what happen when dc shunt motor field is sudden open in
running condition
Answer Posted / n.ravi teja
when dc shunt motor operates at normal conditions the speed
is constant.and when ever a suddenly field is open, the
field winding is having inductive property so it does not
allow sudden changes in current.open ckt means current
zero.and the rotor(armature) is continue its running
condition because it is connected to generator rotor
shaft.but we know when a current carrying cunductor is
placed in a rotating magnetic field ,it cuts the magnetic
field and emf is induced.but when field is open no current
carrying current is there in that ckt.so no emf is
induced.we know emf is proportional to speed.so speed
decreases .
Is This Answer Correct ? | 2 Yes | 5 No |
Post New Answer View All Answers
10 Mtr Hight of Lighting Arrestar how much area coverd??
how to select the automotive wire size by mathematical calculation. for xenon headlamp with ballast. the ballast given data voltage 10-17v,current permenant 6amp, run up phase is 15amp, peak at swicth on max 400micro sec is 40amp.the sum of cable resistance is 150mohm.please provide referenc document if any for relating the peak at switch on current,time & wire wire size
why the check zone and main zone are used for Busbar Protn. scheem?
What is the end effect of linear induction motor ??
while starting a liquid starter ,is there any volage drop on water/soda on tank.can we touch the tank on starting?
Determine the BTU size of an aircon for 20 sq metre room
What is the different between conventional MCC and intelligent MCC? Common controller or controller for each bucket
why and where we use early make & late break contacts in protection?
How to design harmonic filter at the project stage without nowing the harmonics levels
what is reverse power relay brief explanation and in b/w where it is connected
what does mean of RCT and STR in diffrential CT?
what is the practical application of full adder circuit?
hi frenz,its aswathy.i hve aplied for the hpcl test on feb,pls send the test patern & the placement papers as soon as possible. mail-id :kjaswathy@gmail.com
PLEASE SEND ME NTPC RELATED INFORMATION LIKE WHICH TOPICS HAV MORE SCOPE,BOOKS TO READ,CUT OFF...PLEASE.mail at thiru.1203@gmail.com
hello!my name is sheikh iam preparing for indian engineering servieces,please send me the old question papers..to sheikhshaazforjobs@gmail.com