Electrical Machines – II Assignment 2024-2025 PDF

GOVERNMENT ENGINEERING COLLEGE, BHARUCH ELECTRICAL ENGINEERING DEPARTMENT B.E. 5th Semester: AY:2024-25 Assignment Course Name (Code): Electrical Machines – II...

GOVERNMENT ENGINEERING COLLEGE, BHARUCH ELECTRICAL ENGINEERING DEPARTMENT B.E. 5th Semester: AY:2024-25 Assignment Course Name (Code): Electrical Machines – II (3150910) Sr. QUESTIONS BT LEVEL COs No. 1. Explain the working of Double Cage Induction Motor Remember & CO-1 with neat diagram. Understand 2. State the conditions necessary for paralleling Remember & alternators. Explain one dark and two bright lamp CO-1 Understand methods with necessary electrical circuit diagram. 3. Explain the working of an Universal motor with neat Remember & CO-1 diagram. Understand 4. Prove that plain single-phase motor is not self-starting Apply & CO-1 using double-revolving theory. Analyze 5. Derive an equivalent circuit of single-phase Induction Understand & CO-2 motor. Apply 6. Explain the effect of varying excitation at constant Understand & CO-2 load on synchronous motor. Analyze 7. A 230V, 380W, 50Hz, 4-pole, 1-phase induction motor gave the following test results. No load test: 230 V, 84 W, 2.8 A; Apply & CO-3 Blocked rotor test: 110 V,460W, 6.2A Evaluate The stator winding resistance is 4.6 ohm and during the blocked rotor test the auxiliary winding is open. Estimate the equivalent circuit parameters. 8. A 3 phase, 6 poles, 2.3 KV, 200KVA, star connected synchronous motor has synchronous reactance of 12 ohm per phase and negligible resistance. The motor is initially operating at a load of 120KW with the field Apply & CO-3 current adjusted such that the armature current is Evaluate minimum. The field current is now increased such that the armature current is increased by 50%. With this field current, the load is reduced to 60KW. Estimate the new values of armature current and power factor. Sr. CO CO Statements No. Describe the construction, working principle and applications of 1. CO-1 induction machines and synchronous machines. Analyze the performance of rotating electrical machines using the 2. CO-2 tools like equivalent circuit, phasor diagram and circle diagram. Evaluate the performance parameters of rotating machines with 3. CO-3 different operating conditions.