Interested to Buy Any Domain ? << Click Here >> for more details...
In a 3 phase squirrel cage induction motor why does rotor
rotate?
will 3 phase transformer rotate like a motor if it is
placed on bearings and powered up? give reason
- 10 Answers
- 28621 Views
- Siemens, I also Faced
- E-Mail Answers
Answer Posted / ramesh pachamal
Due to the rotating magnetic field in the stator induces an
emf in the rotor. As the rotor rings are short circuited a
current will flow through the rotor bars.As per the
faradays law, a current carrying rotor bar at magnetic
field it excerts force causes to rotate.
As the induction motor is called as rotating transformer,
the concept in both the group is same as mutual induction.
A modification of transformer can be done to rotate. This
is the purpose a heavy steelbelt is provided in the
secondary of the transformer normally. Eventhough the
secondary get force and will make airgap inside the winding
giving noise.(inductive reactance)
| Is This Answer Correct ? | 10 Yes | 8 No |
Post New Answer View All Answers
sir& friends i want the collection of recent quetions asked in interview of top most companies please send me on my email san.jsr@hotmail.com
sir my exam is on 19/6/2013 under electrical branch pls send me sample aptitude questions as well as sample technical questions for jindal steel and power company
we have require a Motor (1500kW, 6.6kV, 50Hz) which shall operate at 1500rpm during 30min and after it shall run on 500rpm during 15min. The same cycle shall be repetitive during the whole working days. Which method is best and economic to achieve such type of task. VFD, VVFD, Pole changing motor etc.
why do we lay up the core of a cable?
what is the relationship between current&voltage in practical purpose ?
Explain what is rated speed?
what is difference between elr and R eartl realy.
Explain about how is it working Earth fault'relay and wahts the resistance value of earth bed
is it value of power factor is more than unit. whats effects in the source supply
what is circuit recombiner and how it is different from circuit breaker
How could I get a certificate of competency as Electrical Supervisor? I have completed By BTech in Electrical this year(2012) for VJTI Mumbai Maharashtra. Is it compulsory to be produced while joining?
what are the stresses in circuit breakers ?
Which capacitor is preferred for high voltage and frequency?
What is EHT tariff or Power factor Tariff ????
how to calculate the no load current in transformer?
