Answer Posted / kapil bahadure
Back emf :-DC motor connected to supply then magnetc flux
produced by armature windings.this magnetic flux oppose to
the supply voltage.its denoted by eb.7 also colled as
counter emf.eb occur in the dc machine.
eb=-V-IaRa.
| Is This Answer Correct ? | 6 Yes | 3 No |
Post New Answer View All Answers
Explain and give me an example of a time when you had to explain some new procedures to your co-workers for quality service delivery, how did you go about it?
If rotor works in clock wise what happens
my b-tech percentage is 50%. what answer will satisfy the hr ?
WE ARE PLACE A NEW 75 KW MOTOR FOR JPF.IT IS CONNECTED IN M.C.C. WHEN WE ARE STARTING M.C.C.INCOMER IS TRIPPED.THEN WE ARE CONNECTED IN P.C.C WITH A MM30 RELAY PROTECTION THEN WE ARE STARTED MOTOR WILL RUN SMOOTHLY.
hello if any one have papers vof hpcl or sail, plz send me
How to address the servo drive for motor
What is dynamo?How it works and what is the function of dynamo in a DG.
Can we use a absolute encoder to show rpm of a motor ? what about the condition when power is off ? what is difference if a incremental one is used ?abanirout@gmail.com
Shall I use 40A semiconductor Fuses in 32 A SFU ? Frame size is same. What Happen if Fuses burn on SFU?
What is speed mode?
how to calculate short circuit current for the busbar
What is the reason behind current flow(20 A) in amain earth cable of an SMDB? Is cuurent flow(45A etc) through a neutral cable acceptable?
When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<
What is the source of dependent source ?
What if high voltage side circuit breaker of a ehv transformer instead of lvcb? Kindly elaborate.