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 | December, 2016 | |
| City, State | new delhi, |
Question Paper
1. What is meant by 'armature reaction' Discuss the methods to improve commutation process in a d.c. machine in detail.
The field and armature resistances of a 220 V d.c. shunt machine are 88ohms and 0·05 ohms, respectively. Calculate the total armature power developed when working
as a generator delivering power of 22 kW, and
as a motor taking 22 kW power input.
Discuss the conditions to be fulfilled for parallel operation of two or more d.c. shunt generators.
What are the functions of a starter? Why are small motors connected directly to the supply lines without starters?
Explain Swinburne's Test with neat schematic diagram.
4. Explain the principle of operation of a single·phase transformer and also derive the e.m.f. equation of it.
What are the various losses in a transformer Derive the condition for maximum efficiency.
5. A 10 kVA, 500/250 50 Hz, single-phase transformer has the following test results
OC:500 1·2A; 80W
SC: 50 15 90W
Determine the regulation and efficiency of the transformer at full load and 0·8 power factor lagging.
What do you understand by 'Autotransformer' Discuss the advantages, disadvantages and applications of an autotransformer.
Discuss in detail, the methods for connection of a three-phase transformer.
7. Write technical notes on any two of the following:
Speed Control of DC-Motor
Tap Changing Transformer
Characteristics of DC Shunt and Series Generators
The field and armature resistances of a 220 V d.c. shunt machine are 88ohms and 0·05 ohms, respectively. Calculate the total armature power developed when working
as a generator delivering power of 22 kW, and
as a motor taking 22 kW power input.
Discuss the conditions to be fulfilled for parallel operation of two or more d.c. shunt generators.
What are the functions of a starter? Why are small motors connected directly to the supply lines without starters?
Explain Swinburne's Test with neat schematic diagram.
4. Explain the principle of operation of a single·phase transformer and also derive the e.m.f. equation of it.
What are the various losses in a transformer Derive the condition for maximum efficiency.
5. A 10 kVA, 500/250 50 Hz, single-phase transformer has the following test results
OC:500 1·2A; 80W
SC: 50 15 90W
Determine the regulation and efficiency of the transformer at full load and 0·8 power factor lagging.
What do you understand by 'Autotransformer' Discuss the advantages, disadvantages and applications of an autotransformer.
Discuss in detail, the methods for connection of a three-phase transformer.
7. Write technical notes on any two of the following:
Speed Control of DC-Motor
Tap Changing Transformer
Characteristics of DC Shunt and Series Generators
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)
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- 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