what is meant by crawling??

Answers were Sorted based on User's Feedback



what is meant by crawling??..

Answer / ebrahim.p.b

it has been found that induction motors,particularly the
squirrel cage type,sometimes exhibit a tendency to run
stably at a speeds as low as one-seventh of their
synchronous speed.it is known as crawling.

Is This Answer Correct ?    15 Yes 3 No

what is meant by crawling??..

Answer / hari hajare

Crawling in an induction motor is caused by low supply
voltage, high loads, development of harmonics in the rotor,
possibly even design faults. Crawling can be caused when a
small change in load results in an angular displacement of
the rotor field with respect to the stator field a bit
similar to the synchronous motor operation. The effects of
crawling can be reduced by avoiding certain combinations of
stator and rotor slots or altering the position of rotor
bars(skewing).

Is This Answer Correct ?    12 Yes 5 No

what is meant by crawling??..

Answer / arif mondal

The phenomenon of 3 phase Induction motor when runs at
1/7th of its full speed constantly due to the presence of
odd harmonics (generally 5th,7th) in the line is termed as
crawling.

Is This Answer Correct ?    9 Yes 6 No

what is meant by crawling??..

Answer / jai

Creating descriptive categories and file names for the
documents on
your website can not only help you keep your site better
organized,
but it could also lead to better crawling of your documents by
search engines. Also, it can create easier, "friendlier"
URLs for those
that want to link to your content. Visitors may be
intimidated by
extremely long and cryptic URLs that contain few
recognizable words.

Is This Answer Correct ?    3 Yes 1 No

what is meant by crawling??..

Answer / rajeshwar paste

The phenomena due to which motor runs at reduced speed due
to present of harmonics is called crawling.

Is This Answer Correct ?    8 Yes 7 No

what is meant by crawling??..

Answer / ravish gaurav

it has beenion motar found that induction motor particularly
squirrel cage type sometimes exhibits a tendency to run
stably at speed as low as 1/7th of their synchronous
speed.This phenomenonis known as crawling of an induction motar

Is This Answer Correct ?    2 Yes 1 No

what is meant by crawling??..

Answer / sreeram

Due to odd harmonics like 5th nd 7th present in rotor which has reduce the speed of IM at constant loads
which is 1 by 7th of their full load speed

Is This Answer Correct ?    0 Yes 0 No

what is meant by crawling??..

Answer / aditya singh

The stable operation of induction motor near sub-synchronous speed Ns/7 is called crawling which is accompanied by much higher stator current, noise and vibration.
here Ns=asynchronous speed of induction motor

Is This Answer Correct ?    0 Yes 1 No

what is meant by crawling??..

Answer / balaji

i agree wit all

Balaji TK

Is This Answer Correct ?    3 Yes 7 No

what is meant by crawling??..

Answer / bhanutej

under odd harmonic that is 13th harmonic motor runs it 1/7
th of its actual speed .

Is This Answer Correct ?    0 Yes 6 No

Post New Answer

More Electrical Engineering Interview Questions

When we need start the motor by method of star delta which size (KW or HP)motor should must be operate in Star Delta Method,

3 Answers  


what is the transformer efficiency?

5 Answers  


What should be setting for alarm,tripping and cooling fan on for power transformer's oil temp. and winding temp. indicator?

0 Answers  


what is the vvvf in the dumbwaiter?? or lift. what is the actual process?/

0 Answers  


What is mean 2XWY

0 Answers   Wilo,






in battery charging room we find two fuses (one in positive other in negative cables ).why it is so?one fuse is ore than sufficient?

0 Answers  


how to select the power contactor in Diffrent AC motors.

6 Answers   Titan,


what is demagnetising effect & crossmagnetising effect and how it is related to electrical system?is there any more effects are available or only these two??

1 Answers   Telco,


What is transformation ratio what it describes?

0 Answers   Cushman Wakefield,


what is use of lockout relay in ht voltage

2 Answers  


If a current -8+6sin6t is flowing three ammeter, one is a centre zero PMMC meter, one is true rms meter and one is moving iron meter. What are the reading of these three meter respectively?

0 Answers   National Insurance Company Limited,


how starting current in motor is reduced in case of motor in star connection.

4 Answers   Adhunik,


Categories
  • Civil Engineering Interview Questions Civil Engineering (5084)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4451)
  • Electrical Engineering Interview Questions Electrical Engineering (16631)
  • Electronics Communications Interview Questions Electronics Communications (3918)
  • Chemical Engineering Interview Questions Chemical Engineering (1094)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (239)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (259)
  • Instrumentation Interview Questions Instrumentation (3014)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (124)
  • Power Plant Engineering Interview Questions Power Plant Engineering (172)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (25)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1379)