why field resistance is higher than armature resistance in
dc machines? and why filed resistance is kept at min value
at starting in same time of armature resistance at max value?
- 4 Answers
- 30752 Views
- I also Faced
- E-Mail Answers
Answer Posted / sai
To allow the maximum current through the armature, resistance is kept to very low value. According to ohm's law, V=IR.
As R is very low then current becomes maximum.
| Is This Answer Correct ? | 21 Yes | 10 No |
Post New Answer View All Answers
What is instrumental error?
What is the range of the stator resistance of 3 phase induction motor?
Basic motor transformer generator
How do we arrive at selecting reactive capacitance value as 30% of h.p rating of motor?
My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I - is the value of AC fault current. t - is the operating time of disconnecting device in seconds. K – is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.
placing earthing pit in pathway is correct or wrong??. placing earthing wireGI1/18 inside walls is correct or wrong?. explain!!!
3phase cable calculation formula by motor load
What is a signal flow graph?
how can calculation ate Amps for cabel. Ex-for 1sqmm wire hou many amps we can draw
is it possible to turn on the single phase star delta on delay timer using 24 v dc ?
Meaning of ingrace protection for motor.for ex IPXY
Define active and passive network?
Is single load(eg: three phase motor) having all the components like positive,negative,zero sequence components during fault condition?
What happen to the transformer if the OLTC frequently used for lower and raise occured 50times daily?
area control error
