dc power supply

One component that does not need to be installed in the correct orientation is a: a. Resistorb. Diodec. Voltage regulatord.

A 3-phase full-wave bridge rectifier is built using six power diodes numbered 1 to 6. The phase sequence of the 3-phase source is ABC and the line to line voltage is 440 V. The line to neutral voltage of phase A has an angle of -30 degrees. The anodes of the diodes 1, 2, 3 are connected to phase A, B, and C, respectively, and the cathodes of diodes 1, 2, and 3 are connected to a common terminal that serves as the positive terminal of the rectifier's output. The cathodes of diodes 4, 5, and 6 are connected to phase A, B, and C, respectively, and the anodes of diodes 4, 5, and 6 are connected to a common terminal that serves as the negative terminal of the rectifier's output.  If diode 1 is damaged and acts as an open circuit, what would the RMS voltage be at the load?

In a three-phase induction motor the maximum torque occurs at 20% slip and the equivalent resistance of the secondary is 0.04Ω per phase. Find the equivalent load resistance and the load voltage and the load current. Output power is 20 kW.

Determine which diodes are forward-biased and which are reverse-biased in the configurations.. Assuming a 0.7-V drop across each forward-biased diode, determine the output voltage.

The four diodes used in a bridge rectifier circuit have forward resistances which may be considered constant at 1 ohm and infinite reverse resistance. The alternating supply voltage is 220 V r.m.s. and load resistance is 580 ohm. Calculate (i) mean load current and (ii) power dissipated in each diode.

Answer a,b,c,d

. A half-wave rectifier is needed to supply 15-V dc to a load that draws an average current of 300 mA. The peak-to-peak ripple is required to be 0.2 V or less. What is the minimum value allowed for the smoothing capacitance?

one SCR in anti parallel with firing angel of 90° for the 30. A single-phase voltage controller, using a diode, feeds a load R and Vs = 230 V. For a SCR, the PMMC voltage connected across R would read