November 25, 2011

ELECTRONIC DEVICES AND CIRCUITS JNTU previous years question papers


ELECTRONIC DEVICES AND CIRCUITS JNTU previous years question papers

Time: 3hours Max.Marks:75

Answer any FIVE questions

All questions carry equal marks

1.a) Define the following terms for a PN diode
i) Dynamic resistance ii) Load line
iii) Difference capacitance iv) Reverse saturation current
b) A reverse bias voltage of 90V is applied to a Germanium diode through a resistance R. The reverse saturation current of the diode is 50 μA at an operating temperature of 250C. Compute the diode current and voltage for
i) R = 10 MΩ ii) R = 100 KΩ [15]

2.a) List out the merits and demerits of Bridge type Full Wave rectifiers over centre tapped type Full Wave rectifiers.
b) The secondary voltages of a centre tapped transformer are given as 60V-0V-60V the total resistance of secondary coil and forward diode resistance of each section of transformer secondary is 62 Ω. Compute the following for a load resistance of 1 KΩ.
i) Average load current
ii) Percentage load regulation
iii) Rectification efficiency
iv) Ripple factor for 240 V/50Hz supply to primary of transformer.
c) What is bleeder resistance in L – section filters? [15]

3.a) Describe the functioning of a BJT in common base configuration.
b) Determine the collector current of a BJT with both of its junctions reverse biased. Assume ICO = 5μA, IEO = 3.58 μA, αN = 0.98 and any other parameter values as required.
c) How do you identify the region of operation of a BJT to be saturation region from the values of various circuit currents? [15]

4.a) Describe the significance of operating point, DC and AC load lines to ensure active region operation of a BJT in CE amplifier application.
b) Calculate the Q – point for the DC biased circuit shown below. [15]

5.a) With the help of a hybrid equivalent circuit of a BJT amplifier, derive expressions for voltage gain and current gain when the source and load resistances of finite values are connected.
b) List out the typical values of h – parameters in the three BJT configurations (CE, CB and CC).
c) Describe how hie and hfe can be determine from BJT characteristics. [15]

6.a) Differentiate between enhancement and depletion modes of a MOSFET with the help of its characteristics and construction.
b) Determine the pinch off voltage for an N – channel silicon. JFET if the thickness of its gate region is given as 3.2×10-4 cm and the donor density in n-type region is 1.2 ×105/cm3.
c) Establish a relation between the three JFET parameters, μ, rd and gm. [15]

7.a) Describe how a FET can be used as a voltage variable Resistance (VVR).
b) With the help of circuit diagram and its equivalent circuit of a source follower, derive an expression for the voltage gain possible. [15]

8. Describe the following briefly:
a) Principle of operation of a photodiode.
b) Energy band structure and V – I characteristics of a tunnel diode. [15]



FEEL USEFUL PLEASE GIVE +1

0 comments :

Post a Comment

Get Syllabus in your Mail

Labels

Accenture Admission Notice - 2010 Admission Notification Anna University Anna University Chennai Anna University Question Papers Anna University Trichy Apparel Technology and Management Aptitude Questions Arts and Science Colleges Biomedical Engineering C and CPP Ebooks Calicut University CBSE Question papers Civil Engineering Civil Service Exams Colleges in India Colleges Result Computer Science Engineering Core Jobs CS R2008 CSE CSIR NET EBooks Download ECE EEE EIE Electives Electrical and Electronics Engineering Electronics and communication Electronics and Instrumentation Engineering Engineering Engineering Colleges in Maharashtra Engineering Colleges in TamilNadu Engineering Admissions Engineering Colleges Engineering Colleges in Karnataka Engineering Jobs Engineering Syllabus Entrance Exam Dates Entrance Exam Results Entrance Examination Exam Time Table Experiencer First Year Syllabus Freshers Full Time Jobs Government jobs in india Hardware and Networking Jobs Hotel Management and Catering Technology IGNOU Information Technology INTEVIEW QUESTIONS IT Jobs JNTU Question Papers Jobs in Bangalore Jobs in Chennai Jobs in Coimbatore Jobs in Delhi Jobs in Hyderabad Jobs in India Jobs in Kerala Jobs in Noida Jobs in Tamilnadu Jobs in TATA Karnataka Educations Lab Manuals Mechanical Engineering Medical Colleges Placement Papers Plus 2 Preparation for exams Private Jobs in India Question Papers Question Papers Download Results Announcement Semester 1 Semester 2 Semester 3 Semester 4 Semester 5 Semester 6 Semester 7 Semester 8 Syllabus Syllabus Download Tamil Movie TCS Placement Papers Teaching Jobs TECH MAHINDRA Textile Technology Top colleges University Results UPSC VICEVESVARAYA TECHNOLOGICAL UNIVERSITY waec Walk-in Interview Web Designers

Followers

Archive

Anna university Engineering Syllabus

Earn Money From Online

Government jobs in india

Admission Notification

Total Pageviews

 

Privacy Policy
http://topengineeringcollegesintamilnadu.blogspot.com use third-party advertising companies to serve ads when you visit our website. These companies may use information (not including your name, address, email address, or telephone number) about your visits to this and other websites in order to provide advertisements about goods and services of interest to you. If you would like more information about this practice and to know your choices about not having this information used by these companies, click here.