what are the duties of commutator in motor and generator?

Answer Posted / jayaram

Incase of generator alternating current into unidrectional
current(dc).
Incase of motor direct current converts to alternating
current

Is This Answer Correct ?    15 Yes 4 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

what things to be considered when designing UPS

1299


i need previous entrence exam papers of nhpc.

2355


Batteries. What is the difference between Lead and Nickel batteries ?

1682


-What should be minimum value of insulation resistance and maximum value of earth resistance at any electrical instillation and what is method of testing the same.

1564


in single phase converter, the no.of scr's conducting during overlap a)1 b)2 c)3 d)4

1624






What are differences between Voltage, EMF & Potential difference ?

1389


before synchronizing an alternator,power factor is leading ,why?

1012


which connection is safer series or parallel?usually which connection we prefer at home?

8297


What is a advantage of Self Reset Lockout ? On Fault breaker get trip & fault no longer exist then self reset lockout how inform us?

1370


How to calculate energy stored in a capacitance

683


How many double suspension hardware fittings are required on a double circuit transmission tower?

1560


Do any one know exacatly when the results for NHPC held on 8th march 09 for engineering trainees will be released ?. if so please post it, i'm eager to know it.

1679


what is the vvvf in the dumbwaiter?? or lift. what is the actual process?/

1608


234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,

1735


can some one clearly explain why -48 volt DC use in telecom site????

1217