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Electric Circuits

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

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

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Electric Circuits
Three resistances have the following ratings 150 Ω at 5 %, 100 Ω at 5 % and 200 Ω at 5 % respectively. The percentage error when all the three are connected in series will be

  + 5 %.
 + 8 %.
 + 7 %.
  + 6 %.

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Electric Circuits
Poorest conductor of electricity is

  Aluminium.
  Silver.
  Carbon.
  Steel.

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Electric Circuits
Active filter consists of

 op-amp.
 op-amp and capacitor.
 capacitor.
 inductor.

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Electric Circuits
Which resistor will be physically larger in size?

 100 Ω, 10 W.
 1 M Ω, 1/2 W.
 1 k Ω, 1 W.
 10 Ω, 50 W.

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Electric Circuits
If the three colour bands of a resistor are grey, violet and gold, what is the value of the resistor?

 8.7 ohms.
 9.7 ohms.
 7.7 ohms.
 6.7 ohms.

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