Questions
The power factor of a series RL circuit is . If the frequency of the applied ac is doubled, the power factor become.
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a
13
b
15
c
17
d
111
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Correct option is B
cosϕ=RZ=RR2+L2ω212=R2R2+Xc2 Xc=Rcosϕ1=RR2+(2Xc)2=R5R2Similar Questions
According to Bernoulli's theorem, The dimensional formula of the constant is :
(p-pressure, d-density, v-velocity, h-height, g- acceleration due to gravity)
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