Exam Details
| Subject | Electrical Machine - I | |
| Paper | ||
| Exam / Course | B.Tech. VIEP- Electrical Engineering III (BTCSVI/BTECVI/BTELVI) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2016 | |
| City, State | new delhi, |
Question Paper
Explain the functions of the following parts of a D.C. machine:
Field poles
Yoke
Commutator
Commutating poles
Armature
Give the advantages and uses of lap and wave windings. In what type of D.C. machine is wave winding employed and why?
Explain with the help of neat sketches the phenomenon of commutation in D.C. machines.
State and discuss the methods adopted for minimising the sparking at the brushes in D.C. machines.
Derive the e.m.f. equation of a D.C. generator.
The terminal voltage of a separately excited D.C. generator with constant excitation is constant and is equal to 250 V. Determine the percentage reduction in speed when the load changes from 250 kW to 150 kW. The armature resistance is 0.012 ohm and total contact drop at the brushes 2 V. Neglect armature reaction.
Give reasons for the following:
A shunt motor runs at almost constant speed irrespective of load current.
A differential compound motor is rarely used.
Discuss the applications of shunt, series and compound D.C. motors.
With the help of transformer phasor diagram for leading p.f. load, explain its working.
A 22001220 50 Hz, 1-phase transformer has an exciting current of 0.6 A and a core loss of 361 watts, when its h.v. side is energised at rated voltage. Determine the magnetising component of the exciting current.
Outline the procedure for performing the short circuit test. What useful information is obtained from the short circuit test
What is an auto-transformer Write the advantages and disadvantages of an auto-transformer.
7. Write short notes on any two of the following:
Three-phase Transformer Connections
Comparison between Star and Delta Systems .
Starting of D.C. Motors
Field poles
Yoke
Commutator
Commutating poles
Armature
Give the advantages and uses of lap and wave windings. In what type of D.C. machine is wave winding employed and why?
Explain with the help of neat sketches the phenomenon of commutation in D.C. machines.
State and discuss the methods adopted for minimising the sparking at the brushes in D.C. machines.
Derive the e.m.f. equation of a D.C. generator.
The terminal voltage of a separately excited D.C. generator with constant excitation is constant and is equal to 250 V. Determine the percentage reduction in speed when the load changes from 250 kW to 150 kW. The armature resistance is 0.012 ohm and total contact drop at the brushes 2 V. Neglect armature reaction.
Give reasons for the following:
A shunt motor runs at almost constant speed irrespective of load current.
A differential compound motor is rarely used.
Discuss the applications of shunt, series and compound D.C. motors.
With the help of transformer phasor diagram for leading p.f. load, explain its working.
A 22001220 50 Hz, 1-phase transformer has an exciting current of 0.6 A and a core loss of 361 watts, when its h.v. side is energised at rated voltage. Determine the magnetising component of the exciting current.
Outline the procedure for performing the short circuit test. What useful information is obtained from the short circuit test
What is an auto-transformer Write the advantages and disadvantages of an auto-transformer.
7. Write short notes on any two of the following:
Three-phase Transformer Connections
Comparison between Star and Delta Systems .
Starting of D.C. Motors
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
- Active Filter Design
- Advanced Control System
- Advanced Power Electronics
- Applied Electromagnetics
- Basics Of Electrical Engineering
- Computer Process Control
- Control System
- Digital Electronics
- Electric Energy Utilization
- Electrical And Electronics Engineering Materials
- Electrical Instrumentation
- Electrical Machine - I
- Electrical Machines - Ii
- Electrical Machines And Electronics
- Electrical Measurements And Measuring Instruments
- Electro Mechanical Energy Conversion - I
- Electro-Mechanical Energy Conversion - Ii
- Electro-Mechanical Energy Conversion-Iii
- Electromagnetic Theory
- Energy Auditing And Analysis
- High Voltage Engineering
- Industrial Drives
- Micro Controllers
- Microprocessor And Applications
- Network Theory
- Power Quality Issues And Remedial Measures
- Power System
- Power System - I
- Stochastic Control Systems
- Switchgear And Protection