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Electric Circuits

Electric Circuits
Which of the following is the correct relation?

 all of these.
 AC-BD = 1.
 AB-CD = 1 .
 AD-BC = 1.

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Electric Circuits
The maximum power that can be transferred to the load resistor R from the voltage source in the figure is

 6/8W.
 1 W.
 7.5 W.
 9/8 W.

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Electric Circuits
Efficiency of electrical machines should be calculated by measuring

 losses and output.
 output and input.
 losses and input.
 losses.

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Electric Circuits
A capacitor is charged by a constant 10 mA current sources which is turned on for 1 second. Assuming the capacitor is initially charge free; determine the charge delivered to and the power supplied by the source if the capacitor has a value of 1 mF.

 0.1C, 100MW.
 0.01C and 5W.
 0.01C, 10MW.
 0.1C, 10MW.

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Electric Circuits
The unit of electric field intensity is

 F/ m2.
 F / m.
 N / C.
 N / Ampere.

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Electric Circuits
A balanced three Phase Y-connected load has one phase voltage VB = 277∠45o V. The phase sequence is RYB. The line to line voltage VRY is

 339∠45o V.
 339∠- 45o V.
 480∠45o V.
 480∠ - 45o V.

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