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Statement (A) : Flux leakage in a transf...

Statement (A) : Flux leakage in a transformer can be minimized by winding the primary and secondary coils one over the other.
Statement (B) : Core of the transformer is made of soft iron

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Permanent magnets are made of steel while the core of transformers is made of soft iron. Why?

Statement (A) : In high current low voltage windings of a transformer thick wire is used to minimize energy loss due to heat produced Statement (B) : The core of any transformer is laminated so as to reduce the erergy loss due to eddy currents.

A transformer contains 100 and 150 turns in its primary and secondary coils, respectively. The transformer is a (A) Step up tranformer (B) Step down transformer

NARAYNA-ALTERNATING CURRENT-C.U.Q
  1. Statement (A) : Flux leakage in a transformer can be minimized by wind...

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  2. In an ac circuit the current

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  3. The average emf during the positive half cycle of an ac supply of peak...

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  4. Alternating current is transmitted to distant places at

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  5. In case of a.c circuit, Ohm's law holds good for {:a) Peak values of...

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  6. In case of AC circuits the relation V = iZ, where Z is impedance, can ...

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  7. Alternating current can not be measured by D.C. Ammeter because

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  8. The r.m.s value of Potential due to superposition of given two alterna...

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  9. If the instantaneous current in a circuit is given by i=2cos (omegat-p...

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  10. If a capacitor is connected to two different A.C generators, then the ...

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  11. In general in an alternating current circuit

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  12. The magnitude inducted e.m.f. in an LR circuit at brea of circuit as c...

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  13. The emf and current in a circuit are such that E = E(0) sin omega t an...

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  14. The correct variation of resistance R with frequency f is given by

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  15. Same current is flowing in two alternating circuits. The first circuit...

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  16. When an a.c source is connected across a resistor

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  17. The phase angle between current and voltage in a purely inductive circ...

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  18. Ratio of impedence to capactive reactance has

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  19. An inductor-coil having some resistance is connected to an AC source. ...

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  20. Why the current does not rise immediately in a circuit containing indu...

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  21. In an AC circuit containing only capacitance the current

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