Exam Details
| Subject | Electrical Machines-I | |
| Paper | ||
| Exam / Course | Diploma -VIEP-Electrical Engineering (DELVI)/Advanced Level Certificate Course In Electrical Engineering (ACELVI) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2016 | |
| City, State | new delhi, |
Question Paper
No. of Printed Pages: 3 IBIEE-027I
DIPLOMA IN ELECTRICAL ENGINEERING (DELVI) I ADVANCED LEVEL CERTIFICATE COURSE IN ELECTRICAL ENGINEERING (ACELVI)
h i "-s Term-End Examination
June, 2016
BIEE-027 ELECTRICAL MACHINES
Time: 2 hours Maximum Marks: 70
Note: Attempt any five questions. Use of scientific calculator is allowed. Missing data, if any, may be suitably assumed.
1. Why is the efficiency of a transformer high as compared to other rotating machines? Suggest methods to enhance efficiency of a transformer. 4
Explain heat-run test of a single-phase transformer in detail. 10
2. What is an Auto transformer? State its merits and.demerits over the two-winding transformer. 7
Explain speed-torque characteristics of DC series and shunt motor. 7
3. Describe the constructional details of a DC machine. 7
The induced e.m.f. in a DC machine, when running at 500 rpm is 180 V. Calculate the induced e.m.f while the machine is running at 600 rpm by assuming flux to be constant. 7
4. State the reasons for operating transformers in parallel. Describe the advantages of using several small transformers in parallel over the use of a single large transformer. 7
Explain the process of commutation in DC machine and describe the methods to improve it. 7
5. Explain the various methods of speed control of a DC motor with neat sketches. 14
6. Draw and explain the external characteristics of shunt, series and compound generators. 7
Draw the connection diagram of two shunt generators connected in parallel and discuss their load sharing. 7
7. Write technical notes on any two of the following: 2x7=14
Three winding transformer
Tap changing transformer
Three-phase to single-phase conversion
DIPLOMA IN ELECTRICAL ENGINEERING (DELVI) I ADVANCED LEVEL CERTIFICATE COURSE IN ELECTRICAL ENGINEERING (ACELVI)
h i "-s Term-End Examination
June, 2016
BIEE-027 ELECTRICAL MACHINES
Time: 2 hours Maximum Marks: 70
Note: Attempt any five questions. Use of scientific calculator is allowed. Missing data, if any, may be suitably assumed.
1. Why is the efficiency of a transformer high as compared to other rotating machines? Suggest methods to enhance efficiency of a transformer. 4
Explain heat-run test of a single-phase transformer in detail. 10
2. What is an Auto transformer? State its merits and.demerits over the two-winding transformer. 7
Explain speed-torque characteristics of DC series and shunt motor. 7
3. Describe the constructional details of a DC machine. 7
The induced e.m.f. in a DC machine, when running at 500 rpm is 180 V. Calculate the induced e.m.f while the machine is running at 600 rpm by assuming flux to be constant. 7
4. State the reasons for operating transformers in parallel. Describe the advantages of using several small transformers in parallel over the use of a single large transformer. 7
Explain the process of commutation in DC machine and describe the methods to improve it. 7
5. Explain the various methods of speed control of a DC motor with neat sketches. 14
6. Draw and explain the external characteristics of shunt, series and compound generators. 7
Draw the connection diagram of two shunt generators connected in parallel and discuss their load sharing. 7
7. Write technical notes on any two of the following: 2x7=14
Three winding transformer
Tap changing transformer
Three-phase to single-phase conversion
Other Question Papers
Departments
- Centre for Corporate Education, Training & Consultancy (CCETC)
- Centre for Corporate Education, Training & Consultancy (CCETC)
- National Centre for Disability Studies (NCDS)
- School of Agriculture (SOA)
- School of Computer and Information Sciences (SOCIS)
- School of Continuing Education (SOCE)
- School of Education (SOE)
- School of Engineering & Technology (SOET)
- School of Extension and Development Studies (SOEDS)
- School of Foreign Languages (SOFL)
- School of Gender Development Studies(SOGDS)
- School of Health Science (SOHS)
- School of Humanities (SOH)
- School of Interdisciplinary and Trans-Disciplinary Studies (SOITDS)
- School of Journalism and New Media Studies (SOJNMS)
- School of Law (SOL)
- School of Management Studies (SOMS)
- School of Performing Arts and Visual Arts (SOPVA)
- School of Performing Arts and Visual Arts(SOPVA)
- School of Sciences (SOS)
- School of Social Sciences (SOSS)
- School of Social Work (SOSW)
- School of Tourism & Hospitality Service Sectoral SOMS (SOTHSM)
- School of Tourism &Hospitality Service Sectoral SOMS (SOTHSSM)
- School of Translation Studies and Training (SOTST)
- School of Vocational Education and Training (SOVET)
- Staff Training & Research in Distance Education (STRIDE)
Subjects
- Basics of Electrical Engineering
- C - Programming
- Computer Applications In P.S.
- Control Systems
- Digital Control System
- Digital Control System Design
- Dynamics System Simulation
- Electrical Circuit Theory
- Electrical Engineering Material
- Electrical Installation and System
- E l e c t r i c a l M a c h i n e T h e o r y I I
- Electrical Machines-I
- Electrical Measurements And Instruments
- Electrical Power Transmission and Distribution
- Energy Audit
- Flexible Ac Transmission System
- Industrial Drives and Controls
- Mechatronics
- Power Generation System
- Power Plant Economics And Centering
- Power System Reliability
- Principles of Computer Architecture
- Special Electrical Machines
- Switchgear And Protection
- Utilization Of Electrical Engineering