Exam Details
| Subject | Electro-Mechanical Energy Conversion - Ii | |
| 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
No. of Printed Pages: 3 I BIEE-012I
B.Tech. -VIEP -ELECTRICAL ENGINEERING
(BTELVI)
Term-End Examination
December, 2016
00813
BIEE-012 ELECTRO-MECHANICAL ENERGY CONVERSION -II
Time hours Maximum Marks: 70
Note:
Attempt any five questions.
All questions carry equal marks.
Assume the missing data suitably (if any).
Use of scientific calculator is allowed.
1. Derive the e.m.f. equation of an alternator. 7
With the help of neat sketches, discuss the significance of pitch factor and distribution factor. 7
2. Derive the expression for power developed by a salient pole synchronous motor. 7
Discuss the effect of load on synchronous motor. 7
3. Discuss the no load and blocked rotor test on a 3-phase induction motor. 7
A 6-pole, 50 Hz, 3-phase induction motor running on full load develops a useful torque of 150 N-m at a rotor frequency of 1.5 Hz. Calculate· the shaft power output, if the mechanical torque lost in friction be 10 N-m. Also, determine
the rotor copper loss,
the input to the motor, and
the efficiency.
The total stator loss is 700 W. 7
4. Draw the torque-slip characteristics of a 3-phase induction motor at fixed terminal voltage. Also explain the various associated torques. 7
A 6-pole, 50 Hz slip ring induction motor has a rotor resistance of 0.25 Q and a maximum torque of 180 while it runs at 860 rpm. Calculate 7
the torque at 4.5% slip, and
the resistance to be added in the rotor circuit to obtain the maximum torque at starting.
5. What are the various starting methods of 1-phase induction motor Explain anyone method in detail. 7
With the help of a neat diagram, explain the working principle of universal motor. 7
6. What are the various causes of hunting in synchronous motors? How will it-affect the operation of synchronous motors? 7
A 220 single phase induction motor gave the following test results
Blocked rotor test 120 9.6 460 W
No-load test: 220 4.6 125 W
The stator winding resistance is 1.5 Q and during the blocked rotor test, the starting winding is open. Determine the equivalent circuit parameters. Also find the core, friction and windage loss. 7
7. Write short notes on any two of the following: 2x7=14
Stepper motor
V-curves of synchronous motor
Power flow equations of Cylindrical and Salient pole machines
B.Tech. -VIEP -ELECTRICAL ENGINEERING
(BTELVI)
Term-End Examination
December, 2016
00813
BIEE-012 ELECTRO-MECHANICAL ENERGY CONVERSION -II
Time hours Maximum Marks: 70
Note:
Attempt any five questions.
All questions carry equal marks.
Assume the missing data suitably (if any).
Use of scientific calculator is allowed.
1. Derive the e.m.f. equation of an alternator. 7
With the help of neat sketches, discuss the significance of pitch factor and distribution factor. 7
2. Derive the expression for power developed by a salient pole synchronous motor. 7
Discuss the effect of load on synchronous motor. 7
3. Discuss the no load and blocked rotor test on a 3-phase induction motor. 7
A 6-pole, 50 Hz, 3-phase induction motor running on full load develops a useful torque of 150 N-m at a rotor frequency of 1.5 Hz. Calculate· the shaft power output, if the mechanical torque lost in friction be 10 N-m. Also, determine
the rotor copper loss,
the input to the motor, and
the efficiency.
The total stator loss is 700 W. 7
4. Draw the torque-slip characteristics of a 3-phase induction motor at fixed terminal voltage. Also explain the various associated torques. 7
A 6-pole, 50 Hz slip ring induction motor has a rotor resistance of 0.25 Q and a maximum torque of 180 while it runs at 860 rpm. Calculate 7
the torque at 4.5% slip, and
the resistance to be added in the rotor circuit to obtain the maximum torque at starting.
5. What are the various starting methods of 1-phase induction motor Explain anyone method in detail. 7
With the help of a neat diagram, explain the working principle of universal motor. 7
6. What are the various causes of hunting in synchronous motors? How will it-affect the operation of synchronous motors? 7
A 220 single phase induction motor gave the following test results
Blocked rotor test 120 9.6 460 W
No-load test: 220 4.6 125 W
The stator winding resistance is 1.5 Q and during the blocked rotor test, the starting winding is open. Determine the equivalent circuit parameters. Also find the core, friction and windage loss. 7
7. Write short notes on any two of the following: 2x7=14
Stepper motor
V-curves of synchronous motor
Power flow equations of Cylindrical and Salient pole machines
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- Active Filter Design
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- Basics Of Electrical Engineering
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- 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
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- Network Theory
- Power Quality Issues And Remedial Measures
- Power System
- Power System - I
- Stochastic Control Systems
- Switchgear And Protection