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Show that, "Three unbalanced phasors of a 3- system can be resolved into three balanced system of phasors."
Show that the per unit impedance referred to the circuits connected by a transformer is same, if same base MVA is taken for both circuits and base KVs have ratio equal to the transformation ratio.
What is the significance of sub-transient reactance and transient reactance in short circuit studies?
A 25 MVA, 11 kV generators with is connected through a transmission line and a transformer to a bus that supplies three identical motors as shown in Figure. Each motor has on a base of 5 MVA, 6.6 kV. The three-phase rating of the step up transformer is 25 MVA, 11/66 kV with a leakage reactance of 10% and that of the step-down transformer is 25 MVA, 66/6.6 kV with a leakage reactance of 10 %. The bus voltage at the motor is 6.6 kV when a three-phase fault occurs at the point 'P'.
For the specified fault, calculate- (i) The sub-transient current in the fault, (ii) The sub-transient current in the breaker-B
1. Eight kilometers below the surface of the ocean the pressure is 82Mpa. Determine the density of the seawater at this depth if the density at the surface is 1025kg/m3 and the average bulk modulus of elasticity is 2.3GPa.
If the manometer reading is 13.8 cm of water, what is the pressure difference in Pa?
a mixture of liquid water and vapour at 0.4 mpa with 13 percent quality is contained in a piston cylinder device. the mixture is then heated until the temparature is 200 degress Celcius, while the pressure remains constant, assume the process is reversible
a) Represent the process on a P-V diagram with respect to the saturation lines
b) determine the work done , the heat transferred and the internal energy change during the process
