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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER 3(OLD) • EXAMINATION SUMMER 2018
Subject Code: 330902 Date: 30-Apr-2018
Subject Name: Basic Electronics
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Each question carry equal marks (14 marks)
Q.1

Explain the construction of cathode ray tube
07



07

Explain P-type and N-type Semiconductor with appropriate diagram.




Q.2

Write a Short note on VR tube photo tube.
07


VR
07

Explain Varactor diode in detail.




OR

Draw and explain V-I Characteristics of tunnel diode. List its applications.
07

V-I
Q.3

Explain H-parameters and state its advantages.
07



07

Explain working of NPN transistor.


NPN

OR
Q.3

Derive relationship between α and β.
07


α β
07

Draw and explain working, characteristics of NPN transistor in CB mode.


CB NPN

Q.4

Explain the construction, working and characteristics of N-channel FET.
07


FET
07

Draw and explain fan regulator circuit using DIAC and TRIAC.


DIAC TRIAC

OR
Q.4

Compare FET with BJT.
07


FET BJT
07
2/2

Write short note on MOSFET.


MOSFET

Q.5

Explain construction, working and characteristics of LED.
07


LED
07

Explain significance of color code.




OR
Q.5

Write a short note on photodiode and photo transistor.
07



07

Explain with neat sketch construction, working and applications of SCR.


SCR