0
The most common faults are i know as below:
a) brush carbon arcing due to high current and friction;
b) dust or dirt;
c) over temperature due to high ambient and excessive use;
d) overload and winding insulation failure
e)inadequate protection against heat and poor ventilation
Wiki User
∙ 12y ago
Wiki User
∙ 10y agoThe most common faults in a DC machine are: brush carbon arcing, dirt, overheating and overloading. Some of these are cause by inadequate protection against heat or improper ventilation.
Add your answer:
Earn +20 pts
Is a DC motor single excited or double excited?
It is doubly excited if it is sparately excited dc motor, singly excited if it is self excited machine
Advantage of dynamic braking in dc machines?
This helps the machine to stop easier. It is a much easier process to use and safer for everyone involved in the process.
Where The core losses in a dc machine occur in?
in a dc machine core losses occur both in stator and rortor but stator core losses are negligible as compared to rotor core losses because in stator constant dc flux is given and the statot conductor is stationary so there are no eddy losses and as the flux is stationary there are no hysteresis loassses also but in rotor armature winding is placed so here alternating field is induced which cuts the rortating conductors of rotor thereby inducing eddy as well as hysteresis losses fo any more info. contact zombie
When is it important to make sure to match the polarity of the meter leads to the polarity of the circuit being tested?
This is important when meter cannot display negative values, e.g. it is analogous meter with scale. Most digital meters can display negative values. P.S. I am amateur in elecrtonics.
What is the minimum number of domain controllers you should configure to ensure that a domain is fault tolerant?
It directly depends upon following things and u can think of more. 1. Organization requirements towards security ( intend of your policies and procedures) 2.Oraganizatioin maturity level 3.Application dependencies 4.Availability of service Really this depends on the szie of your domain. What might be overkill for one domain, might be very sparse for another. Another big factor is the geographic area of the network. If you had a big office here and a smaller office down the road in a different building, you'd probably be aswell to put a DC in the small office even if you did only have 4 or 5 computers in it, you could even make the DC a global catalogue. But no matter how many DC's you have. A WAN is never truly going to be fault tolerant. For example the sql slammer worm a few years back took down hundreds of WAN's.
What is the important of brush in DC machine?
The slip rings are the most important brush in DC machine.
What motor is NOT suitable for use as a DC machine?
What motor is NOT suitable for use as a DC machine?
What is swinburne's test of DC shunt motor?
swinburne's test on dc shunt machine is to predetermine the efficiency of the dc machine , but it is not accurate it is just like estimation of efficiency of dc shunt machine when it is run as a motor and a generator............................
What is an dc meachine?
it is a machine which operates on the dc power source.
How many types of DC machine?
05 types of dc machines
Is there a fault line in Washington D.C.?
There is no known major fault line to exist in the Washington DC area.
Derive emf equation of a DC machine?
equation of ac machine
How do you make DC generator?
A DC generator is a DC machine that is driven by an external rotating force. It is constructed the same as a DC motor.
Whether a pmbldc motor is a dc or ac motor?
PMBLDC machine is actually an ac machine and due to power electronics components it's output is dc ,so therefor it is called 'dc'
Why are the losses in a dc machine important to know?
Losses mean energy losses, which cost money, and most people like to know how much a machine is going to cost to run.
What component of a welding machine changes AC current to DC current?
Yes, it is normal for a welding machine to convert AC voltage to a DC voltage.
Are we able to do swinburne's test on all dc machine?
no
