What is the critical load resistance?

The critical field resistance is defined as the maximum field circuit resistance (for a given speed) with which the shunt generator would just excite. The shunt generator will build up voltage only if field circuit resistance is less than critical field resistance.

What is critical load resistance in a DC shunt generator?

The critical field resistance (RC) of a DC shunt generator is defined as the maximum field circuit resistance with which the shunt generator would just excite. The voltage build-up in a shunt generator depends upon field circuit resistance.

What are critical resistance and critical speed explain these with the help of the open circuit characteristics of the generator and voltage build up process?

Critical speed is defined as the speed at which the given shunt field resistance is equal to the critical resistance. It is the speed at which the shunt generator just fails to build up its voltage without any external resistance in the field circuit. It is denoted by Nc.

What do you mean by critical field resistance and critical speed?

Answer:Critical Field Resistance: It is that value of the field resistance at which the D.C. shunt generator will fail to excite. Critical Speed: It is that speed for which the given shunt field resistance becomes the critical field resistance.

How do you find the critical resistance of a DC generator?

Generally data for plotting the open circuit characteristics is given. Plot the characteristics on the graph paper to the scale. Draw the tangent, to the initial part of this O.C.C. then the slope of this line is the critical resistance for the speed at which the data is given.

What is meant by critical speed?

Critical speed (nk) is the rotational speed at which acting dynamic forces cause a machine component (e. g. shaft, rotor) to vibrate at its natural frequency (also referred to as intrinsic frequency, fi) and can even result in resonant vibrations throughout the entire machine and pump set.

How do you calculate critical damping resistance?

1. For critical damping, assuming R, L, C in parallel, ζ=1 is obtained when R=12√LC. – Chu. Jun 9 ’17 at 12:43.
2. Now —- use that value for dampening your VDD LCR networks, to prevent VDD ringing. With 100uF and 10nH, you need 0.5 * sqrt(1e-8/1e-4) = 0.5 * sqrt(1e-4) = 0.5 * 10milliOhms.

How do you find the critical field?

the critical magnetic field is Bc = T. The existence of a critical magnetic field implies the existence of a maximum current in a wire of the superconducting material because the current itself generates a magnetic field according to Ampere’s law. the maximum current is Ic = Amperes.