generally 2
dynamo
To change the polarity of a generator, you need to physically rearrange the excitation windings or change the direction of the current flow in the windings. This process typically involves disassembling the generator to access the windings and making the necessary adjustments. It is a complex task that should be done by a qualified technician.
An asynchronous password generator, has an authentication server that generates a challenge (a large number or string) which is encrypted with the private key of the token device and has that token device's public key so it can verify authenticity of the request (which is independent from the time factor). That challenge can also include a hash of transmitted data, so not only can the authentication be assured; but also the data integrity.
The armature.
It's speed and the number of poles.
your mum is 1 so you should know exactly what it is ;) :L
This case arises only in series dc generator current should be sent around the poles to magnetize. this current can the source(generator). current is passed through poles if it is loaded. but if it is not loaded current is zero through the field. load voltage should be zero actually.but this dont happen.we use generator frequently.due to this poles are partially magnetized this causes some voltage appear called residual voltageAnswerThere's no such thing as 'residual voltage'; you're confusing it with 'residual magnetism', which exists in the magnetic poles of a self-excited d.c. generator and which enables the build-up of its terminal voltage.
A generator's frequency is dictated by the power system frequency, and the number of poles in the generator. For 60 Hz power and a generator designed with two poles, the generator must turn at 3600RMPs (60 Hz * 60 seconds / minute). The magnetic flux is what induces the current in on the output winding. Spinning a synchronous generator faster or slower is not done to control the magnetic flux. The field winding voltage is varied to control this, and in turn control the output of the generator.
Frequency is a function of engine speed and the number of poles in the generator end. For instance, a speed of 1500 RPM turning a four-pole generator will produce 50 hz. The formula is: Frequency = (poles/2) * (RPM/60) From the formula, you can see that the same frequency would be produced by a two-pole generator spinning at 3000 RPM.
There is not enough information given to solve this problem. What is the speed of rotation?
Have a look at AuroraGenerators.com If it is diesel your looking at about 1 gallon per hour however likely you are not running at full load. You can expect to be using on average 0.5 gallons per hour on an Aurora Diesel Generator
draw the circut diagram of the MOD60 asynchronous binary counter