A 400 V, 50 Hz, three-phase motor takes a line current of 15.0 A when operating at a lagging power factor of 0.65. When a capacitor bank is connected across the motor terminals, the line current is reduced to 11.5 A. Calculate the rating (in kVA) and the capa- citance per phase of the capacitor bank for: (a) star connection; (b) delta connection. Find also the new overall power factor

A 400-µF capacitor is connected to the terminal of a single-phase induction generator. The induction generator feeds a load through a single-phase transformer. The load voltage is 1,200 V (rms). Calculate the generator active power, if the power factor is 0.85 and the generator MVA rating is 3 times the capacitor's MVAR rating. Consider the system frequency is 60 Hz, and the load side winding turns is 2 times the generator side winding turns of the 1. transformer. 2. The field coil of one of 2 poles of a DC generator has 50 turns and an inductance of 0.2H. How much current will flow through the field coil in order to produce 2,000 V, while the generator has a shaft speed of 750 rpm, 80 conductors in the armature windings, and the number of the parallel paths is the same as the pole numbers? 3. The shaft of a single-phase 3 hp, 15 Nm, 60 Hz induction motor is coupled to a DC generator that requires an excitation current of 5 amp to produce 750 V. If the flux per pole is proportional to…

i need the answer quickly

A synchronous generator is rated 645 MVA, 24 kV, 0.9 pf lagging. It has a synchronous reactance 1.2 . The generator is feeding full load at 0.9 pf lagging at rated voltage. Calculate: (a) Excitation emf (E,) and power angle 8 (b) Reactive power drawn by the load Carry out calculations in pu form and convert the result to actual values.

A 500 kVA, 6.6 kV star connected alternator has a synchronous reactance of 1.0 per phase and negligible resistance. The differential relay operates if the out of balance current through it exceeds 30% of the normal full load current of the alternator. The star point of the alternator is earthed through a resistance of 5 2. What percent of the stator winding is left unprotected ? Show that the effect of the alternator reactance can be neglected.

Q A 50 Hz, 13.6kv, 3-phase arternator with grounded neutral hasinductance of 12 mH per phase and is connected to busbar 16]through a circuit breaker. The capacitance to earth between thealternator and the location of circuit breaker is o.03pF per phase.Neglect the resistance of the alternator. Determine the following:i) Maximum value of re-striking voltag. ."ro". the contactsof circuit breaker.i1) Frequency of transient oscillationsiii) Maximum value of RRRVir') Average RRRV upto the first peak of transientoscillations.

A SERIES CIRCUIT CONSISTING OF AN 80- OHM RESISTOR, A 0.30 HENRY INDUCTOR AND A 50-uf (MICROFARAD) CAPACITOR IS CONNECTED TO A 120-VOLT 60+ CYCLE SOURCE C ALCULATE THE FOLLOWINC : (A.) EQUIVALENT IMPEDANC E OF THE CKT, (B.) CURRENT (c.) VOLTAGE DROPACROSS THE SEVERAL UNITS (D.) POWER AND POWER FACTOR,

Two 100-kW, single-phase transformers are connected in parallel both on the primary and secondary. One transformer has an ohmic drop of 0.5% at full-load and an inductive drop of 8% at full-load current. The other has an ohmic drop of 0.75% and an inductive drop of 2%. Show how they will share a load of 180 kW at 0.9 p.f.

two generators supplying a load. Generator I has a no-load frequency of 62.5 Hz and a slope Sp1 of I MW/Hz. Generator 2 has a no-load frequency of 62.0 Hz and a slope sp2 of I MW/Hz. The two generators are supplying a real load totaling 2.5 MW at 0.8 PF lagging. (a) At what frequency is this system operating, and how much power is supplied by each of the two generators? (b) Suppose an additional I-MW load were attached to this power system. What would the new system frequency be, and how much power would Gl and G2 supply now? Generator 1 VT V2 Generator 2 VTí KVAR KVAR

2. When a large shunt capacitor is suddenly connected in parallel with the load bus in the distribution feeder, what would happen to this bus current? O A. Increase B. Decrease D. None of Above