Problem 590: An 11,000 volts three-phase wye-connected turbo alternator has a synchronous reactance of 6 ohms and a negligible resistance per phase. When the field current is 8 A, the open circuit voltage is 12,000 volts. Determine the armature current when alternator developed maximum power.
A1456 A
B1712 A
C1643 A
D1566 A
#2📘 1001 RojasHard
Problem 593: A 3-phase 50 MVA, 13.8 kV, 3600 rpm, 60 Hz grid connected generator with a synchronous reactance of 3.8 ohms per phase operating with a lagging power factor of 0.88 at rated voltage and current. Determine new power factor if the rotor current is decreased by 5%.
A0.920
B0.935
C0.907
D0.977
#3📜 EE Pre-Board March 2013📘 PowerhouseHard
A three-phase, 60 Hz wye-connected wound rotor synchronous generator rated 10 kVA, 230 V has a synchronous reactance of 1.2 ohm per phase and an armature resistance of 0.5 ohm per phase. Calculate the percent regulation at full load with 0.8 lagging power factor.
A18.3%
B20.8%
C21.8%
D22.5%
#4📜 EE Pre-Board August 2017📘 PowerhouseHard
A two-pole, three-phase, 50 Hz star connected ac generator has 9 slots/pole and 6 conductors/slot. What is the flux per pole if the open circuit terminal voltage is 1,100 volts? Take the coil span as unity.
A0.166 Wb
B0.0956 Wb
C0.287 Wb
D0.331 Wb
#5📜 EE Pre-Board March 2018📘 PowerhouseHard
A three-phase 60 Hz wye-connected wound rotor synchronous generator rated at 10 kVA, 230V has a synchronous reactance of 1.2 ohm per phase and an armature resistance of 0.5 ohm per phase. Calculate the percent regulation at full-load with 0.8 lagging power factor.
