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Electric Circuits

Electric Circuits
Three resistors each R Ohm is connected to form a triangle. The equivalent resistance across any terminals is

 R/2.
 3R/2.
 R.
 2R/3.

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Electric Circuits
If a resistor and an inductor are connected in series across a voltage source. Which two parameters in that circuit increase if frequency of voltage source increases?

 Z and I.
 VL and Z.
 VL and VR.
 VL and I.

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Electric Circuits
Three identical inductors are connected in delta with a 220 V, 50 Hz, 3 - φ, supply. If the phase current is 24 A, then what is the value of each of the inductance?

 0.029.
 None of these.
 0.049 H.
 0.058 H.

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Electric Circuits
Which of following is the unit of magnetic flux density?

 Tesla.
 Lumens.
 Daraf.
 Weber.

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Electric Circuits
When a lossy capacitor with a dielectric of permittivity ε and conductivity σ operates at a frequency ω the loss tangent for the capacitor is given by

  σ/ω ε.
 σ ω ε.
 ω σ/ε.
 ω ε/σ.

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Electric Circuits
In a capacitive circuit, the capacitive reactance is

 indirectly proportional to frequency
 indirectly proportional to the square of frequency
 directly proportional to the square of frequency
 directly proportional to frequency

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