This download link is referred from the post: PTU B.Tech 5th Semester Last 10 Years 2011-2021 Previous Question Papers|| Punjab Technical University
FirstRanker.com
Firstranker's choice
Roll No. HEEE [ 11 [] Total No. of Pages : 02
--- Content provided by FirstRanker.com ---
Total No. of Questions : 18B.Tech. (Electrical & Electronics)/(Electrical Engineering)/
(Electronics & Electrical) (Sem.=5)
ELECTRICAL MACHINE DESIGN
Subject Code : BTEE-504C-18
--- Content provided by FirstRanker.com ---
M.Code : 78705Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.
--- Content provided by FirstRanker.com ---
SECTION-A
Answer briefly :
- Write down the classification of magnetic materials:
- What are the factors that affect the size of rotating machines?
- What are the advantages of stepped core in transformers?
- How is iron loss reduced in transformers?
- How induction motor can be designed for best power factor?
- List the advantages of using open slots in induction motor.
- Define runaway speed of an alternator.
- Distinguish between salient pole and non-salient pole rotor alternators.
- Expand the terms: PMSM and SRM.
- What are the various limitations of traditional design of machines?
--- Content provided by FirstRanker.com ---
--- Content provided by FirstRanker.com ---
SECTION-B
- Discuss in detail the desirable properties and classification of insulating materials used in rotating machines.
- Calculate the core and window area required for a 1000 kVA, 6600/400 V, 50 Hz single phase core type transformer. Assume a maximum flux density of 1.25 Wb/m” and a current density of 2.5 A/mm². Voltage per turn is 30 V. Window space factor 0.32.
- Derive an expression for the output equation and output coefficient of induction motor.
- Derive the output equation of a synchronous machine.
- Describe the salient features of computer aided design of electrical machines. What are the advantages of computer aided design?
--- Content provided by FirstRanker.com ---
SECTION-C
--- Content provided by FirstRanker.com ---
- Explain the various cooling methods of dry type transformer and oil immersed transformer.
- Determine the approximate diameter and the length of stator core, the number of stator slots, and the number of stator conductors for a'11 kW, 400 V, three-phase, 4-pole, 1425 rpm, delta connected induction motor, Bav=0.45 Wb/m², ac=23000 ac/m, full-load efficiency is 0.85, power factor=0.88, L/Z=1"'The stator employs a double layer winding.
- Find the main dimensions of a 100 MVA, 11 kV, 50 Hz, 150 rpm, three phase water wheel generator. The average gap density is 0.65 Wb/m², and ampere conductors per metre are 40,000. The peripheral speed should not exceed 65 m/sec at normal running speed in order to limit the runaway peripheral speed.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.
--- Content provided by FirstRanker.com ---
This download link is referred from the post: PTU B.Tech 5th Semester Last 10 Years 2011-2021 Previous Question Papers|| Punjab Technical University
--- Content provided by FirstRanker.com ---