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Electric Circuits

Electric Circuits
In which of the circuits power factor can be zero?

 resistive.
 inductive.
 capacitive.
 both ‘a’ and ‘b’

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Electric Circuits
Which of the following can not be connected in series unless they are identical?

 Both of above.
 Resistance.
 Current source.
 Voltage source.

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Electric Circuits
Emf induced in a coil rotating in a uniform magnetic field will be maximum when the

 rate of change of flux linkage is minimum.
 rate of cutting flux by coil sides is minimum.
 flux linking with the coil is maximum.
 rate of change of flux linkage is maximum.

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Electric Circuits
If emf in a given circuit is given by e = 100 sinω0t, then maximum value of voltage and frequency will be

 100√2 V, 100 Hz.
 50√2 V, 100 Hz.
 100 V, 100 Hz.
 100 V, 50 Hz.

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Electric Circuits
Three element having conductance G1, G2 and G3 are connected in parallel. Their combined conductance will be

 (G1 + G2 + G3) - 1.
 G1 + G2 + G3.
 (1 / G1 + 1 / G2 + 1 / G3) - 1.
 1 / G1 + 1 / G2 + 1 / G3.

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Electric Circuits
A balanced delta connected load has an impedance of 9∠30o Ω per phase. What is the impedance per phase of its equivalent star?

 3∠30o Ω.
None of these
 27∠30o Ω
 30∠30o Ω.

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