Theory
In
this page, all the links of theories of electrical subjects is given, including
power electronics, basic electronics, transmission line, basic electrical, AC
& DC Machines and Special Electrical Machines are given.
Basic
Electrical
What do you mean
by hot armature resistance?
Compare : Ideal
voltage source and ideal current source
Compare : Linear
load and non – linear load
What is function
of capacitor?
Capacitors –
Series & Parallel
Define : Charge,
current , power, potential , potential difference
Energy stored in
the capacitor
Mutual Coupling
between two inductances
Classification
of electrical heating
Properties of
heating materials
What do you mean
by conduction, convection and radiation?
Law of
magnetizing force between two magnetic poles
Define : Glare, bright , Dim, Excitation
Relation between magnetic flux density and magnetic field intensity
Coulomb law between two charges
Basic
Electronics
Single Phase half wave
rectifier
Single Phase full wave
rectifier
Rectifier Efficiency and
Power Efficiency
Compare –
Silicon and Germanium
What do you mean
by hole current?
Compare – Intrinsic
semiconductor and Extrinsic semiconductor
Diode terminologies:
Forward bias, Ripple factor, PIV, Depletion
Transistor
Transistor –
Structure ( Emitter, base and collector )
Working of
Transistor As an amplifier
Why CE
transistor configuration is mostly used?
Common base
transistor configuration
Common emitter
transistor configuration
Common collector
transistor configuration
Relation between
current amplification factor α and β
Relation between
current amplification factor α and γ
Cut off, active
and saturation region of transistor
DC Load line and
operating point
Compare –
Transistor and MOSFET
Compare –
Transistor and Vacuum tubes
Compare –
Holding current and Latching current
Compare – SCR and
Asymmetrical SCR
Biasing of Transistor
What is biasing?
Essential condition for biasing
What do you mean
by faithful amplification?
Need of
stabilization and thermal runaway
What do you mean
by stability factor?
Biasing method:
Voltage divider method
Transistor Amplifier
Amplifier terminologies:
Voltage gain , current gain and power gain
Common emitter
transistor amplifier
Direct coupled
transistor amplifier
RC coupled
transistor amplifier
Compare –
Voltage amplifier and power amplifier
Compare – Audio amplifier
and tuned amplifier
Power
Electronics
Semiconductor Devices
Structure,
working and characteristics of Diac
Structure,
working and characteristics of Triac
Structure,
working and characteristics of UJT
Structure,
working and characteristics of IGBT
Structure,
working and characteristics of GTO
Structure,
working and characteristics of MCT
Structure,
working and characteristics of SCR
Three Phase Rectifier
Working of Three
Phase half wave uncontrolled rectifier
Working of Three
Phase full wave uncontrolled rectifier
Working of Six
Phase half wave uncontrolled rectifier
Effect of
transformer winding reactance on working of uncontrolled rectifier
Industrial Applications of Semiconductor Devices
Pulse
Transformer OR Isolation Transformer
Light dimmer (
Fan regulator circuit )
Firing of SCR by
UJT half wave circuit
Firing of SCR by
UJT full wave circuit
Resistance
welding using triac and diac
Speed control of
universal motor
Speed control of
Induction motor by solid state devices
Speed control of
DC motor by solid state devices
How to improve power factor of converter?
Protection of the semiconductor devices
Why Protection of
semiconductor devices is necessary?
Over voltage protection
of semiconductor devices
Over voltage protection
by Metal oxide varistor ( MOV )
Over voltage protection
by Selenium diode
Function of
freewheeling diode
Commutation Methods
Class A
Commutation ( Self or Current or Resonance Commutation )
Class C
Commutation ( Voltage or Complementary Commutation )
Class D
Commutation ( Auxiliary Commutation )
Class E
Commutation ( External Pulse Commutation )
Class F Commutation ( AC or Natural or Line or Phase Commutation )
DC Chopper
Working
Principle of DC Chopper
Methods of
Chopper output voltage control
Working of step
up / step down chopper
Speed control of
Slip ring Induction Motor by DC Chopper
Speed control of DC Series Motor by DC Chopper
Inverter
Which is the
switching semiconductor devices used for Inverter?
Working of
Current source Inverter ( CSI )
Working of
Voltage source Inverter ( VSI )
Working of single
phase half bridge inverter
Working of
single phase full bridge inverter
Series inverter ( Load commutated Inverter )
Pulse width
modulation of the Inverter
Compare Inverter AC and Non - Inverter AC
Cycloconverter
Function of
inter – group reactor
Advantages, Disadvantages and Applications of Cycloconverter
Electrical
Wiring
Building
substation for Multi – storied building
Control circuit
of Direct on line starter
Control circuit
of semi automatic star delta starter
Control circuit
of fully automatic star delta starter
Control circuit
of forward – reverse starter
Color code of
flexible as well as non – flexible cable
Define :
Maintenance factor, Utilization factor, Depreciation factor
Do you know – Current
operated ELCB and Voltage operated ELCB?
Features of Digital
OR Static energy meter
How the energy
meter is protected by tempering?
How to find out
number of sub – circuit in the Electrical Installations?
How to measure
earth resistance?
Important :
Indian Electricity Rule No. 50
Important earthing
rules at per IE rules 1956
Inspection
report for low voltage installations
Protection area
covered by Lightning Arrestor
Schematic and
Wiring diagram of Go down wiring
Schematic and
Wiring diagram of Corridor wiring
Schematic and
wiring diagram of three lamps controlled by six switches
Schematic and
wiring diagram of one lamp is controlled by three switches
Twin tube light
wiring diagram
Why crushed rock is used at earth surface in the substation?
Total installed
Power capacity in India
List of Power
distribution companies in India
Ultra mega power
plant ( UMPP ) in India
Transmission
Line Map of India
Daily Renewable
Energy Generation in India
National Power
Training Institute
Integrated Power
Development Scheme ( IDPS )
What do you mean
by harmonics? Sources of generation of harmonics
Compare –
Voltage harmonics and Current harmonics
How to reduce
mitigation of third harmonics?
Effect of
harmonics on Power factor
Compare
capacitor bank and Individual capacitor
Power Triangle –
Active power, Reactive power and Apparent power
Series
compensation by capacitor bank
Single Phase
thyristor controlled reactor ( TCR )
Electro - mechanical Energy Conversation
Different methods of study of electrical machines
Singly excited system & doubly excited system
DC Generator
Characteristics of DC Shunt, DC Series and DC Compound
Generator
Armature reaction in the DC Generator
What is reactance voltage in the DC Generator?
How to built up voltage in the DC Generator?
DC Generator : Conditions for maximum efficiency
Commutation in the DC Machines
DC Motor
Torque and output power equation in the DC Motor
Speed control of DC Series Motor
Speed control of DC Shunt Motor
Function of Starter in the DC Motor
Characteristics of DC shunt motor, DC series motor and
DC compound Motor
To perform Swinburne Test on DC Shunt motor
Transformer efficiency
and condition for maximum efficiency
Parallel operation
of transformer
Working of auto
transformer & saving of copper material
Voltage regulation
of transformer
Per unit
resistance & per unit reactance
Neutral shift in
the transformer
Compare –
Distribution transformer & Power transformer
Zig zag
transformer – construction and advantages
Classification of
Dry type transformer
Advantages of
stepped core over square core in the transformer
Transformer name
plate as per Indian Standard
Standard kVA
rating of three phase transformer
Transformer testing
: Type test & Routine Test
Technical specification
of three phase transformer
Compare – three phase
transformer and Induction motor
To perform open
circuit test on transformer
To perform short circuit test on transformer
Three Phase Induction Motor
Rotating
magnetic field produced by two phase winding
Define :
Synchronous speed, slip spped, speed , rotor speed
Starting torque
and condition for maximum starting torque
Full load torque
and condition for maximum full load torque
Compare :
Squirrel cage and Slip ring induction motor
Torque – Slip characteristic
of three phase induction motor
Control circuit
of Direct on Line starter
Control circuit of
automatic star delta starter
Control circuit
of semi automatic star delta starter
Control circuit
of forward reverse starter
Compare starting torque and full load torque in
the starter
Single phase
induction motor
Split phase
motor : construction and working
Construction of
capacitor start and induction run motor
Construction and
working of capacitor start and capacitor run motor
Compare : Split
phase induction motor and capacitor start induction run motor
Alternator
Compare :
Cylindrical rotor and Salient pole alternator
Special
Electrical Machines
Tertiary winding
: construction and working
Earthing
transformer : construction and working
Hysteresis motor
: construction and working
Reluctance motor
: construction and working
Constant voltage
transformer : construction and working
Constant current
transformer : construction and working
Linear Induction
Motor : construction and working
How to separate
eddy current loss and hysteresis loss in the DC Machines?
How to separate
eddy current loss and hysteresis loss in the Transformer?
To perform
Hopkinson test on DC Shunt Motor
To perform field
test on DC Series Motor
Design of DC
series motor starter
Design of DC
shunt motor starter
Compare : BLDC
Motor & Conventional DC Motor
Stepper Motor terminology : Holding torque, Step angle, resolution
Transmission
Line
Compare
: Aluminum and Copper conductor
Features
of All Aluminum Conductor ( AAC )
Function
of Earthing Conductor
Standard
alternating voltage in India
On
which parameters, the skin effect depends?
Disadvantages
of low power factor
Power
triangle – Active power, Reactive power and Apparent power
Classifications
of transmission line
Compare
– Distributor, Feeder and Service Mains
What
do you mean by – low voltage, medium voltage and high voltage?
Sub -
station and transmission line in India
Minimum
Clearance between transmission line conductor and ground
Minimum
Clearance between transmission line When they cross each other
Working
of Induction Regulator
Right
of way ( ROW ) in the transmission line
String
Efficiency of Three Suspension Insulator
Methods
of Improving String Efficiency
Function
of series generator booster
Function
of booster transformer
Cables
Properties
of insulating material of cable
Construction
of Single Core LT Cable
Why
Belted Cable is not used above 22 kV?
Construction
of H type & SL type cable
Construction
of oil filled cable
Compare : Oil filled cable and Solid cable
Advantages
& Disadvantages of Gas ( Nitrogen ) filled cable
Insulation
resistance of single core cable
Formula
for most economical cable diameter
On
which factors, the dielectric loss on cable depends?
Low
Smoke Zero Halogen ( LSZH ) Cable
Advantages
and Disadvantages of underground cable over transmission line
Single
line diagram of AC supply system
Compare : Primary Distributor and Secondary Distributor
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