Basic Electrical Engineering BEE PSBTE Diploma Solved Paper May 2015

BASIC ELECTRONICS 2nd SEM EXAM/ECE/CSE/IT/EEE/0664/2661/May 2015

SECTION-A

Q1. Do as directed. 15×1=15

Resistivity of a semiconductors lies Between conductors and Insulators.
While forming PN junction, the diffusion is restricted by .
An ideal diode has Zero forward Resistance .
Under normal operating voltage, the reverse current in a silicon diode is about in 1 μA
A zener diode is always operated in the Zener Breakdown Region.
The three terminals of transistors are Emitter, base and Collector .
A transistor is usually applied for Base and Emitter Terminals.
The best biasing is achieved by adopting Voltage Divider biasing Circuit.
For a good voltage amplifier, its input impedance Equal to should be as compared to the source impedance.
A FET is also called as Uni polar Device.
The turn- on voltage for Silicon diode is 0.7 volt .
Filter circuits are used to reduce AC Components.
PIV stands for Peak Inverse Volatge .

SECTION-B

Q2. Attempt any five questions. 5×6=30

Explain Reverse Biasing of PN Junction ?
Write a note on Varactor diode. Give its Applications ?
Compare the forward volt-ampere characteristics of a Germanium and a silicon Diode with help of diagram ?
How transistor is used as an amplifier?
Explain why transistor should be Biased ?
A bypass capacitor is connected C_E is connected across the emitter resistor R_E, why?
Explain the working principle of a FET ?
Explain working of Capacitor- Input π Filter ?

SECTION-C

Q3. Attempt any three questions. 3×10=30

With the help of circuit diagram explain the working Of Full Wave Bridge Type Rectifier. Also Prove the efficiency is 81.2‰.
Explain the input and output characteristics of CE Configuration? Also derive the Relation between α and β.
Write a note on

N-type Semiconductor
Voltage Divider Biasing Circuit
Drift and Diffusion Current

Explain Conductors, Insulators and Semiconductors on the basis their energy band diagrams.

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Section a FILL IN THE BLANKS be paper

Resistivity of a semiconductors lies _____ conductors and Insulators.

Between

While forming PN junction, the diffusion is restricted by
An ideal diode has _____ forward Resistance .

Zero

Under normal operating voltage, the reverse current in a silicon diode is about in ____.

1 μA

A zener diode is always operated in the ______

Zener Breakdown Region.

The three terminals of transistors are _____, base and ________.

Emitter and Collector

In BJT, leakage current mainly depends on ___________.

Temperature.

AC load line of a transistor is steeper than its D.C. load line. (T/F)

True

The Best Biasing Method is achieved by adopting _______________________.

Potential Divider or Voltage Divider Biasing.

JFET stands for ______________________________.

Junction Field Effect Transistor

MOSFET is a _____________________ Controlled device

Voltage Controlled device.

The emitter and collector regions of BJT is ___________ Doped and _____________ Doped

Emitter is Highly Doped and Collector is Moderate Doped.

Free Electrons Exists in _____________ Band.

Valence Band

When both the junctions of a transistor are forward biased, it is said to be in _______________ Region

Saturation Region

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Section B : BE PAPER MAY 2015 PAPER

Explain Intrinsic and Extrinsic Semiconductor with Suitable Diagram ?

Intrinsic and Extrinsic Semiconductor Click Here.

What is Zener diode? Draw its symbol and explain its characteristics.

What is Zener diode? Draw its symbol and characteristics

Explain the Working of Half Wave Rectifier

Working of Half wave Rectifier click here

Explain the working of NPN Transistor ?

Working of NPN Transistor Click Here

Difference Between FET and BJT ?
h-Parameters (hybrid Parameter) of transistors ?

hybrid Parameter) of transistor

In what way the temperature variations affect the operating point of a transistor?

Temperature variations affect the operating point of a transistor

Explain the Phase reversal of output voltage with respect to input voltage in an Amplifier ?

Phase reversal of output voltage with respect to input voltage in an Amplifier

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