coil with a negligible resistance . If the voltage across the resistance is 12 volts , the voltage across the coil is

  • Question 9
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    The back emf. In a DC motor is maximum when

  • Question 10
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    The current passing through a choke coil of 5 henry is decreasing at the rate of 2 amp./sec . The e.m.f.developed across the coil is .

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