Physics Quiz 2
Chapter 7 Alternating Current
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In a pure capacitive circuit if the frequency of ac source is doubled, then its capacitive reactance will be *
1 point
Reciprocal of impedance is *
1 point
The peak value of ac voltage on a 220 V mains is *
1 point
In an a.c. generator, a coil with N turns, all of the same area A and total resistance R, rotates with frequency ω in a magnetic field B the maximum value of emf generated in the coil is *
1 point
A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A, the efficiency of the transformer is approximately *
1 point
What is the value of inductance L for which the current is maximum in a series LCR- circuit with C = 10 μF and ω = 1000 s-1? *
1 point
The reactance of a capacitor C is X. If both the frequency and capacitance be doubled, then new reactance will be *
1 point
A transformer works on the principle of *
1 point
Average power generated in an inductor connected to an a.c. source is *
1 point
At resonance frequency the impedance in series LCR circuit is *
1 point
If the rms current in a 50 Hz ac circuit is 5 A, the value of the current 1/300 seconds after its value becomes zero is *
1 point
An inductor of reactance 1 Ω and a resistor of 2 Ω are connected in series to the terminals of a 6 V (rms) a.c. source. The power dissipated in the circuit is *
1 point
Average value of ac over a complete cycle _________ . *
1 point
What effect on Inductive reactance with increases in frequency of ac? *
1 point
The value of alternating current at any given instant is *
1 point
The main reason for preferring usage of AC voltage over DC voltage is *
1 point
Alternating current is so called because *
1 point
The rms current Irms is related to the peak current Io *
1 point
Alternating current cannot be measured by D.C. ammeter because, *
1 point
If an LCR series circuit is connected to A.C. source then at resonance voltage across *
1 point
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