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CBSE UGC NET Previous Year 2012-2013 Solved Question Paper Electronic Science Paper-II

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Publisher Faculty Notes
Author: Panel of Experts
Number of Pages 31
Available in all digital devices
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ripple contents. Filters are used to reduce the ripple significantly. Various filters circuits and L, C, LC and CLC. The power supply with rectifier and filter is still unregulated.
The minimum supply voltage to operate IC 7815 is A 15 V B 17 V C 25 V D 40 V
Read the passage below and answer the questions 46 to 50, that follows based on your understanding of the passage
In series pass voltage regulator using zener diode, the function of zener diode is a A Voltage regulator B Voltage comparator C Breakdown diode D Temperature compensator
In order to maintain the output at constant level, voltage or current regulation is necessary. This is obtained by using series or shunt feedback. In addition to regulation, the power supply also requires protection e.g. overload, over current or short circuit protection. Pre- regulation is also carried out to improve the stability. Regulators can be designed by using discrete components. However, IC regulators are also available. These regulators have facilities like i voltage current boosting ii thermal shut-down iii floating point to facilitate higher output voltage. iv switching regulator to reduce the power dissipation. D-88-12