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Electric Circuits

Electric Circuits
The life of a lead acid battery is expected to be

 1 year.
 10 to 15 years.
 6 months.
 2 to 5 years.

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Electric Circuits
If c1 = 8 μF, c2 = 4 μF, c3 = 7 μF c1, c2 are in series with c3 in parallel; effective capacitance will be

 9.67 μF.
 2.21 μF.
 3 μF.
 6 μF.

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Electric Circuits
The synchronous speed for the seventh space harmonic mmf wave of 8 pole, 50 Hz induction machine will be

 107.14 rpm in reverse direction.
 5250 rpm in reverse direction.
 107.14 rpm in forward direction.
 5250 rpm in forward direction.

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Electric Circuits
What is called the frequency in AC operation?

 No. of (-) ve quadrature made per second.
 No. of wave made per second.
 No. of (+) ve quadrature made per second.
 No. of cycles made per second.

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Electric Circuits
A voltage source having an open circuit voltage of 100 V and internal resistance of 50 Ω is equivalent to a current source

 0.5 A in parallel with 50 Ω.
 2 A with 50 Ω in parallel.
 none of these.
 2 A with 50 Ω in series.

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Electric Circuits
In series RLC circuit to get Q>1, which of the following is required?

 XL = R
All of these
 XL < R
 XL > R

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