Answer Posted / rohith sathees
Traditionally, these are DC series-wound motors, usually
running on approximately 600 volts. The availability of
high-powered semiconductors (such as thyristors and the
IGBT) has now made practical the use of much simpler,
higher-reliability AC induction motors known as
asynchronous traction motors.
source: wikipedia
| Is This Answer Correct ? | 10 Yes | 0 No |
Post New Answer View All Answers
When a single pase capacitor run motor- run on 230vac and Case(1)run with 8 Mfd 250 vac.capacitor , Case( 2) run with 8 Mfd 400vac capacitor. What is difference between both case regarding power ,efficiency etc?
My load is 1635 KW. & current pf is 0.884, I have to improve it for 0.99.Please suggest what KVAR value is needed?
how to find 5 kilo meter long under ground 33 kv cable fault location if IR VALUE shows 0.05 M ohm @5000 volt.and cable fault locator shows some time fault distance 3 kilo meter ,3.7 kilo meter and some time 1 kilo meter? now how to find the fault location that where is leakage. note--it is tested with 5000 kv megger and insulation resistance is 0.05 M ohm. and some time 0.03 M ohm comes.
What are the advantages of stationary armature and rotating field system?
Factory acceptance test. FAT. For 132 kv transmisstion towers what is that meaning and what are the tests commonly companies perform now days.
what is differentila pilot supervision in the incomer control panel in the power station?
While testing LA mast,What are the parameter limits ?
when measure the core loss of three phase distribution transformer or three phase reactor loss, one phase shown negative watt loss. why??
any one please tell taht what type questions will be asked in BHEL interview, i am having interview on 24th Dec, please send this to mail pradeepsistam@yahoo.co.in
Explain what cmos is and its benefits?
We need to current density & short circuit calculation at 65kA for aluminium & copper busbar.
harmonics filter
Is any AC drive(VFD) had a feature of DC injection braking? if available please mention the detail. i.e drive can supply braking torque when the motor in idle state.
What do you mean by screen of power cables?
which protection function should measure RMS value of current&DFT value of current?
