A. A dc chopper with a free-wheeling diode feeds a dc motor with an armature inductance of 15 mH and resistance of 12. The dc source voltage is 200 V. The ON time and OFF time are 2 ms and 0.5 ms respectively. Determine the armature current when the back Emf of the motor is 155 V. Also draw the power circuitry.

The winding of a 4-pole alternator having 36 slots and a coil span of 1 to 8 is short-pitched by ........... degrees. 150 40. 90 20 Brushless excitation system consisting of: Stator field winding and power diodes stator and rotor field winding and capacitor stator and rotor field winding and power diodes Everything mentioned in the options Full Name : *

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In a centre-tapped full wave rectifier having a load resistance resistance equals 3 2. The turn's ratio of the centre tapped transformer is 20:1. The primary winding of transformer is fed from a supply voltage of 220 V (RMS ), 50 Hz. Determine a) Average and RMS value of load currents b) DC voltage and DC power output c) AC input power d) ripple factor and e) rectifier efficiency. 750 52 diode forward bias

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A three-phase bridge rectifier of Figure below has a purely resistive load of R 40 2 and is supplied from a 280-V, 60-Hz source. The b primary and secondary of the input transformer are a Primary + b Secondary ic Van in D₁D3 D5 D4D6D₂ 0₂ connected in Y. Determine the average output voltage of the rectifier if the source inductances are negligible.

A three phase full wave rectifier is shown below along with peak phase voltage Vm-169.7V. The load is purely resistive. The rectifier delivers Ipc = 100 A and the source frequency is 60 Hz. The DC output voltage is %3D VDc=280.7V and the output RMS voltage is equal to VRMS=280.93V. The efficiency, FF and RF are respectively equal to: Secondary D D D, R AD. Z D. D, Select one: O a. 99.83%, 100.08%, 4% O b. 99.83%, 55.08%, 4% O C. 99.83%, 100.08%, 16% O d. 87.83%, 100.08%, 4%

For the half-wave rectifier, the source is a sinusoid of 120 V rms at a frequency of 60 Hz. The load resistor is 5 ohm. Determine (a) the average load current, (b) the average power absorbed by the load.

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