[فيونكة]

السلام عليكم ورحمة الله وبركاته
q1
The figure shows asimple ac circuit composed of a capacitor
connected across the terminals of an ac generator .if thefrequency of the generator doubled ,what happens to the capacitive reactanc of the capacitor ????

a) It decreases by a factor of 2 .
b)It increases by a factor of 2
c)It increases by afactor of 4
d)It decreases by a factor of 4



q2
what is the power factor of an RLC series circuit with an inductive reactance of 174 ohm , a capacitive reactance of 60 ohm and aresistance of 100 ohm ?

a)0.76
b)0.66
c)0.46
d)0.56

q3
A 120 –V rms voltage at 1000 Hz is applied to an inductor ,a 2.00-mF capacitor and a 100-W resistor ,if rms value of the current in this circuit is 0.680 A , what is the value of the inductor ??

a)11.4 mH
b)22.8 mH
c)35.8 mH
d)34.2 mH


q4

A series RLC circut has a 300-W resistor , a 12.0 -mH inductor and a 0.500-mF capacitor connected across a 120-V rms ac source at 30.0 kHz what is the phase angel of the circuit ?
a)0e

b)47.3e

c)90.0e
d)82.4e


q5

in a RLC circut the values of the inductance and capacitance are both doubled .In comparison with the resonance frequency of the original circuit the new resonant frequency will be ?????

a)reduce to one -quarter the boriginal value .

b)increased by a factor of two

c)reduced to one- half the original value

d)the same as befor
شكرااااااا

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