Exam Details
| Subject | 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 | |
| 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, 2015 | |
| City, State | new delhi, |
Question Paper
1. Write short notes on any two of the following: Universal Motor Slip ring 3-phase Induction Motor Synchronous Condenser
2.(a) Explain Brushless Excitation system for synchronous motor.
(b) Discuss the power-angle characteristics of salient pole synchronous machines.
3.(a) Explain the phenomenon of rotor hunting in a synchronous motor. Illustrate, using relevant phasor diagram.
(b) A 40 kVA, 400 V-connected synchronous machine has short-circuit load loss of 1.5 kW at rated armature current at 30°C. At this temperature, the dc resistance of the armature is 0·118 ohm per phase. Determine the ratio of ac to dc resistance.
4.(a) Derive the expressions for air gap power and electromagnetic torque developed from the equivalent circuit of an induction motor. An induction motor has an efficiency of when the load is 45 kW. At this load, stator copper loss and rotor copper loss each is equal to the iron loss. The mechanical loss is one-third of the no load losses. Neglect copper loss at no load. Determine the slip.
5.(a) Explain Torque-Slip characteristics of 3-phase Induction Motor.
(b) Derive the expression for induction motor electromagnetic torque in terms of maximum electromagnetic torque.
6.(a) Explain that a single-phase induction motor is not a self-starting machine, with the help of double revolving field theory. Explain the working principle of 1-phase capacitor start capacitor run induction motor. Draw a neat connection diagram and torque-speed characteristic.
7.(a) Discuss the working principle of Linear Induction motor.
Explain Star-Delta starter for 3-phase induction motors.
2.(a) Explain Brushless Excitation system for synchronous motor.
(b) Discuss the power-angle characteristics of salient pole synchronous machines.
3.(a) Explain the phenomenon of rotor hunting in a synchronous motor. Illustrate, using relevant phasor diagram.
(b) A 40 kVA, 400 V-connected synchronous machine has short-circuit load loss of 1.5 kW at rated armature current at 30°C. At this temperature, the dc resistance of the armature is 0·118 ohm per phase. Determine the ratio of ac to dc resistance.
4.(a) Derive the expressions for air gap power and electromagnetic torque developed from the equivalent circuit of an induction motor. An induction motor has an efficiency of when the load is 45 kW. At this load, stator copper loss and rotor copper loss each is equal to the iron loss. The mechanical loss is one-third of the no load losses. Neglect copper loss at no load. Determine the slip.
5.(a) Explain Torque-Slip characteristics of 3-phase Induction Motor.
(b) Derive the expression for induction motor electromagnetic torque in terms of maximum electromagnetic torque.
6.(a) Explain that a single-phase induction motor is not a self-starting machine, with the help of double revolving field theory. Explain the working principle of 1-phase capacitor start capacitor run induction motor. Draw a neat connection diagram and torque-speed characteristic.
7.(a) Discuss the working principle of Linear Induction motor.
Explain Star-Delta starter for 3-phase induction 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
- 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