Virtual Labs

A three phase full controlled converter is feeding the armature of a seperately excited DC motor. The motor has to also operate in quadrant - III. Which of the following method is suitable?

a: By connecting a free wheeling diode across the armature in addition to adjusting the triggering angle α b: By adjusting the triggering angle α only c: By adjusting the triggering angle α followed by armature connection reversal d: By operating the triggering angle α > π/2 rad

For what firing angle does a 3-Φ Full wave bridge rectifier act as a natural commutated inverter?

a: α>90° b: α<90° c: α>180° d: α<180°

Three phase full wave converter is supplying purely resistive load at 300 V d.c. for 0° firing angle. What would be the output voltage for 90° firing angle?

a: 0 V b: 40 V c: 50 V d: 100 V

What is the average output voltage of three phase full wave controlled rectifier with α<π/3?

a: 3√3/π Vmp cos⁡α b: √3/π Vmp cos⁡α c: 3√3/π Vmp cos2⁡α d: √3/π Vmp cos2⁡α

A three-phase controlled rectifier has an input voltage which is 480 V rms at 60 Hz. The load is modeled as a series resistance and inductance with R = 10 Ω and L = 50 mH. Determine the delay angle required to produce an average current of 50 A in the load?

a: 50° b: 39.5° c: 27.25° d: 20°

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