Download DBATU B-Tech 1st Year 2017 Dec Basic Electronics Engineering Question Paper

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DR. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY
LONERE — RAIGAD - 402 103

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End Semester Examination, December - 2017

Branch: B. Tech. Semester: I
Subject with Subject Code: Basic Electronics Engineering Marks: 60
(EXE105) Date: 20/12/2017 Time: 3 Hrs.

Instructions:

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1. Attempt any Five questions.
2. All questions carry equal marks.
3. Illustrate your answer with neat sketches, diagrams etc. wherever necessary.
4. Necessary data is given in the respective question. If such data is not given, it means that the knowledge of that component is a part of examination.
5. If some part or parameter is noticed to be missing, you may appropriately assume and state it clearly in the answer-book.

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Q.1.

A] Describe essential features of the following bonds: 06

1. Ionic bond
2. Covalent bond
3. Metallic bond

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B] Explain the classification of materials with electrical engineering point of view. 06

Q.2. Attempt any two of the followings:

A] How does the Fermi level changes with increasing temperature in the extrinsic semiconductors (n- type and p -type)? Sketch the energy level diagram. 06

B] What is Hall effect? Calculate Hall voltage, Hall coefficient and Hall angle. 06

C] Find the built-in voltage for a Si P-N junction with N_A=10¹⁶cm^-3 and N_D=10¹⁴cm^-3 at room temperature with n_i=10¹⁰cm^-3 06

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Q.3

A] Sketch V_o for the circuit and the input shown in Fig. I. D is a silicone diode with cutin voltage V_?=0.6V 06

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