Define the string efficiency
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- What is practical application of PWM?(b) Briefly explain the energy losses in a ferromagnetic core.8 = 0 Q1: What does happen if we change two currents? Q2: What does happen if we have a three-phase four poles machine? a Q3: What does happen if we have a two-phase two poles machine? Q4: What does happen if we apply a capacitance in phase b and then use same voltage for both phase. Dr. Ali K....p. . --
- 4.Suspension string has 3 units. Each unit can with stand a maximum voltage of 11kV. The capacitance of each joint and metal work is 30 percent of the capacitance of each disc. Find i) Maximum line voltage for which the string can be used?In the circuit in Figure 2, the capacitor connected to the a-b terminals of the transformer anda circuit consisting of resistance is defined as a load circuit. a)Find the average power spent by the load circuit? b) How much of the average power calculated in a) by the resistance in the load circuit and how muchspent by the capacitor? Comment on the results obtained?e = 0 Q1: What does happen if we change two currents? a. Q2: What does happen if we have a three-phase four poles machine? Q3: What does happen if we have a two-phase two poles machine? e = 0 Q4: What does happen if we apply a capacitance in phase b and then use same voltage for both phase. Dr. Ali Ki. pw --
- Amagnetic field is being generated by a current of 2.0A flowing through 180 turns of wire on a core having a reluctance of 210000.0 At/Wb. Determine the flux of the circuit in mWb.Figure Q1(a) shows a piece of ferromagnetic core with magnetic flux (B) with circular current (I) around the core. Figure Q1(b) show laminated ferromagnetic core with the same magnetic flux (B) and circular currents. With the aid of diagrams, explain how the current as highlighted in red (I) is developed in the ferromagnetic core in Figure Q1(a). B (a) (b) Figure 1(a) A ferromagnetic core and (b) laminated ferromagnetic coreIf the cross sectional area of a conductor is doubled, then the resistance of the conductor remains the same. becomes half of the initial value. becomes double the initial value. becomes four times the initial value.
- What is dimensional formula of conductivity ,it's unit and answer in well manner step wise and also formula of conductivity?Which of the following is not true for ferromagnetic materials? Please choose one: a. High?mthey have value. b.Above the Curie temperature, they lose their non-linear properties. C. a fixedµrthey have value. D.The energy loss is proportional to the area of the hysteresis loop.Q.4/ choose true or false: 1. The reluctance of any core is proportional directly with the length of it and inversely with both the permeability and the cross-section area of it. 2. The number of parallel paths in wave windings is equal to twice of the number of poles. 3. In dc machines with same values of Z, N, Ø, the emf for wave winding type is more than emf of lab winding type. 4. If we insert a current in such a conductor subjected to a constant magnetic field, a movement will achieved giving the principle of electric generator.