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What is power factor ?...

What is power factor ?

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For one series A.C. circuit, its reactance is equal to its resistance. Then its power factor is ……….

In an AC circuit current is 3 A and voltage 210 V and power is 63 W. The power factor is …….

In a series LCR A.C. circuit, by keeping resistance constant, power factor can be increased by decreasing .......

Ratio of power factor in two A.C. circuits (i) containing only resistance and (ii) containing only inductor is …….

In an L-C-R A.C. series circuit L = 5H, omega = "100 rads"^(-1) , R= 100 Omega and power factor is 0.5. Calculate the value of capacitance of the capacitor.

What is Q factor ?

For circuits used for transporting electric power, a low power factor implies large power loss in transmission. Explain.

A circuit connected with a source of 230 V, draws a current of 2A and power consumed from it is 100 W, then power factor of the circuit is …….

KUMAR PRAKASHAN-ALTERNATING CURRENTS -SECTION-D MCQs (COMPETITIVE EXAMS)
  1. What is power factor ?

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  2. Power factor of AC series circuit having resistance R and inductor L h...

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  3. A transformer has 140 turns in the primary and 280 turns in the second...

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  4. In an oscillating L-C circuit the maximum charge on the capacitor is Q...

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  5. Alternating current can not be measured by D.C. ammeter because ………

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  6. In a L-C-R circuit capacitance is changed from C to 2C. For the resona...

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  7. In a L-C-R series A.C. circuit, the voltage across each of the compone...

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  8. The power factor of A.C. circuit of resistance 12Omega and impedance ...

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  9. The phase difference between the alternating current and emf is pi/2 r...

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  10. In L-C-R series circuit at resonance p.d. between two ends of resistor...

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  11. In an A.C. generator, a coil with N turns, all the same area A and tot...

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  12. In A.C. circuit, when E = E0 sin omegat supply applied, current is obt...

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  13. An inductor (L = 0.03 H) and a resistor (R = 0.15 kOmega) are connecte...

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  14. An LCR circuit is equivalent to a damped pendulum. In an LCR circuit t...

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  15. An arc lamp requires a direct current of 10 A at 80 V to function. If ...

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  16. For an RLC circuit driven with voltage of amplitude vm and frequency ...

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  17. An emf of 20 V is applied at time t = 0 to a circuit containing in ser...

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  18. An inductor of inductance L and resistance R is connected of A.C. circ...

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  19. In an A.C circuit the current...

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  20. A primary of transformer has 100 turns an secondary has 500 turns. If ...

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  21. If in an A.C. circuit voltage V and current is then the power dissipat...

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