Question

a) Three-phase bridge rectifier has a purely resistive load. The rectifier has 6 diodes and each diode can handle average current equals to 10A. The secondary source line-line voltage and frequency are 380V (rms) and 60Hz, respectively. Determine: 1. The load resistance R. 2. Draw the current in phase ab (demonstrate your work for the first half-cycle) b) A 220 V, 1500 rpm 20 A separately excited dc motor has armature resistance of 1? and negligible armature inductance. The motor is supplied from a three phase full wave uncontrolled rectifier connected to a 220 V, 3 phase, 50 Hz supply through a ?/Y transformer. 3. Find out the transformer turns ratio so that the converter applies rated voltage to the motor.

          a) Three-phase bridge rectifier has a purely resistive load. The rectifier has 6 diodes and each diode can handle average current equals to 10A. The secondary source line-line voltage and frequency are 380V (rms) and 60Hz, respectively. Determine:
1. The load resistance R.
2. Draw the current in phase ab (demonstrate your work for the first half-cycle)

b) A 220 V, 1500 rpm 20 A separately excited dc motor has armature resistance of 1? and negligible armature inductance. The motor is supplied from a three phase full wave uncontrolled rectifier connected to a 220 V, 3 phase, 50 Hz supply through a ?/Y transformer.
3. Find out the transformer turns ratio so that the converter applies rated voltage to the motor.

a) Three-phase bridge rectifier has a purely resistive load. The rectifier has 6 diodes and each diode can handle average current equals to 10A. The secondary source line-line voltage and frequency are 380V (rms) and 60Hz, respectively. Determine:
1. The load resistance R.
2. Draw the current in phase ab (demonstrate your work for the first half-cycle)

b) A 220 V, 1500 rpm 20 A separately excited dc motor has armature resistance of 1? and negligible armature inductance. The motor is supplied from a three phase full wave uncontrolled rectifier connected to a 220 V, 3 phase, 50 Hz supply through a ?/Y transformer.
3. Find out the transformer turns ratio so that the converter applies rated voltage to the motor.

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