Exam Details
| Subject | power electronic control of dc drives | |
| Paper | ||
| Exam / Course | computer science and engineering | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | January, 2018 | |
| City, State | telangana, hyderabad |
Question Paper
Hall Ticket No:
Question Paper Code B3303
(AUTONOMOUS) M. Tech I Semester Regular/Supplementary Examinations, January 2018
(Regulations: VCE-R15) POWER ELECTRONIC CONTROL OF DC DRIVES
(Power Electronics and Electric Drives) Date: 02 January, 2018 FN
Time: 3 hours
Max Marks: 70
Answer any FIVE Questions
Each Question carries equal marks
1.
Explain in detail the operation of a single-phase full converter feeding a D.C separately motor with reference to voltage and current waveforms, assume motor current is continuous.
7M
The speed of a 20 HP, 200V, 1000 rpm motor is controlled by a single phase full converter. The armature circuit resistance is 0.25 ohms. Motor constant Kaf=0.03 N-m/A2 The supply voltage is 230V. Assuming continuous and ripple free motor current, determine motor torque, motor current and supply power factor for firing angle α=30 degrees and speed N=1000rpm.
7M
2.
Draw and explain the speed-torque characteristics at different firing angles for a 3-phase fully converter feeding a separately excited D.C motor.
7M
A 220V, 1440rpm, 120A separately excited DC motor with armature resistance of 0.7 ohms is fed from 3-phase fully controlled converter with an ac source line voltage 440V, 50 Hz supply. A star connected transformer is used to feed the armature so that motor terminal voltage equals rated voltage when converter firing angle is zero. Calculate the value of firing angle when motor is running at 1200 rpm at rated torque.
7M
3.
Analyze the effect of resistive load and inductive load connected to the three phase controlled bridge rectifier.
7M
Explain the principle of operation of a three phase naturally commutated bridge Inverter.
7M
4.
Give the steady state analysis of three phase converter control the DC motor drive.
14M
5.
What is meant by Sixth harmonic torque? Derive peak sixth harmonic torque and armature resistive loss expression under continuous current conduction mode.
14M
6.
Explain the principle of operation of the chopper for the first, second, third, fourth quadrant operations with all relevant diagrams.
14M
7.
Distinguish between speed and current closed loops fed to a dc motor drive.
7M
Explain the design aspects of a current controller associated with chopper fed DC drive.
7M
8.
Explain the dynamic simulation aspects of speed controlled DC motor drives.
7M
Discuss the operation of a speed feedback speed controller.
7M
Question Paper Code B3303
(AUTONOMOUS) M. Tech I Semester Regular/Supplementary Examinations, January 2018
(Regulations: VCE-R15) POWER ELECTRONIC CONTROL OF DC DRIVES
(Power Electronics and Electric Drives) Date: 02 January, 2018 FN
Time: 3 hours
Max Marks: 70
Answer any FIVE Questions
Each Question carries equal marks
1.
Explain in detail the operation of a single-phase full converter feeding a D.C separately motor with reference to voltage and current waveforms, assume motor current is continuous.
7M
The speed of a 20 HP, 200V, 1000 rpm motor is controlled by a single phase full converter. The armature circuit resistance is 0.25 ohms. Motor constant Kaf=0.03 N-m/A2 The supply voltage is 230V. Assuming continuous and ripple free motor current, determine motor torque, motor current and supply power factor for firing angle α=30 degrees and speed N=1000rpm.
7M
2.
Draw and explain the speed-torque characteristics at different firing angles for a 3-phase fully converter feeding a separately excited D.C motor.
7M
A 220V, 1440rpm, 120A separately excited DC motor with armature resistance of 0.7 ohms is fed from 3-phase fully controlled converter with an ac source line voltage 440V, 50 Hz supply. A star connected transformer is used to feed the armature so that motor terminal voltage equals rated voltage when converter firing angle is zero. Calculate the value of firing angle when motor is running at 1200 rpm at rated torque.
7M
3.
Analyze the effect of resistive load and inductive load connected to the three phase controlled bridge rectifier.
7M
Explain the principle of operation of a three phase naturally commutated bridge Inverter.
7M
4.
Give the steady state analysis of three phase converter control the DC motor drive.
14M
5.
What is meant by Sixth harmonic torque? Derive peak sixth harmonic torque and armature resistive loss expression under continuous current conduction mode.
14M
6.
Explain the principle of operation of the chopper for the first, second, third, fourth quadrant operations with all relevant diagrams.
14M
7.
Distinguish between speed and current closed loops fed to a dc motor drive.
7M
Explain the design aspects of a current controller associated with chopper fed DC drive.
7M
8.
Explain the dynamic simulation aspects of speed controlled DC motor drives.
7M
Discuss the operation of a speed feedback speed controller.
7M
Other Question Papers
Subjects
- advanced algorithms
- advanced algorithms laboratory
- advanced data communications
- advanced data structures
- advanced data structures laboratory audit course – i
- advanced mechanics of solids
- advanced mechanisms
- advanced operating systems
- advanced operating systems laboratory
- artificial intelligence and neural networks
- business analytics
- cloud computing
- cloud computing laboratory
- cmos vlsi design
- computer graphics
- computer organization and architecture
- computer vision and pattern recognition
- constitution of india
- cpld and fpga architectures and applications
- cryptography and computer security
- data warehousing and data mining
- datawarehousing and data mining
- design patterns
- digital image processing
- digital systems design
- disaster management
- distributed computing
- distributed databases
- distributed operating systems
- dsp processors and architectures
- embedded linux
- embedded real time operating systems
- embedded systems
- energy conversion systems
- english for research papers writing
- entrepreneurship development
- finite element methods
- fracture, fatigue and creep deformation
- human computer interaction
- image processing
- industrial safety
- information retrieval systems
- information security
- machine learning
- major project phase-i
- major project phase-ii
- microcontrollers for embedded system design
- mini project with seminar audit course – ii
- mobile computing
- mobile satellite communications
- national service scheme
- number theory and cryptography
- object oriented analysis and design
- operations research
- pedagogy studies
- personality development through life enlightenment skills
- power electronic control of dc drives
- power electronic converters-i
- power semi conductor devices
- principles of machine modeling analysis
- research methodology and intellectual property rights
- sanskrit for technical knowledge
- semantic web and social networks
- software engineering principles
- solar, energy and applications
- stress management by yoga
- system modeling and simulation
- value education
- waste to energy
- web security
- wireless and mobile computing