Answer Posted / rathish
In any DC motor the speed depends inversely on the flux.
Consider when starting a series motor the current flowing
will be high, but the flux that the motor produces will be
moderate since the series winding has less number of turns.
If u start the motor without load the speed will increase.
as speed increases the back emf increases. this decreases
the current through the series winding and hence flux
decreases and the speed further increases. Theorerically
speaking the speed becomes infinite. But practically the
motor will accelerate to very high speed , which will damage
the motor. But if you start the motor with the load, you are
actually reducing the starting speed hence the motor runs
safely. Since series motors has this property it is used in
trains to pull high load.
shunt motor starting torque is
marginal and hence it should be started with least load.
Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
please send previous model paper to chvdnagesh.hr@gmail.com
Sir, Generally how long it ll take for RRB to release the results of exams which they conduct(i.e) for traffic apprentice,goods guard etc
Hi, i like to know the syllabus for RRB(Section Engineer- Electrical)? Whether the syllabus will be same for every RRB exam conducted in any state.I am Electrical engineer send me syllabus & previous question papers
please send me RRB SECTION ENGINEER previous papers or model papers and syllabus
i want rrb qustion papers
railway pharmacist
sir how can i get the solved papers and model papers for rrb exam for technician grad 2 sihnal?plz help me
please send me previous questionpapers of psychological test
Sir, please send me solved question paper for section and junior engineer(electrical)
Sir, I am Diploma in Mechanical Engineer holder and I have been applied RRB-Chennai now. I need RRB chennai JE mechanical last 5 year question papers Plz send me on this email id gunacpt@gmail.com
i need syllabus and previous year question papers for rrb section engineer in s&t department
plz send me the RRB recruitment information for mechanical engineers and also website .
Can tou send me RRB mumbai's section engg model exam papers?
sir i am selected as a bank clerk and i want leave for MBA 3rd sem exam should i will get leave for EXAM. tell me the process to get leave?
i want railway exam paper.