Exam Details
| Subject | Industrial Drives and Controls | |
| 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
State or 'False'.
A chopper is a d.c. -d.c. converter.
DC motors cannot be controlled by chopper.
A semi-converter operates in two quadrants.
The use of freewheeling diode improves the wave-shapes of load current.
In a 3-phase fully controlled
converter, six pulses of output in one cycle of input can be observed.
All inverters use forced commutation.
The output voltage of a cycloconverter cannot be changed.
(viii) A cycloconverter is a group of controlled rectifiers.
Fill in the blanks.
motor cannot be operated without load.
have six pulses in the output for one cycle of input.
Electric drives is the circuit which controls the of the motor.
Explain the operation of a single phase full converter fed d.c. drive along with proper waveforms.
Full converters are better choice as compared to semi-converters for d.c. motor drives. Comment on the statement.
Derive the expressions for the average value of output voltage and current for a 3-phase full converter.
A 220 1500 rpm, 50 A separately excited motor with an armature resistance of 0·5 0 is fed from a 3-phase full converter with an a.c. source having line voltage 440 50 Hz. Determine the value of firing angle when the motor is running at 1200 rpm and rated torque. Rated terminal voltage is obtained at a
Describe the working of a chopper-controlled separately excited d.c. motor and derive the expression of armature current.
Explain the four quadrant operation of a d.c. drive.
What are the basic components of electric drives?
Enumerate the merits and demerits of a.c. drives and d.c. drives.
Explain the variable frequency control of an induction motor by VSI.
Explain the speed -torque characteristics of induction motors.
Describe the working of closed-loop control of a chopper fed d.c. drive. Explain with a block diagram.
A 230 960 rpm, 200 A separately excited d.c. motor has an armature resistance of 0·02 ohm and source voltage of 230 V. Calculate the duty ratio of chopper at rated torque and 350 rpm. Assume continuous conduction.
8. Write short notes on any four of the following:
Current Source Inverter
Cycloconverters
Closed-loop operation of induction motor drives
Continuous current operation
Speed and torque equations of d.c. motor
PWM Control
A chopper is a d.c. -d.c. converter.
DC motors cannot be controlled by chopper.
A semi-converter operates in two quadrants.
The use of freewheeling diode improves the wave-shapes of load current.
In a 3-phase fully controlled
converter, six pulses of output in one cycle of input can be observed.
All inverters use forced commutation.
The output voltage of a cycloconverter cannot be changed.
(viii) A cycloconverter is a group of controlled rectifiers.
Fill in the blanks.
motor cannot be operated without load.
have six pulses in the output for one cycle of input.
Electric drives is the circuit which controls the of the motor.
Explain the operation of a single phase full converter fed d.c. drive along with proper waveforms.
Full converters are better choice as compared to semi-converters for d.c. motor drives. Comment on the statement.
Derive the expressions for the average value of output voltage and current for a 3-phase full converter.
A 220 1500 rpm, 50 A separately excited motor with an armature resistance of 0·5 0 is fed from a 3-phase full converter with an a.c. source having line voltage 440 50 Hz. Determine the value of firing angle when the motor is running at 1200 rpm and rated torque. Rated terminal voltage is obtained at a
Describe the working of a chopper-controlled separately excited d.c. motor and derive the expression of armature current.
Explain the four quadrant operation of a d.c. drive.
What are the basic components of electric drives?
Enumerate the merits and demerits of a.c. drives and d.c. drives.
Explain the variable frequency control of an induction motor by VSI.
Explain the speed -torque characteristics of induction motors.
Describe the working of closed-loop control of a chopper fed d.c. drive. Explain with a block diagram.
A 230 960 rpm, 200 A separately excited d.c. motor has an armature resistance of 0·02 ohm and source voltage of 230 V. Calculate the duty ratio of chopper at rated torque and 350 rpm. Assume continuous conduction.
8. Write short notes on any four of the following:
Current Source Inverter
Cycloconverters
Closed-loop operation of induction motor drives
Continuous current operation
Speed and torque equations of d.c. motor
PWM Control
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)
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- School of Performing Arts and Visual Arts(SOPVA)
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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