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Maximum efficiency of a transformer depe...

Maximum efficiency of a transformer depends on

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Assertion : A laminated core is used in transformers to increase eddy currents. Reason : The efficiency of a transformer increases with increase in eddy currents.

State the principle of working of a transformer. (b) Define efficiency of a transformer. (c ) State any two factors that reduce the efficiency of a transformer. (d) Calculate the current drawn by the primary of a 90% efficient transformer which steps down 220 V to 22 V , if the output resistance is 440 Omega .

NARAYNA-ALTERNATING CURRENT-C.U.Q
  1. Maximum efficiency of a transformer depends on

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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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