Complex AC MCQs

The impedance 3.2 - j12 in polar form is given as

A coil of 20 ohms resistance and 0.16 H inductance is connected in parallel with a 100 pF condenser to a constant voltage variable frequency supply. The frequency (neglecting the resistance) at which the current in the main is a minimum is given by

A balanced star connected load is supplied from a symmetrical three phase 440 V system. It draws current of 40 A at 0.866 power factor lagging. The total power take by the load will be

A 100 kW three phase delta connected motor works on a supply of three phase 3.3 kV. The motor efficiency is 92% and the power factor is 90%. The line current drawn by the motor will be

In A.C. circuit the power curve is a sine wave having

In a highly capacitive circuit

The resonant frequency for a parallel circuit is given by

In a series resonant circuit, the impedance of the circuit is

In a series resonant circuit the voltage acrossthe circuit is the same as the voltage across