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Electric Circuits

Electric Circuits
If one cycle of AC waveform occurs every millisecond, the frequency will be

 10 kHz.
 1000 Hz.
 50 Hz.
 100 Hz.

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Electric Circuits
An electrical motor has rating of 10 MVA at 0.8 lag, represented as series RL circuit at a 50 MVA base. Find the impedance value?

 (3 + j4) pu
 (4 + j2 ) pu
 (4 + j3) pu
 (2 + j4) pu

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Electric Circuits
A 3 – φ delta connected symmetrical load consumes P Watts of power from a balanced supply. If the same load is connected in star to the same supply then what is the power consumption?

 3P.
 √3P.
 P/3.
 P.

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Electric Circuits
Which of the following are the passive elements?

 Bulb
 None of these.
 Resistor
 Both

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

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Electric Circuits
Which of the following is not equivalent to watts?

 Amperes/volt.
 Ampere2 – Ohm.
 Ampere-volts.
 Joules per second.

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