Exam Details
| Subject | Electro Mechanical Energy Conversion - 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 | June, 2016 | |
| City, State | new delhi, |
Question Paper
1. Write short notes on any two of the following:
Autotransformer
Open Delta Connection
Three Point Starter
Discuss the mechanical work done by differential movement of armature limb in case of a relay.
Explain the construction of a reluctance motor. Explain its working principle also.
Explain the no-load phasor diagram of a transformer.
Explain how no-load parameters are estimated in a transformer by open circuit test.
Discuss four conditions for the parallel operation of a transformer.
With the help of a phasor diagram of parallel operation of transformers under no-load condition, discuss the effect of core loss component of current.
Explain commutation in a d.c. machine.
Derive the expression for torque in a d.c. machine.
Discuss net reduction in the main field flux per pole due to armature reaction.
Explain the effect of cross-magnetizing armature reaction on iron losses.
Draw a schematic diagram of a d.c. compound machine fitted with interpole and compensating windings.
A commutator with a diameter of 50 cm rotates at 1000 rpm. For a brush width of 1·5 cm, find the time of commutation.
Draw the circuit diagram of a compound generator with diverter. Explain the use of diverter in d.c. compound generators.
A 15 kW, 230 80 1000 rpm d.c. series motor has the following full load losses expressed in percentage of motor input:
Armature circuit ohmic loss (including brush loss) 2·8%
Field ohmic loss 2.6%
Rotational loss 2·2%
If the motor draws half the rated current at rated voltage, determine the speed in rpm.
Make necessary assumptions.
Discuss series-parallel field control for a d.c. series motor.
Discuss Hopkinson's method on two d.c. shunt machines.
10.(a) Explain the condition for zero voltage regulation of a transformer.
Derive the condition for maximum efficiency of a transformer.
Autotransformer
Open Delta Connection
Three Point Starter
Discuss the mechanical work done by differential movement of armature limb in case of a relay.
Explain the construction of a reluctance motor. Explain its working principle also.
Explain the no-load phasor diagram of a transformer.
Explain how no-load parameters are estimated in a transformer by open circuit test.
Discuss four conditions for the parallel operation of a transformer.
With the help of a phasor diagram of parallel operation of transformers under no-load condition, discuss the effect of core loss component of current.
Explain commutation in a d.c. machine.
Derive the expression for torque in a d.c. machine.
Discuss net reduction in the main field flux per pole due to armature reaction.
Explain the effect of cross-magnetizing armature reaction on iron losses.
Draw a schematic diagram of a d.c. compound machine fitted with interpole and compensating windings.
A commutator with a diameter of 50 cm rotates at 1000 rpm. For a brush width of 1·5 cm, find the time of commutation.
Draw the circuit diagram of a compound generator with diverter. Explain the use of diverter in d.c. compound generators.
A 15 kW, 230 80 1000 rpm d.c. series motor has the following full load losses expressed in percentage of motor input:
Armature circuit ohmic loss (including brush loss) 2·8%
Field ohmic loss 2.6%
Rotational loss 2·2%
If the motor draws half the rated current at rated voltage, determine the speed in rpm.
Make necessary assumptions.
Discuss series-parallel field control for a d.c. series motor.
Discuss Hopkinson's method on two d.c. shunt machines.
10.(a) Explain the condition for zero voltage regulation of a transformer.
Derive the condition for maximum efficiency of a transformer.
Other Question Papers
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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