Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 3rd Sem New 2131006 Electronic Devices And Circuits Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (New) EXAMINATION ? WINTER 2018
Subject Code: 2131006 Date: 01/12/2018
Subject Name: Electronic Devices and Circuits
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Define Semiconductor. Explain the Formation of P-type Semiconductor. 03
(b) Explain AC and DC Resistances for Diode.
04
(c) Draw and explain bridge rectifier circuit with capacitor filter. 07
Q.2 (a) Compare Zener Diode and PN junction Diode. 03
(b) With the help of neat figure, explain the operation of a N-P-N transistor. 04
(c) A full-wave rectifier circuit is fed from a transformer having a centre-tapped
secondary winding. The rms voltage from either end of secondary to center
tap is 30V. If the diode forward resistance is 2 ? and that of the half
secondary is 8 ?, for a load of 1 K?, calculate
(1) Power delivered to load
(2) % Regulation at full load
(3) Efficiency of rectification
(4) TUF of secondary.
07
OR
(c) Analyze the given circuit and sketch the nature of its output voltage. Assume
silicon diode with cut in voltage 0.6V.
07
Q.3 (a) Explain Transistor as a switch. 03
(b) Draw a fixed bias circuit, write the advantages and disadvantages of fixed
bias circuit.
04
(c) Draw the base biased amplifier circuit and explain its operation. 07
OR
Q.3 (a) Explain DC load line and Q-point for any transistor Configuration. 03
(b) Define following terms.
(1) Surge current (2) Drift Current (3) Pinch off voltage
(4) Ripple Factor
04
(c) For the Circuit given below, IC=2mA, ?=100, calculate RE, VCE and stability
factor S.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (New) EXAMINATION ? WINTER 2018
Subject Code: 2131006 Date: 01/12/2018
Subject Name: Electronic Devices and Circuits
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Define Semiconductor. Explain the Formation of P-type Semiconductor. 03
(b) Explain AC and DC Resistances for Diode.
04
(c) Draw and explain bridge rectifier circuit with capacitor filter. 07
Q.2 (a) Compare Zener Diode and PN junction Diode. 03
(b) With the help of neat figure, explain the operation of a N-P-N transistor. 04
(c) A full-wave rectifier circuit is fed from a transformer having a centre-tapped
secondary winding. The rms voltage from either end of secondary to center
tap is 30V. If the diode forward resistance is 2 ? and that of the half
secondary is 8 ?, for a load of 1 K?, calculate
(1) Power delivered to load
(2) % Regulation at full load
(3) Efficiency of rectification
(4) TUF of secondary.
07
OR
(c) Analyze the given circuit and sketch the nature of its output voltage. Assume
silicon diode with cut in voltage 0.6V.
07
Q.3 (a) Explain Transistor as a switch. 03
(b) Draw a fixed bias circuit, write the advantages and disadvantages of fixed
bias circuit.
04
(c) Draw the base biased amplifier circuit and explain its operation. 07
OR
Q.3 (a) Explain DC load line and Q-point for any transistor Configuration. 03
(b) Define following terms.
(1) Surge current (2) Drift Current (3) Pinch off voltage
(4) Ripple Factor
04
(c) For the Circuit given below, IC=2mA, ?=100, calculate RE, VCE and stability
factor S.
07
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2
Q.4 (a) State and Describe Miller?s Theorem 03
(b) Discuss the working of a series voltage Regulator. 04
(c) Explain the working of a transformer coupled class A power amplifier and
show the efficiency of class A transformer coupled amplifier is 50%.
07
OR
Q.4 (a) Explain the effect of coupling and bypass capacitors on the bandwidth. 03
(b) Compare different types of power amplifier based on conduction angle,
position of Q-point, efficiency and distortion.
04
(c) Define Voltage Regulation. Explain working of two transistor Regulator. 07
Q.5 (a) Explain Principal of operation of Photodiode. 03
(b) Write the advantages and disadvantages of negative feedback. 04
(c) Explain construction, operation and characteristic of P-channel
Enhancement type MOSFET in detail.
07
OR
Q.5 (a) If the base current in a transistor is 20?A when the emitter current is 6.4mA,
calculate the values of ? and ?. Also calculate the collector current.
03
(b) Differentiate Ohmic region and Saturation region of JFET 04
(c) Derive the expression of the input resistance with feedback for voltage shunt
feedback amplifier.
07
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This post was last modified on 20 February 2020