prasad jandhyala

• Sep 6th, 2014

Synchronous motor acts as a condenser when it is operated at no load and over excited state. synchronous condensers are mainly used for power factor improvement.

Pramod kumar

• Sep 3rd, 2014

Synchronous motor behave as a condenser when it uses at no load and leading pf.

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Is there any case that we could face or find Voltage without Current and Current without Voltage?

N K WATTAS

• Aug 10th, 2016

1) Voltage without current:This situations can also happen when current is leading by 90 degree as compared to voltage.
2) Current without voltage: this situation can happen when current is laging voltage by 90 degree.

Mandeep kumar sinha

• Aug 10th, 2016

I know voltage without current when there is open circuit and current without voltage in the case of short circuit

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saginala13

 Profile Answers by saginala13 Questions by saginala13

• Jun 19th, 2010

Synchronous motor: we will give dc supply to the armature as a excitation, which causes revolving flux, so that motor will rotate at synchronous speed.if there is no excitation and the armature coils ...

GeeK_Percy

 Profile Answers by GeeK_Percy Questions by GeeK_Percy

• Oct 4th, 2009

Armature winding is 3 phase winding and is supplied with 3 phase supplyField is supplied with DC supplied First motor is run at syn speed to lock rotor in syn speed now load is applied Questioner is confused actually the rotating field is produced by armature not by field.

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If v=220V, I=25A, power factor=0.8, frequency=400Hz. If the motor runs for 3 hours, What is the power consumed?

bittu123

 Profile Answers by bittu123 Questions by bittu123

• Nov 10th, 2011

Calculating power, frequency and time is not required. P=V*I*Cos0 =220*25*0.8 =4400 watts answer But if you are looking for "How much energy motor consumed?" then you need time Energy consumed ...

dineshkumarsah.mj

 Profile Answers by dineshkumarsah.mj Questions by dineshkumarsah.mj

• Jun 15th, 2011

Here Freq was given was wrong P V*I*CosAA is power factor V is VoltageI is Current P 220*25*0.8P 4400wattsPower P is 4.4Kwatts for one hour.For 3 hrs 4.4KW*3 = 13.2KW

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Srinath

• Oct 6th, 2016

Can you elaborate the reason why we have cos angle for active power and sine angle for reactive power?

ABC

• Sep 4th, 2011

Bcz in impedence triangle(cos=b/h) R(resistance) is in the base and imepedence is hypotaneous.
power factor(cos )=R/Z. THATS WY WE are using cos in the power factor notation.

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SHATAKSHI

• Sep 2nd, 2011

You should be able to fully explain whatever you have written in your CV.

veena_gyanchandani

 Profile Answers by veena_gyanchandani Questions by veena_gyanchandani

• Feb 24th, 2010

First of all You should be confident for yourself.You should know about the company profile in which you are going, and why you want to join that company, what is so interesting about that company?If ...

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arun uday rana

 Profile Answers by arun uday rana Questions by arun uday rana

• Aug 8th, 2008

A synchronous motor act as a synch. Condenser when the its field winding is overexcited and there is no load attached with it. The basic application of this phenomenon can be seen in the hydro power p...

ASIF JAVAID

 Profile Answers by ASIF JAVAID Questions by ASIF JAVAID

• Dec 9th, 2007

Overexcited  synchronous motor behaves like a condenser  or a capacitor

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bharath

• Sep 8th, 2011

It is the unit of power and used to specify the rate of electrical energy is dissipated.

ramesh_1686

 Profile Answers by ramesh_1686 Questions by ramesh_1686

• Sep 7th, 2011

Watt is the unit of power.
1 watt= voltage x current x power factor

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SALMAN

• May 2nd, 2020

The MKS system is more popular than the CGS system. In measuring force alone the MKS system using newtons as the unit is widely accepted worldwide. Its counterpart in the CGS system is the dyne is sel...

Aditya more

• Oct 10th, 2019

In cgs system is measured in Centimeter ,Gram,Second
In mks system is measured in Meter ,Kilogram ,Second

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What is the purpose of coupling capacitor?

BALAKRISHNA

• Sep 2nd, 2012

Main purpose of coupling capacitor is, it removes the ripple voltage present in AC

krishna

• Jul 6th, 2012

3 phase capacitor checking method ( in delta ) give the power supply then check the amps ( all phase currents are same

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Ahmed Mohsen Fayed

• Feb 27th, 2012

Condenser (heat transfer), a device or unit used to condense vapor into liquid
A capacitor (formerly known as condenser) used to store energy in an electric field.Capacitors are widely used in electronic circuits for blocking direct current while allowing alternating current to pass.

Mannik

• Feb 26th, 2012

Condensor is device which convert the air into water. and capacitor is used to store the electrical charge as potential difference applied on it.

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Is it possible if their is no voltage then their is no current circulation or does it depend on circuit condition?

manojprabu

 Profile Answers by manojprabu Questions by manojprabu

• Apr 4th, 2009

You are right without voltage their is no current circulation in any circuit (EMF is electro motivate forces is the force that produces movement of electrons in circuit if it is closed)Voltage is the major source of current.

arun uday rana

 Profile Answers by arun uday rana Questions by arun uday rana

• Aug 2nd, 2008

Current is nothing but flow of charge inside the conductor. It is always true that any fluid or gas always flow from higher pressure to lower pressure (or temp.). It is same in the case of charged p...

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What is the difference between Earthing and Grounding?

soni ranjan mahapatra

• Apr 10th, 2013

actually there are no such difference between earthing and grounding. Earthing word we use with our installation equipments in domestic as well as in substation,grid etc. And if due to some fault occu...

Dayo

• Mar 26th, 2013

Like bttu said, there is no difference between them and you can also add bonding to the group. earthing is basically used in britain and few commonwealth countries while grounding is used in america.

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Why do we use neutral ct in a transformer?

anil kumar

• Jul 24th, 2017

We have not neutral CT in 10/12.5 mva transformer input voltage 132 /33 kv then what would be problem without neutral CT .
please reply

EEE

• Mar 18th, 2012

A neutral CT is usually connected to the neutral of a star connected transformer. for balanced condition the current through neutral is zero.but if any unbalance occurs such as a ground fault, then th...

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Explain why the secondary terminal of current transformer should not be lift open circuited.

ravs42

 Profile Answers by ravs42 Questions by ravs42

• Aug 21st, 2010

Due to high ratio,if the secondary is left open a very large voltage will be developed at the secondary.As a result the core vl be saturated n operator working nearby vl face severe accidents.

deepanshu_jadon

 Profile Answers by deepanshu_jadon Questions by deepanshu_jadon

• Mar 10th, 2010

In CT secondary side is not open because it has large voltage difference

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What is the difference between INVERTER and UPS?

prafulla patil

 Profile Answers by prafulla patil Questions by prafulla patil

• Oct 29th, 2010

The main difference between Inverter and UPS is switching time.Inverter switching time is inverter switching time is more than UPS , inverter Takes approx 500 millisecond to switch , that’s why ...

full61

 Profile Answers by full61 Questions by full61

• Apr 15th, 2010

Inverter converts only DC to AC but UPS converts AC to DC and then store it after that it convert DC to AC.

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Why OC test is carried out on low voltage side of transformer?

mahmoudp1

 Profile Answers by mahmoudp1 Questions by mahmoudp1

• May 3rd, 2012

The previous answers are right + to make an accurate measurement O.C test on LV side because the current is high on the low voltage so when we repeat the experiment we will get more results with the ...

Pratyush Singh

 Profile Answers by Pratyush Singh Questions by Pratyush Singh

• Jul 26th, 2011

Because during OC test, rated voltage is applied, hence the HV side is unsuitable to keep instruments, hence it is the HV side that is opened and the LV side is where instruments are placed (at their rated values)

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How reactive power is related to alternator? Wheather it is generated or consumed? Explain

bittu123

 Profile Answers by bittu123 Questions by bittu123

• Nov 9th, 2011

If alternator is Overexcited, it will deliver reactive power with lagging current while in Underexcited, it absorb reactive power with leading curreent But, it always(under or over-excited) deliver ...

buntysurat

 Profile Answers by buntysurat Questions by buntysurat

• Oct 23rd, 2009

An Inductive Load say Induction Motor connected to an Alternator requires Active (KW) & Reactive Power (KVAr) both. This Motor receives Apparent Power (KVA --> KW + KVAr) from th...

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Why do we maintain 50hz frequency? What happens when we change this frequency to any other value?

maxandrean

 Profile Answers by maxandrean Questions by maxandrean

• Jul 5th, 2010

AC Electrical Network need to have a syncron phase for them to work. Any differences in term of frequency will shift out this syncronisation and lead the whole system to fail.

sankar_jkpm

 Profile Answers by sankar_jkpm Questions by sankar_jkpm

• Feb 3rd, 2010

In our India, all the electrical power generation is based on 50 Hz. (50 cycles per second) with respect to the production of flux in alternator. So the electrical utility products are designed f...

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Why OC test is conducted on low voltage side?

A.santosh

• Jan 27th, 2012

If want to conduct OC test on HV side we need more turns of auto-transformer, as an engineers we should have to decrease the cost required for the test, so normally OC test is conducted on LV side since we need less turns of auto-transformer

sinhasunilk

 Profile Answers by sinhasunilk Questions by sinhasunilk

• Jul 12th, 2010

Voltage injection in LV side is convenient, The cable attached to LV side also need insulation suitable to LV voltage rating. If LV ia in the range of 440V and HV is of the range of 11KV, we may inject voltage in steps also through variac of 440V , Which is not possible if inject voltage in HV side.

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