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ISC Class XII Board Specimen 2017 : Electricity And Electronics

6 pages, 57 questions, 11 questions with responses, 19 total responses,    0    0
ISC 12th
Indian School Certificate Examination (ISC), New Delhi
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ELECTRICITY AND ELECTRONICS (Three hours) Maximum Marks: 100 (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time.) ------------------------------------------------------------------------------------------------------------------------Answer all questions from Part I (Compulsory) and five questions from Part II. All working including rough work, should be done on the same sheet as, and adjacent to, the rest of the answer. Mathematical tables and squared paper are provided. The intended marks for questions or parts of questions are given in brackets [ ]. PART I Answer all questions. Question 1 (a) With reference to vacuum tubes define the following terms: (i) Grid cut off voltage; (ii) A.C plate resistance. (b) Calculate the mutual conductance (gm) of a triode if amplification factor ( )=20 and plate resistance (rp) =8000 . [2] [2] Question 2 (a) Draw a neat diagram to show that diode works as a half wave rectifier. [2] (b) State any two causes for failure of vaccum tube. [2] Question 3 (a) (b) What is the value of the ripple factor for the following: (i) Half wave rectifier; (ii) Full wave rectifier. State two main functions of bleeder resistor used in the regulated power supply. [2] [2] ----------------------------------------------------------------------------------------------------------------------- Copyright reserved. 1 ISC SPECIMEN QUESTION PAPER - 2017

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