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Analog Electronics - Engineering

Q1:

The zener diode in the rectangular circuit shown in the figure has a zener voltage of 5.8 volts and a zener knee current of 0.5 mA. The maximum load current drawn from this circuit ensuring proper functioning over the input voltage range between 20 and 30 volts, is

A 23.7 mA

B 14.2 mA

C 13.7 mA

D 24.2 mA

ANS:D - 24.2 mA

It is zener diode, hence 5.8 volt remain constant.  By applying KVL  30 = 1000 Imax + 5.8  Imax = 24.2 mA.