Electrical Machines-I 4th Sem EE/EEE/2520/May2019 PSBTE Paper

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BASIC ELECTRONICS 2nd SEM
EXAM/ECE/CSE/IT/EEE/0664/May 2018

SECTION-A

Q1. Do as directed. 15×1=15

Transformer core is made of silicon steel to reduce
Laminations are used in armature of DC machines to reduce losses.
In DC machines, maximum efficiency occurs when variable losses are to constant
The generator operates on the principle of induced
DC series motor is used for .
The DC motors are best suited where almost constant speed is
Very small transformers are generally
Transformer steps up or steps down the Input Voltage.
Transformer has no Losses.
Transformers are always rated in KVA

SECTION-B

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

Why starter is necessary for a DC motor?
What are the conditions for parallel operation of single phase transformer?

Why the efficiency of the transformer is higher than other AC machines?

A 4 pole, 1200 rpm generator with a lap wound armature has 65 slots and 12 conductors per slot. The flux per pole is 0.01 weber. Find the EMF induced in the
Why DC series motors cannot be started without load?
The no load ratio of a 50 Hz, single phase transformer is 3000/250 V. Determine the number of turns in each winding, if the maximum flux is 0.06 Wb in the

Explain the differences between Auto Transformer and single phase

SECTION-C

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

Explain the methods of speed control of DC shunt Motor
A 40 KVA transformer has iron losses of 450 W and full load copper losses 850 W. If P.F. of load is 0.9 lagging. Find full load efficiency, KVA load at which maximum efficiency occurs and the maximum
Explain the working of 3 point DC shunt motor starter with neat
Explain parallel operation of three phase Transformer.
A 25 KW, 250 V, DC shunt generator has armature and field resistance of 0.05 ohm and 100 ohm respectively. Find total armature power developed when working (i) as a generator delivering 25 KW output and ii) as a motor taking 25 KW

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Section a FILL IN THE BLANKS be paper

Which Impurity is added to Pure Semiconductor to Form N-type semiconductors

Pentavalent Impurity

What is The Efficiency of Half Wave Rectifier

40.6%

Which Transformer used in Full Wave Rectifier

Center-Tap transformer

Filter circuits are used to reduce

ac component

The value of knee voltage for silicon diode is

Knee Voltage of Silicon diode is 0.7V

Zener diode is made to operate in _______ Region

Zener Breakdown Region

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 2018 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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