ELECTRICITY AND ELECTRONICS Sample Paper
(Maximum Marks: 100)
(Time allowed: Three hours)
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PART I (40 Marks)
Answer all questions.
Explain the construction of a vacuum diode. 
Briefly explain what is the effect of temperature on semiconductors: 
(a) at absolute zero.
(b) above absolute zero.
With the help of a neat circuit diagram, explain the working of a semiconductor diode, as a full-wave rectifier (using two diodes). 
Draw the symbol used for each of the following &
label its part 
(b)Transistor (pnp or npn)
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