I think you probably mean a 'brake' test, not a 'break' test. A 'brake test' is performed to find the output power of any machine. In North America, this is commonly expressed as 'brake horsepower'; elsewhere it is expressed in 'watts'.
because we cannot apply to series motor
we can predetemine the efficiency of a dc machines working as a motor or generator
Friction and windage causes mechanical loss in DC machines.
All DC machines are works based on the principle of FARADAY'S LAW OF ELECTROMAGNETIC INDUCTION.
No
05 types of dc machines
machines
The DC Test was a test which students could take when applying for a Diploma course in nursing. The initials DC stood for Dennis Child, the test's creator.
Carbon brushes used in DC machines because carbon is soft material and it does not generate spikes when contact with commutator
Electro Magnetic Field
district of culumbia
because the dc motor will act as dc generator as same as dc generator acts as a dc motor .so it is called as dc machines.AnswerBecause generators and motors are machines, and operate on d.c.'A.C. machines' are generators, transformers, and motors which operate on a.c.