What are the effects of hunting?

What are the effects of hunting?
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1 Answer

Answer :

Loses synchronism
Develops mechanical stress on rotor shaft
Increase machine losses
Increase temperature of machine
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Related questions

Hunting of a synchronous motor:

Description : Hunting of a synchronous motor:

Last Answer : When the mechanical load is constant, the rotor settles down to an absolutely constant speed with the torque angle fixed by the particular delivered power. When there is a change in load the rotor speed ... are short circuited; copper bars are embedded in the faces of the field poles of the motor.

What is hunting?

Description : What is hunting?

Last Answer : The sudden changes of load on synchronous motor set up oscillations in the rotor. Such oscillation of rotor about its new equilibrium position is called hunting.

What could be the reasons if a 3-phase synchronous motor fails to start?

Description : What could be the reasons if a 3-phase synchronous motor fails to start?

Last Answer : It is usually due to the following reasons a. Voltage may be too low. b. Too much starting load. c. Open circuit in one phase or short circuit. d. Field excitation may be excessive

A synchronous motor starts as usual but fails to develop its full torque. What could it be due to?

Description : A synchronous motor starts as usual but fails to develop its full torque. What could it be due to?

Last Answer : a. Exciter voltage may be too low. b. Field spool may be reversed c. There may be either open-circuit or short-circuit in the field.

In what way synchronous motor is different from other motors?

Description : In what way synchronous motor is different from other motors?

Last Answer : All dc and ac motors work on the same principle. Synchronous motor operates due to magnetic locking taking place between stator and rotor magnetic fields.

State the characteristic features of synchronous motor.

Description : State the characteristic features of synchronous motor.

Last Answer : a. the motor is not inherently self starting b. The speed of operation is always in synchronous with the supply frequency irrespective of load conditions c. The motor is capable of operating at any power factor.

Write the applications of synchronous motor.

Description : Write the applications of synchronous motor.

Last Answer : a. Used for power factor improvement in sub-stations and in industries. b. As synchronous condenser c. Used for constant speed applications

What are V and inverted V curves of synchronous motor ?

Description : What are V and inverted V curves of synchronous motor ?

Last Answer : The variation of magnitude of line current with respect to the field current is called V curve . The variation of power factor with respect to the field current is called inverted V curve.

How the synchronous motor can be used as s synchronous condenser?

Description : How the synchronous motor can be used as s synchronous condenser?

Last Answer : Synchronous motor is operated on over excitation so as to draw leading reactive current and power from the supply lines. This compensates the lagging current and power requirement of the load making ... to become unity. The motor does the job of capacitors and hence called as synchronous condenser.

Distinguish between synchronous phase modifier and synchronous condenser

Description : Distinguish between synchronous phase modifier and synchronous condenser

Last Answer : A synchronous motor used to change the power factor or power factor in the supply lines is called synchronous phase modifier. A synchronous motor operated at no load with over excitation condition to draw large leading reactive current and power is called a synchronous condenser.

What is synchronous condenser?

Description : What is synchronous condenser?

Last Answer : An over-excited synchronous motor under no load , used for the improvement of power factor is called as synchronous condenser because, like a capacitor it takes a leading current.

What is critical excitation?

Description : What is critical excitation?

Last Answer : The excitation for which power factor of the synchronous motor is unity and the back emf is equal to supply voltage.

What is over excitation?

Description : What is over excitation?

Last Answer : The excitation for which power factor of the synchronous motor is leading and the back emf is greater than supply voltage.

What is under excitation?

Description : What is under excitation?

Last Answer : The excitation for which power factor of the synchronous motor is lagging and the back emf is less than supply voltage.

What is normal excitation?

Description : What is normal excitation?

Last Answer : The excitation for which power factor of the synchronous motor is lagging and the back emf is equal to supply voltage.

Why a synchronous motor is a constant speed motor?

Description : Why a synchronous motor is a constant speed motor?

Last Answer : When load increase in synchronous motor the load angle δ also increases but speed remains constant. The further increase in load cause further increase in load angle. When load angle reaches ... out of synchronism. Hence the motor rotates at synchronous speed otherwise it comes out of synchronism.

What is the effect on speed if the load is increased on a 3 phase synchronous motor?

Description : What is the effect on speed if the load is increased on a 3 phase synchronous motor?

Last Answer : The speed of operation remains constant from no load to maximum load in the motor operating at constant frequency bus bars.

What is pull out torque?

Description : What is pull out torque?

Last Answer : The maximum torque developed by the motor without pulling out of synchronism is called pull out torque. Its value varies from 1.5 to 3.5 times full load torque.

What is pull in torque?

Description : What is pull in torque?

Last Answer : The torque which is required to pull the motor into synchronism when it is running as induction motor is called pull in torque.

What is the function of damper winding?

Description : What is the function of damper winding?

Last Answer : To provide starting torque To prevent or minimize hunting

Why damper windings are used in synchronous motor? Or How synchronous motor is started as squirrel cage motor?

Description : Why damper windings are used in synchronous motor? Or How synchronous motor is started as squirrel cage motor?

Last Answer : The damper winding consists of short circuited copper bars embedded in the the face of the rotor poles. When an ac supply is provided to stator of a 3-phase synchronous motor, stator winding produces ... magnetic field and damper winding is zero. Hence there will be no emf induced in damper winding.

What is pony motor starting?

Description : What is pony motor starting?

Last Answer : In this method the rotor is made to rotate by some external device called pony motors. Once the rotor attains synchronous speed, the DC excitation to the rotor is switched on. Once synchronism is established the pony motor is decoupled. The synchronous motor continuously runs at synchronous speed.

What are the methods of starting synchronous motor?

Description : What are the methods of starting synchronous motor?

Last Answer : 1. Pony motor starting( using ac or dc motor) 2. Starting as squirrel cage Induction motor or using damper winding 3. Starting as slip ring Induction motor or synchronous motor 4. Using dc machine coupled to it.

Why synchronous motor is not self starting?

Description : Why synchronous motor is not self starting?

Last Answer : Synchronous motor is a doubly excited machine i.e two electrical inputs are provided to it. It's stator winding which consists of a 3 phase winding is provided with 3 phase supply and rotor ... due to attractive or repulsive force and remain in standstill condition. Hence it is not self starting.

What are there the long term and short term effects of over hunting ?

Description : What are there the long term and short term effects of over hunting ?

Last Answer : serious reduction of species population or harm to wildlife

Hysteresis in a direct current generator is indicated by _____________. A. arcing at the brushes B. pulsating terminal current C. heating of the armature core D. hunting and over control

Description : Hysteresis in a direct current generator is indicated by _____________. A. arcing at the brushes B. pulsating terminal current C. heating of the armature core D. hunting and over control

Last Answer : Answer: C

If the driving torque, such as that produced by a diesel engine, creates pulsations when coupled with a synchronous generator operating in parallel; the generator rotor may be periodically pulled ahead or behind its normal position as it rotates. This co A. hunting B. direct coupling C. peaking D. harmonic coupling

Description : If the driving torque, such as that produced by a diesel engine, creates pulsations when coupled with a synchronous generator operating in parallel; the generator rotor may be periodically pulled ahead or behind ... as it rotates. This co A. hunting B. direct coupling C. peaking D. harmonic coupling

Last Answer : Answer: A

In the illustration, the diode between terminals 16 and 17 is to _________. EL-0046 A. act as a short circuit for the sensing coil when CEMF is applied B. insure that the voltage across the coil does not exceed 9 volts C. improve response time D. act as a filter to prevent hunting

Description : In the illustration, the diode between terminals 16 and 17 is to _________. EL-0046 A. act as a short circuit for the sensing coil when CEMF is applied B. insure that the voltage across the coil does not exceed 9 volts C. improve response time D. act as a filter to prevent hunting

Last Answer : Answer: A

In the illustration, the diode between terminals 16 and 17 is to _________. EL-0046 A. insure that the voltage across the governor coil (EG-3P) never exceeds .6 VDC B. compensate for the temperature difference of the governor oil heating up C. protect the electronic governor from counter EMF D. act as a filter to prevent hunting

Description : In the illustration, the diode between terminals 16 and 17 is to _________. EL-0046 A. insure that the voltage across the governor coil (EG-3P) never exceeds .6 VDC B. compensate for the ... heating up C. protect the electronic governor from counter EMF D. act as a filter to prevent hunting

Last Answer : Answer: C

What is hunting effect?

Description : What is hunting effect?

Last Answer : When the load is varied to the motor the oscillation being setup in the rotor about the position of equilibrium corresponding to change of load condition. So the damper winding acts the magnetic lines ... rotor is known as Hunting or Phase swinging. To reduce this hunting damper winding is helpful.

Is O.J. Simpson still hunting for the real killers?

Description : Is O.J. Simpson still hunting for the real killers?

Last Answer : I seriously doubt it! We would have heard about his search from time to time if he was.

Is there a connection between sport hunting, and killing for no reason, other than for fun? Please read details.?

Description : Is there a connection between sport hunting, and killing for no reason, other than for fun? Please read details.?

Last Answer : Isn’t that pretty much the definition of sport hunting? I suppose you can hunt for trophies, if you’re hunting for food, I guess the fun is in dining.

After recent social media backlash against the sport hunting industry, do you think sport hunting will continue, but hunters will no longer post and brag about it?

Description : After recent social media backlash against the sport hunting industry, do you think sport hunting will continue, but hunters will no longer post and brag about it?

Last Answer : answer:I don't think anything will change. The only reason why this got such publicity is because it was a famous and frequently photographed lion. If it hadn't been a famous lion - but instead ... episode will be forgotten - by everyone - within a month. Passing fad. No serious changes will happen.

What if we were descended from swimming apes, rather than from hunting apes?

Description : What if we were descended from swimming apes, rather than from hunting apes?

Last Answer : answer:We'd probably look like dolphins. Hair creates drag and doesn't insulate in water, unless it becomes thick enough to function like beaver or otter coats - so I guess we could've become dramatically hairier. ... top of our heads oh, wow, I'm getting a pretty ugly mental image of a sea-human.

Can anyone tell me what creature am I hunting?

Description : Can anyone tell me what creature am I hunting?

Last Answer : It very well could be a gecko or other small lizard. We have lots of them here, and they’re completely harmless. Since they eat insects, they’re beneficial.

Any work or job hunting resources in Denver, CO?

Description : Any work or job hunting resources in Denver, CO?

Last Answer : Have you tried Indeed.com ? It’s a pretty solid site where you can narrow down jobs based on pay as well. I consider it a pretty standard site like Monster and Careerbuilder, but whenever I mention it to someone, they seem to have never heard of it before.

What is it about the wild primitive sound of a pack of coyotes hunting and howling at night that touches someplace deep inside of you?

Description : What is it about the wild primitive sound of a pack of coyotes hunting and howling at night that touches someplace deep inside of you?

Last Answer : answer:They were more likely defining or claiming their territory from the neighboring groups of coyotes, especially at night. They generally don't vocalize much when hunting, they don't want to give ... been when I find the seam between two rival groups and start using challenge calls on them.

Why do so many people find game hunting repugnant, even if you are going to eat the kill afterwards?

Description : Why do so many people find game hunting repugnant, even if you are going to eat the kill afterwards?

Last Answer : answer:I can't speak for anyone else, but I can tell you why I don't like it. It's because people enjoy it. I fully understand hunting when it's either that or you don't eat, and I would do it ... for it to actually be a sport, the animals would have to know they are playing, and be armed as well.

How do you feel about hunting for sport?

Description : How do you feel about hunting for sport?

Last Answer : I don’t really like it. If you don’t need to hunt to eat then don’t shoot at living things. Go to the shooting range.

Is there a way to enjoy a hunting trip without killing animals?

Description : Is there a way to enjoy a hunting trip without killing animals?

Last Answer : Why can’t you go into the woods and enjoy a wilderness experience without planning to kill anything. Take a camera instead of a gun.

What websites do you use for job hunting?

Description : What websites do you use for job hunting?

Last Answer : I use CareerBuilder and a local one for my city Citynamejobs. com. I haven’t had much luck with Monster, but that’s just me. There is also a job site through our states unemployment office that I look at daily.

Would you go bargain hunting if you had boat loads of cash?

Description : Would you go bargain hunting if you had boat loads of cash?

Last Answer : Nope, I would not – but I know some very rich people who do.

Is hunting for sport nothing more than a socially accepted form of sadism?

Description : Is hunting for sport nothing more than a socially accepted form of sadism?

Last Answer : answer:I imagine (but I could be totally wrong here not knowing much about it ) that those in favour of hunting' will argue that hunting is never just for sport'; there is always a purpose for ... for sport I agree with you it is just a form of perhaps in some circles socially accepted sadism!

What should I know about apartment hunting that one isn't usually aware of?

Description : What should I know about apartment hunting that one isn't usually aware of?

Last Answer : answer:Be sure to asking about laundry facilities (whether there is a washer/dryer in each unit or a public one somewhere i the building). It's also good to ask what is included in your rent (such as ... to do a very thorough move in inspection. Make notes of every defect, no matter how small it is.

What are your opinions about hunting?

Description : What are your opinions about hunting?

Last Answer : For food or crop protection yes. As pure sport, no. I’m an avid target- shooter but only shoot critters nibbling at my garden.

Can you advise me on the winning formula for job-hunting/ interviews?

Description : Can you advise me on the winning formula for job-hunting/ interviews?

Last Answer : I would definitely put volunteer work on the CV. A more appropriate place to mention your past circumstances might be the cover letter, something along the lines of now that you have overcome a serious ... to explain in person at the interview, if you are asked about the gap in your work history.

Scent free while deer hunting?

Description : Scent free while deer hunting?

Last Answer : Use an unscented glycerin soap as opposed to a standard bar soap when showering. You will not get soap scum left behind on your skin which leaves scent.

What are deer hunting season hours in mn?

Description : What are deer hunting season hours in mn?

Last Answer : Try this page.

Is Shopping like some sort of Civilized, Sophisticated Modern Day Equivalent to the Hunting and Killing We did Way Back in Time, Like the 1960s?

Description : Is Shopping like some sort of Civilized, Sophisticated Modern Day Equivalent to the Hunting and Killing We did Way Back in Time, Like the 1960s?

Last Answer : Shopping for food?

Legality of blowgun hunting/fishing. . .

Description : Legality of blowgun hunting/fishing. . .

Last Answer : If you go out in the woods to blow anything in Texas, you’re in trouble.