Roll No. LTI [ L[ ]] Total No. of Pages : 02
Total No. of Questions : 18
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B.Tech. (EE) (2018 Batch) (Sem.-3)ELECTRICAL MACHINES-I
Subject Code : BTEE-303-18
M.Code : 76383
Time : 3 Hrs. Max. Marks : 60
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INSTRUCTIONS 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.
SECTION-A
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Write briefly :
- What do you mean by MMF? Explain.
- What is B-H curve? Discuss its significance.
- Discuss the importance of magnetic circuits in engineering.
- Explain what happens when a d.c. motor is connected across an a.c. supply?
- Why is it preferable to install two or more transformers in parallel than one large unit?
- What do you mean by the term Harmonics? Discuss.
- Discuss the significance of back emf in a DC machine.
- Explain the principle of DC machines.
- What do you mean by critical speed of DC machine? Explain.
- Why back to back test is performed in DC machine? Explain.
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SECTION-B
- Discuss (in detail) the working principle and construction of a single-phase transformer.
- Explain the open circuit characteristics of separately excited DC generator.
- What is the significance of magnetic flux lines? Discuss the influence of highly permeable materials on the magnetic flux lines.
- Discuss the function and constructional details of the following parts of the DC machine :
- Commutator
- Brush Assembly
- Interpoles
- Discuss the principle, construction and applications of an auto transformer.
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SECTION-C
- Discuss the VI characteristics and torque speed characteristics of separately excited, shunt and series motors.
- Explain the short circuit and open circuit tests of single-phase transformer. Also discuss the importance of these tests.
- Discuss the following :
- Three winding Transformer
- Speed control method of DC motor
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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.
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This download link is referred from the post: PTU B.Tech Question Papers 2020 December (All Branches)