(Papers) CISCE : Download Class XII Exam Papers-2018 (ELECTRICITY AND ELECTRONICS)

ELECTRICITY AND ELECTRONICS :

• Subject : ELECTRICITY AND ELECTRONICS
• Year : 2018
• Class : 12
• Duration : 3 Hour

Instruction :

1. Answer all questions from Part I (Compulsory) and five questions from Part II.
2. All working, including rough work, should be done on the same sheet as,and adjacent to the rest of the answer.
3. Mathematical tables and squared paper are provided.
4. The intended marks for questions or parts of questions are given in brackets [ ]. 

Question 1
With the help of a neat circuit diagram, explain the working of a full wave rectifier. [4]
Question 2
(a) Name the component used for each of the following: [2]
(i) Filtration of electrical signal.
(ii) Amplification of electrical signal.
(b) Name an element for each of the following: [2]
(i) Pentavalent atom
(ii) Trivalent atom
Question 3
Explain briefly how a zener diode works where there is increase in: [4]
(a) Load
(b) I/P voltage 
Question 4
(a) Write any two properties of insulation used in a cable. [2]
(b) State any two reasons why conductors are usually made up of copper, aluminium,or galvanised steel.[2]
Question 5
Sketch a graph to show the plate characteristics of a triode. Also, state any two inferences drawn from the graph.[4]
Question 6
Fill in the blanks choosing the appropriate word from those given in brackets.
Write the correct answer in your answer booklet.[4]
(a) A metal plate buried deep inside earth in any electrical installation is called_____.
(earthing, doping)
(b) A safety device used for preventing an appliance from damage is called _______.
(fuse, inductor)
(c) If a pure semiconductor is heated, its resistance will go _______. (up, down)
(d) A device used in regulated power supply to change the voltage is called________.
(transformer, capacitor)

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