A simple Zener voltage regulator is required to provide a steady regulated

output voltage of 10 V under a maximum load of 80 mA, while the input

voltage to the regulator varies between 12 V and 14 V.

17.1 Calculate the maximum rated current value of a Zener diode to be

used

17.2 Calculate the minimum power for the Zener that could be used

safely.

17.3 If a 5 W rated Zener were to be used in this circuit:

(i) Calculate the maximum rated current value of a Zener device

to be used

(ii) Calculate the range of possible RS. limiting resistor values.

(iii) Suggest a suitable standard E12 resistor value

Consider the full-wave rectifier circuit as shown below with C = 474 F and transformer winding ratio of 14:1. If the input voltage is 120 VAC (RMS) at 60 Hz, what is the load resistor value for a peak-to-peak ripple less than 0.5 V? What is the output DC voltage? Assume ideal diode.

1. 3.A 3-phase ,Y- connected synchronous motor operates at 480 volt,50 Hz,2-pole,0.8 pf leading.The armature winding resistance is j1.5 ohm.The efficiency of the motor is 95%.The output torque of the motor at rated conditions is 350 Nm .Calculate: (a)the output power (b)the input power and the input current (c)the internal generated voltage Ea (d)the converted power (e)power losses (20 points)

30. The open-circuit voltage at the terminal of load RL is 60V. Under the condition of maximum power transfer, the load voltage will be