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Electric Circuits

Electric Circuits
The rms value of the voltage U(t)= 3 + 4cos(3t)

  5 V.
 {3 + 2(1.141)} V.
  4.123 V.
 7 V.

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Electric Circuits
The coils having self inductor of 10 mH and 15 mH have an effective inductor of 40 mH, when connected in series aiding. What will be the equivalent inductor if we connect them in series opposing

 10 mH.
 5 mH.
 0 mH.
 20 mH.

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Electric Circuits
In RLC series circuit R = 2Ω, L = 2mH and C = 1μF and applied voltage is 10V DC. Then what is steady state current value?

 0A
 1A
 5A
 2A

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Electric Circuits
Common impurity in battery electrolyte is

 lead sulfate.
 iron.
 dust.
 sodium chloride.

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Electric Circuits
The electron is lighter than a proton by a factor of about

 184.
 18.4.
 18400.
 1840.

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Electric Circuits
Which of the following carbon coded resistor has value of 10k ohm with 20% tolerance?

 Orange, orange, black and gold stripes.
 Brown, black, orange and no tolerance band.
 Red, red, green and silver stripes.
 Yellow, violet, yellow and silver stripes.

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