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State the need for reduction of harmonics in inverters.
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asked
Mar 10, 2018
by
anonymous
State the need for reduction of harmonics in inverters. Enlist the various methods for reduction of harmonics in inverter output.
methods
reduction
harmonics
inverter
output
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asked
Mar 19, 2018
by
anonymous
The main reason for generation of harmonics in a transformer could be?
Last answer:
The main reason for generation of harmonics in a transformer could be saturation of core.
transformer
harmonics
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71
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1
answer
asked
Mar 22, 2018
by
anonymous
When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when?
Last answer:
When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when wheel base of axles is more, degree of curvature is more.
bogie
negotiates
curve
reduction
adhesion
resulting
sliding
acute
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1
answer
asked
Mar 19, 2018
by
anonymous
Reduction in core losses and increase in permeability are obtained with transformer employing?
Reduction in core losses and increase in permeability are obtained with transformer employing?
Last answer:
Reduction in core losses and increase in permeability are obtained with transformer employing core built-up of laminations of cold rolled grain oriented steel.
reduction
core
losses
increase
permeability
obtained
transformer
employing
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592
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1
answer
asked
Jan 2
by
anonymous
Purpose of Selective Catalytic Reduction (SCR)
Purpose of Selective Catalytic Reduction (SCR)
Last answer:
Purpose of Selective Catalytic Reduction (SCR) : 1. It reduces Nox 75% to 90% 2. Converts it in to molecular nitrogen and water vapor 3. It reduces HC emission up to 80% 4. It reduces PM emission 20 to 25%.
purpose
selective
catalytic
reduction
scr
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answer
asked
Apr 28, 2018
by
anonymous
Slot harmonics are reduced in induction motors by using
Slot harmonics are reduced in induction motors by using (A) fractional-pitch windings (B) fractional-slot windings (C) integral-slot windings (D) distributed windings
Last answer:
Slot harmonics are reduced in induction motors by using fractional-slot windings
slot
harmonics
induction
motors
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1
answer
asked
Mar 19, 2018
by
anonymous
Harmonics in transformer result in?
Last answer:
Harmonics in transformer result in increased core losses, increased I2R losses, and magnetic interference with communication circuits.
transformers
harmonics
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1
answer
asked
Mar 10, 2018
by
anonymous
Why harmonics are generated in electrical system?
Why harmonics are generated in electrical system?
harmonics
generated
electrical
system
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answers
asked
May 22, 2020
by
anonymous
Explain the effect of Harmonics on the Transformer.
Explain the effect of Harmonics on the Transformer.
Last answer:
Effect of Harmonics on the Transformer: 1. Core loss: Harmonic voltage increases the hysteresis and eddy current losses in the lamination. The amount of the core loss depends on ... small core vibrations. 5. Saturation problem: Sometimes additional harmonic voltage causes core saturation.
harmonics
transformer
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1
answer
asked
Mar 10, 2018
by
anonymous
What are the main causes of harmonics?
What are the main causes of harmonics?
Last answer:
Harmonic is a non linear load because linear load voltage deviated due to connection of some electrinie device such as converter,inverter
main
causes
harmonics
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1
answer
asked
Mar 10, 2018
by
anonymous
What is mitigation of harmonics?
What is mitigation of harmonics?
mitigation
harmonics
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43
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0
answers
asked
Mar 10, 2018
by
anonymous
What is current harmonics?
What is current harmonics?
current
harmonics
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0
answers
asked
Mar 10, 2018
by
anonymous
What are even and odd harmonics?
What are even and odd harmonics?
even
odd
harmonics
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52
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asked
Mar 10, 2018
by
anonymous
Why do non linear loads cause harmonics?
Why do non linear loads cause harmonics?
non
linear
loads
cause
harmonics
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0
answers
asked
Mar 10, 2018
by
anonymous
Explain the pulse width modulation technique for control of AC output voltage.
Explain the pulse width modulation technique for control of AC output voltage.
pulse
width
modulation
technique
control
ac
output
voltage
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83
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0
answers
asked
Mar 19, 2018
by
anonymous
Why thyristor are not preferred for inverter?
Why thyristor are not preferred for inverter?
thyristor
preferred
inverter
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432
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0
answers
asked
Feb 19, 2018
by
anonymous
Explain DC coupled drive circuit with unipolar output.
Explain DC coupled drive circuit with unipolar output.
Last answer:
DC coupled drive circuit with unipolar output: The figure shows the circuit and waveforms
dc
coupled
drive
circuit
unipolar
output
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1
answer
asked
Apr 29, 2018
by
anonymous
A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be
A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be
Last answer:
A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be triangular
single-phase
voltage
source
square-wave
inverter
feeds
pure
inductive
load
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502
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1
answer
asked
Feb 18, 2018
by
anonymous
Give the circuit analysis of current source inverter with resistive load.
Give the circuit analysis of current source inverter with resistive load. What are the main difference between voltage source inverter and current source inverter?
Last answer:
Current source inverter (CSI): In current source inverter, the output current is independent of load. The input current of current source inverter is constant. Current source converter converts DC input current to ... are connected in parallel. In CSI diodes are connected in series.
difference
between
vsi
csi
current
source
inverter
analysis
resistive
load
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1
answer
asked
Aug 2, 2019
by
anonymous
State the different methods of Power Generation adopted in India.
State the different methods of Power Generation adopted in India.
Last answer:
1. Hydro energy or hydro Electric power plant 2. Nuclear energy or nuclear Power Plant 3. Fossil fuels: i) Thermal energy (by combustion of coal) or Thermal Power Plant ii) Natural gas ... from any organic waste materials. It contains mixture of methane(50-65 % in volume) and carbon dioxide
different
methods
power
generation
india
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asked
Apr 30, 2018
by
anonymous
A voltage source inverter will have better performance if its
A voltage source inverter will have better performance if its (1) load inductance is small and source inductance is large. (2) both load and source inductance are small. (3) both load and source inductances are large. (4) load inductance is large and source inductance is small.
Last answer:
A voltage source inverter will have better performance if its load inductance is large and source inductance is small.
voltage
source
inverter
performance
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1
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asked
Apr 29, 2018
by
anonymous
A voltage source inverter is normally employed when
A voltage source inverter is normally employed when (1) source inductance is large and load inductance is small (2) source inductance is small and load inductance is large (3) both source and load inductance are small (4) both source and load inductance are large
Last answer:
3
voltage
source
inverter
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2
answers
asked
Feb 19, 2018
by
anonymous
Explain three phase bridge inverter.
Explain three phase bridge inverter.
Last answer:
Three phase bridge inverter: Three phase bridge inverter converts DC voltage input to three-phase variable frequency variable voltage output. DC voltage source can be a DC source or output of the rectifier. ... in proper sequence. The switch may be thyristor or IGBT etc.
three
phase
bridge
inverter
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350
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1
answer
asked
Aug 9, 2017
by
anonymous
What is Voltage Source Inverter (VSI) ?
What is Voltage Source Inverter (VSI) ?
Last answer:
Voltage Source Inverter (VSI) Inverter is device which converts Direct Current (DC) to Alternating Current (AC). There are two types of inverters one is Voltage source inverter ... VSI consist of two load terminals and three phase VSI consist of three load terminals.
voltage
source
inverter
vsi
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155
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1
answer
asked
May 3, 2020
by
anonymous
State the various lighting calculations methods and Describe any one of them.
State the various lighting calculations methods and Describe any one of them.
Last answer:
Lighting calculation methods: 1. Lumens or Light flux method 2. Point to point or Inverse Square law method 3. Watts per Square meter method i) Lumens or Light ... is taken according to the illumination desired on an average value considering overall efficiency of the lighting system.
state
the
various
lighting
calculations
methods
and
describe
any
one
of
them
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74
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1
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asked
Apr 29, 2018
by
anonymous
The largest change of input quantity for which there is no output of instrument is called ______
The largest change of input quantity for which there is no output of instrument is called ______ A) Dead time B) Dead input C) Dead output D) Dead zone
Last answer:
The largest change of input quantity for which there is no output of instrument is called Dead zone
input
quantity
output
instrument
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325
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1
answer
asked
Sep 6, 2018
by
anonymous
Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.
Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.
Last answer:
Methods for measurement of low resistance: 1. Ammeter voltmeter method 2. Kelvin's bridge method 3. Ohm meter method 4. Potentiometer method 5. Digital/analog multi-meter ... must be infinity for perfectly accurate measurement which is not possible. 2. Connection errors.
methods
measurement
low
medium
high
resistance
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2.5k
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1
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asked
Apr 29, 2018
by
anonymous
In a battery, the difference between the no-load voltage and the measured voltage output is called ________
In a battery, the difference between the no-load voltage and the measured voltage output is called ________ A) Internal voltage B) Internal resistance C) External resistance D) All the above
Last answer:
In a battery, the difference between the no-load voltage and the measured voltage output is called Internal resistance
battery
no-load
voltage
measured
output
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78
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1
answer
asked
Mar 25, 2018
by
anonymous
A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by...
A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will?
Last answer:
A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will increase.
series
bulb
heater
output
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107
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1
answer
asked
Sep 6, 2018
by
anonymous
List any two methods of reactive power measurement in 3 phase circuit.
List any two methods of reactive power measurement in 3 phase circuit.
Last answer:
Methods of reactive power measurement in 3 phase circuit: (i) Two single phase wattmeter method (ii) One single phase wattmeter method
methods
reactive
power
phase
circuit
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74
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1
answer
asked
Sep 8, 2018
by
anonymous
How are nuclear reactors controlled? Explain two different methods in brief.
How are nuclear reactors controlled? Explain two different methods in brief.
Last answer:
Nuclear reactor is controlled using control rods: Control rods are made up of very high neutron absorbing material like boron, cadmium. By adjusting height of control rods on reactor core ... of nuclear reaction will increase. Whereas by pushing control rod towards the core it will reduce.
nuclear
reactors
controlled
different
methods
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60
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2
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asked
May 3, 2020
by
anonymous
Analyze the effect of supply voltage on performance of LED as regards current, Lumen output, efficacy and life.
Analyze the effect of supply voltage on performance of LED as regards current, Lumen output, efficacy and life.
Last answer:
1) Effect on Current:- In LED current depends upon supply voltage, if voltage get changes then current also change but this change in current will be control by resistors which are connected in series. 2) ... 4) Effect on Life:- If supply voltage is not stable then life of LED get reduced.
analyze
the
effect
of
supply
voltage
on
performance
led
as
regards
current
lumen
output
efficacy
and
life
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59
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1
answer
asked
May 2, 2020
by
anonymous
With the help of N-channel JFET describe the effect of input voltage VGS on output current ID.
With the help of N-channel JFET describe the effect of input voltage VGS on output current ID.
Last answer:
Working of N channel FET: * When a voltage is applied between the drain and source with a DC supply (VDD), the electrons flows from source to drain through narrow channel ... where the channel gets completely blocked and the drain current becomes zero is called pinch- off voltage.
with
the
help
of
n-channel
jfet
describe
effect
input
voltage
vgs
on
output
current
id
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46
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1
answer
asked
Sep 5, 2018
by
anonymous
Explain full wave bridged rectifier with the help of circuit diagram and input output waveform.
Explain full wave bridged rectifier with the help of circuit diagram and input output waveform.
Last answer:
1. In positive half cycle (0 to Π): The end A of the secondary winding becomes positive and end B negative. This makes diode D1 and D4 forward biased while diode D2 and D3 are reverse biased. These two diodes will ... D2 and D3 when it is conducting is as follows. B - D2 - RL - D3 - A
full
wave
bridged
rectifier
input
output
waveform
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79
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1
answer
asked
Apr 1, 2020
by
anonymous
A linear network has a current input 4cos(ω t + 20º)A and a voltage output 10 cos(ωt +110º) V. Determine the associated impedance.
A linear network has a current input 4cos(ω t + 20º)A and a voltage output 10 cos(ωt +110º) V. Determine the associated impedance.
Last answer:
Solution
linear
network
current
input
voltage
output
impedance
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89
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1
answer
asked
Apr 30, 2018
by
anonymous
A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input
A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is :
Last answer:
A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is : 200 V
3-phase
voltage
source
inverter
operates
conduction
mode
star
resistive
load
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137
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1
answer
asked
Apr 29, 2018
by
anonymous
In a self-controlled synchronous motor fed from a variable frequency inverter
In a self-controlled synchronous motor fed from a variable frequency inverter (1) the rotor poles invariably have damper windings (2) there are stability problems (3) the speed of the rotor decides stator frequency (4) the frequency of the stator decides the rotor speed
Last answer:
In a self-controlled synchronous motor fed from a variable frequency inverter the frequency of the stator decides the rotor speed
self-controlled
synchronous
motor
variable
frequency
inverter
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383
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1
answer
asked
Feb 24, 2018
by
Amit Sharma
How IGBT convert DC into AC in solar inverter?
Last answer:
Igbt alone cant convert dc to ac. igbt half bridge or full bridge or three phase topology could be used to convert dc to ac. also igbt gates should be driven by microcontroller or pwm/spwm gate driving signals ... e4(-) and g4 c2e1 and c4e3 pins are AC output pins. its name is igbt inverter.
ac
dc
convert
transformer
solar
inverter
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162
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1
answer
asked
May 2, 2020
by
anonymous
Define: i) Input Offset Voltage ii) Input offset Current iii) Input Bias Current iv) Output offset voltage
Define: i) Input Offset Voltage ii) Input offset Current iii) Input Bias Current iv) Output offset voltage
Last answer:
Definition of parameters of OPAMP is follows: i) Input Offset Voltage: Input offset voltage is defined as the voltage that must be applied between the two input terminals of an OPAMP to null or ... to ground) and output voltage is obtained non zero such voltage is output offset voltage of opamp.
define
i
input
offset
voltage
ii
current
iii
bias
iv
output
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190
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1
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asked
Sep 22, 2018
by
anonymous
Describe the following energy conservation methods of lighting system. i) By replacing lamp sources ii) Using light control gears.
Describe the following energy conservation methods of lighting system. i) By replacing lamp sources ii) Using light control gears.
Last answer:
Energy conservation methods of lighting system: i) By replacing lamp sources: Installation of energy efficient fluorescent lamps in place of Conventional fluorescent lamps. Installation of ... (HF) electronic ballasts in place of conventional ballasts which saves energy up to 35%.
energy
conservation
methods
lighting
system
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76
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1
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asked
Sep 22, 2018
by
anonymous
Describe the following energy conservation methods of electrical motor. i) By motor survey ii) By matching loads with motor rating
Describe the following energy conservation methods of electrical motor. i) By motor survey ii) By matching loads with motor rating
Last answer:
Energy conservation methods of electrical motor: 1) By Motor Survey: Large industries have a massive population of LT motors. Load survey of LT motors can be taken-up methodically to ... -speed motors, eddy-current couplings, fluid couplings, and solid-state electronic variable speed drives.
energy
conservation
methods
electrical
motor
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172
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1
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asked
Apr 30, 2018
by
anonymous
Identify the correct combination of respective Electric arc welding and Electric resistance welding methods :
Identify the correct combination of respective Electric arc welding and Electric resistance welding methods : (A) Butt welding and Seam welding (B) Hydrogen shielding and Projection welding (C) Seam welding and Coated electrode welding (D) Coated electrode welding and Hydrogen shielding
Last answer:
Identify the correct combination of respective Electric arc welding and Electric resistance welding methods : (A) Butt welding and Seam welding (B) Hydrogen shielding and Projection welding ... Seam welding and Coated electrode welding (D) Coated electrode welding and Hydrogen shielding
electric
arc
welding
resistance
methods
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78
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1
answer
asked
Dec 16, 2017
by
anonymous
What are the speed control methods of dc motor?
What are the speed control methods of dc motor?
Last answer:
Field control of DC motor Armature control of DC motor
speed
control
methods
dc
motor
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150
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2
answers
asked
May 7, 2020
by
anonymous
List different starting methods of three phase synchronous motor. Explain any one of them.
List different starting methods of three phase synchronous motor. Explain any one of them.
Last answer:
Different Starting Methods of Three Phase Synchronous Motor: As synchronous motor is not self starting, different methods of starting are as follows: 1) By using an Induction (Pony) motor 2) ... . The rotor gets pulled into synchronism and starts running at constant speed as a synchronous motor.
list
different
starting
methods
of
three
phase
synchronous
motor
explain
any
one
them
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66
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1
answer
asked
Jun 27, 2020
by
anonymous
List the different level measurement methods.
List the different level measurement methods.
Last answer:
Liquid Level Measurement Direct method 1. Hook type 2. Sight glass gype 3. Float type 4. Dip stick Indirect method 1. Hydraustatic pressure type 2. Electrical type a) Capacitance level indicator b) Radiation level detector c) Ultrasonic level gauge 3. Radar type
different
level
measurement
methods
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23
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1
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asked
Sep 6, 2018
by
anonymous
List the different methods to produce damping torque.
List the different methods to produce damping torque.
Last answer:
Methods of providing damping torque in indicating type instruments: 1) Air friction damping. 2) Fluid friction damping. 3) Eddy current damping.
different
methods
produce
damping
torque
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64
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1
answer
asked
Jul 24, 2019
by
anonymous
List various transistor biasing methods.
List various transistor biasing methods.
Last answer:
Types of biasing methods: i. Base bias (or fixed bias) ii. Base bias with emitter feedback. iii. Base bias with collector feedback iv. Voltage divider bias (or self bias) v. Emitter bias.
transistor
biasing
methods
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57
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1
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asked
Apr 28, 2018
by
anonymous
The direction of rotation of an inverter fed 3-phase ac motor is reversed by
The direction of rotation of an inverter fed 3-phase ac motor is reversed by (A) a mechanical reversing switch (B) reversing the input dc link voltage (C) operating the inverter as a rectifier (D) changing the sequence of switching
Last answer:
The direction of rotation of an inverter fed 3-phase ac motor is reversed by changing the sequence of switching
direction
rotation
inverter
fed
3-phase
ac
motor
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117
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1
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asked
Aug 29, 2019
by
anonymous
What is means inverter topology and name different inverter typologies?
What is means inverter topology and name different inverter typologies?
Last answer:
Topology is the circuit arrangement. Generally 6 IGBT's for an inverter, all switching at high frequency to chop DC into AC. Most often used as a power supply or to control a motor but also as the power converter in a solar system as mentioned already.
inverter
topology
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93
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2
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asked
Jul 22, 2019
by
anonymous
Draw CMOS inverter characteristic and explain it.
Draw CMOS inverter characteristic and explain it.
Last answer:
Characteristics: The characteristics of CMOS inverter depend on the charging and discharging of the load capacitance CL through the PMOS and NMOS transistors respectively. The finite time taken for this charging ... pass from input to output High-to-low delay (tdf) Low-to-high delay (tdr)
cmos
inverter
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68
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1
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asked
Dec 15, 2017
by
anonymous
What is an inverter gate?
What is an inverter gate?
Last answer:
Not gate is known as inverter gate as it inverts the I/P
inverter
gate
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108
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1
answer
...