If the field winding of a DC shunt motor gets disconnected while in normal operation the speed will decrease to a tremendously low value and the motor may get stop. * O True O False
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- Write the answer using clear explanations, details and diagrams:A load is attached to a synchronous motor. What will happen when the load is changed on this motor? As the synchronous motor requires adjusting field current, what effects does a change in field current have on the synchronous motor? Explain the effects of the changing parameters with the proper phasor diagram.Your Answers may be presented through Discussions, Drawings/Figures/Diagrams, Reference to NEC/PEC and Computations What is the full-load current of a 230-volt, 3-phase, 125-horsepower synchronous motor when it is operated at an 80% power factor?If the armature resistance of a 3-phase, 318.75 kVA, 2300-V synchronous generator is 0.35 ohms per phase, the synchronous reactance is It is 1.2 ohms. Calculate the excitation voltage and voltage regulation for the following load cases: a) Full load, back power factor of 0.8 and rated voltage. b) Full load, forward power factor of 0.6 and rated voltage.
- 3. Why integral wind-up is harmful in a closed-loop system? Explain.The following information is given for a 300 kw, 600 V long shunt compound generator. Shunt field resistance = 75 Ω, armature resistance including brush resistance = 0.03 Ω, commutating field winding resistance = 0.011 Ω, series field resistance = 0.012 Ω, diverter resistance = 0.036 Ω. When the machine is delivering full load, calculate the voltage, power generated by the armature and efficiency.A 25-horsepower, 230V, 60Hz, 3-phase induction motor has a Nameplate Rating of 58amperes. The nameplate also shows a temperature rise of 30°C. a) Determine the THHN Cable and TW grounding conductors.b) Conduit Size using EMTc) What is the overload size for this motor?d) Determine the locked rotor current if the motor is Code J.e) Determine the Dual-element, time-delay fuses to be used for the motor’s branch circuit.
- What happened to the dc if it runs without any starter?explain in details with diagramWhich dc motor is used in fan??(be quick)Using the 2 different 'single phase equivalent circuits' given below, the desired equations will be deducted. Equations separately for asynchronous motor powered by voltage source will be removed and the spaces given below will be written. You can also do your inference work. show it and deliver it. V1 and I1 are the RMS value of the AC phase voltage and current. All formulas (3 phase motor) will be written as a function of motor parameters and slip.