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Electric Circuits

Electric Circuits
Four capacitors each of 40 µF are connected in parallel, the equivalent capacitance of the system will be

 160 µF
 10 µF
 5 µF
 40 µF

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Electric Circuits
The time required for a pulse to change from 10 % to 90 % of its maximum value is known as

 rise time.
 run time.
 decay time.
 fall time.

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Electric Circuits
The rms value of the resultant current in a wire which carries a DC current of 10A and a sinusoidal current of peak value 20A is

 14.14A.
 17.3A .
 30A.
 22.4A.

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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

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

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Electric Circuits
In a 3 - φ delta connection, two-wattmeter method is used to measure the power; if the two watt meters read 28.13 kW and 13.31 kW, the power factor of connection will be

 0.85.
 0.9.
 0.6.
 0.4.

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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

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

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