12th Class Physics MCQS
Xc =
2?fc
fc/2?
1/2?fc
2?/fc
The circuit in which current and voltage are in phase, the power factor is:
Zero
-1
1
2
In AC system we generate sine wave form because:
It is nature standard
It produces least disturbance in electrical circuits
It san be easily draw
Other waves cannot be produced easily
The condition of resonance is:
XL = Xc
Xc = 4x2
None of above
XL = 1/2 Xc
In A.C circuit of inductor which one is true
Both remain in phase
Voltage lags current by ?/2
Current leads voltage by ?/2
Voltage leads current by phase angle ?/2
The peak value of alternating current is 5?2
2.5A
5?2A
5A
52
An alternating quantity (voltage or current) is completely known if we know its:
Frequency and phase
Effective value
Maximum
Both (a) & (b)
In Series resonance circuit the impedance of circuit art resonance frequency, is
Minimum
It is unequal to R
Maximum
None of above
The peak value of alternating current is 5?2
5?2A
2.5A
5A
52
For electromagnetic waves, Maxwell generalized
Gauses law for eletricity
Fradays law
Gauses law for magnetism
Amperes law
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