EEC 346 Rotating Electrical Machines Exam 2023
About this paper
Examination in Rotating Electrical Machines (EEC 346) for Level 300, mechanical option, Department of Electrical and Electronics Engineering, College of Technology, University of Buea. It covers the losses, armature resistance and efficiency of a direct-current shunt motor, a shunt generator, and the power flow, rotor copper loss and efficiency of a six-pole induction motor.
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University of Buea
College of Technology - COT
Rotating Electrical Machines
Exam · Second Semester · Level 300
From this paper
A 250 V, 25 kW d.c. shunt motor has a maximum efficiency of 89% when the shaft power is 20 kW and the speed 850 rpm. The resistance of the shunt field is 125 Ω. Determine 1.1 the rotational losses /4 marks 1.2 the armature resistance /4 marks 1.3 the efficiency, line current and speed when the armature current is 100 A /3×4 marks
A shunt generator has a terminal voltage of 160 V and a no-load emf of 168 V. The armature resistance is 0.03 Ω and the field resistance is 20 Ω. Find: 2.1 the armature current /7 marks 2.2 the field current /7 marks 2.3 the load current. /6 marks
At a glance
- Course code
- EEC346 (EEC 346)
- Type
- Exam
- Year
- 2023
- Level
- Level 300
- Semester
- Second Semester
- Proposed solution
- Included
Where it's from
University
University of BueaFaculty
College of Technology - COT
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