Exam Details
| Subject | Switchgear And Protection | |
| 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, 2016 | |
| City, State | new delhi, |
Question Paper
No. of Printed Pages: 4
il BIE.-OOOI
DIPLOMA IN ELECTRICAL ENGINEERING
(DELVI)
Term-End.Examination
December, 2016
0099...:5
BIEEE-006 SWITCHGEAR AND PROTECTION
Time 2 hours Maximum Marks: 70
Note: Question no. 1 ,is. compulsory. Answer any four. questions from questions no. 2 to 7. Use of scientific calculator is allowed.
1. Fill in the blanks with the most suitable option. 7x2=14
Earth relays have current settings.
low
high
very high
An effective protective relaying should have
reliability
selectivity
Both and
Electromagnetic relays are
induction type
rectifier type
Either or
For transmission line protection relays are the most suitable.
under voltage
distance
earth fault
is used to lower down the magnitude of current.
CT
PT
Relay
A phase comparator compares the of two input quantities.
magnitude
phase angle
Both and
SF6 is used in circuit-breakers for
cooling
heating
arc quenching
2. Define the following properties of a relay: 4x3 1/2 =14
Selectivity
Sensitivity
Reliability
Speed
3. What are the different types of electromagnetic relays? Explain the construction and working of induction relay and derive its torque equation. 14
4. Explain impedance relay in detail. 7
Draw and explain the operating characteristic of a reactance relay on R-X diagram. 7
5. A 3-phase, 20 MVA, star-connected generator is protected by the current balance system of protection. If the ratio of CTs is 1200/5, the minimum. operating current of relay is 0.75 A and the neutral resistance is 6 calculate the percentage of.each phase of stator winding which is unprotected against earth faults when the machine is operating at normal voltage. 14
6. Describe the carrier current protection scheme of transmission lines. 7
Discuss the circulating current scheme for bus bar protection. 7
7. Explain the construction and working of SF6 circuit-breaker. 7
What are the different tests conducted on circuit-breakers? Explain in detail. 7
il BIE.-OOOI
DIPLOMA IN ELECTRICAL ENGINEERING
(DELVI)
Term-End.Examination
December, 2016
0099...:5
BIEEE-006 SWITCHGEAR AND PROTECTION
Time 2 hours Maximum Marks: 70
Note: Question no. 1 ,is. compulsory. Answer any four. questions from questions no. 2 to 7. Use of scientific calculator is allowed.
1. Fill in the blanks with the most suitable option. 7x2=14
Earth relays have current settings.
low
high
very high
An effective protective relaying should have
reliability
selectivity
Both and
Electromagnetic relays are
induction type
rectifier type
Either or
For transmission line protection relays are the most suitable.
under voltage
distance
earth fault
is used to lower down the magnitude of current.
CT
PT
Relay
A phase comparator compares the of two input quantities.
magnitude
phase angle
Both and
SF6 is used in circuit-breakers for
cooling
heating
arc quenching
2. Define the following properties of a relay: 4x3 1/2 =14
Selectivity
Sensitivity
Reliability
Speed
3. What are the different types of electromagnetic relays? Explain the construction and working of induction relay and derive its torque equation. 14
4. Explain impedance relay in detail. 7
Draw and explain the operating characteristic of a reactance relay on R-X diagram. 7
5. A 3-phase, 20 MVA, star-connected generator is protected by the current balance system of protection. If the ratio of CTs is 1200/5, the minimum. operating current of relay is 0.75 A and the neutral resistance is 6 calculate the percentage of.each phase of stator winding which is unprotected against earth faults when the machine is operating at normal voltage. 14
6. Describe the carrier current protection scheme of transmission lines. 7
Discuss the circulating current scheme for bus bar protection. 7
7. Explain the construction and working of SF6 circuit-breaker. 7
What are the different tests conducted on circuit-breakers? Explain in detail. 7
Other Question Papers
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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