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Electric Circuits

Electric Circuits
Condition of symmetry in Z-parameter representation is

 Z11 = Z12.
 Z12 = Z22.
 Z11 = Z22.
 Z12 = Z21.

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Electric Circuits
Which of the following represents the resonance frequency (ω0) with respect to lower cutoff frequency (ω1) and higher cutoff frequency (ω2)

 ω1 - ω2
 √(ω1² + ω2²)
 ω1 + ω2
 ω1 / ω2

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Electric Circuits
Three parallel resistive branches are connected across a DC supply. The ratio of the branch resistances are given as R1:R2:R3 :: 2:4:6. The ratio of the branch currents is

 6:3:2.
 6:4:2.
 2:3:6.
 2:4:6.

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Electric Circuits
A capacitor having a capacitance of 40 μF is connected across 250 V DC source. The charging current will be least

 when capacitor is half charged.
 initially.
 when capacitor is almost 25% charged.
 when capacitor is fully charged.

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Electric Circuits
If a capacitors of capacitance 100 μF is connected across a voltage source of 10 V, then what will be the energy stored in that capacitor?

 10 × 10 - 3 Joule.
 5 × 10 - 2 Joule.
 5 × 10 - 3 Joule.
 10 × 10 6 Joule.

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Electric Circuits
What is the relation between line voltage and phase voltage in case of delta connection?

 VL = √3 VP.
 VL = 1/ √3 VP.
 None of these.
 VL = VP.

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