Exam Details
| Subject | power system practice and design | |
| Paper | ||
| Exam / Course | pddc | |
| Department | ||
| Organization | Gujarat Technological University | |
| Position | ||
| Exam Date | November, 2018 | |
| City, State | gujarat, ahmedabad |
Question Paper
1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-VI EXAMINATION WINTER 2018
Subject Code:X60904 Date: 30/11/2018
Subject Name: Power System Practice and Design
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
Explain the factors while considering voltage, and spacing of conductors for transmission line design.
07
What are corona losses? Explain the empirical formula for determination of corona losses.
07
Q.2
Discuss the following factors to be taken into consideration while mechanical design of transmission line. Span Sag Tension
07
What are the specifications of transmission line?
07
OR
Explain the surge impedance loading of transmission line.
07
Q.3
Write a short note on Bundled conductors.
07
What are the design considerations for EHV transmission line?
07
OR
Q.3
Discuss Kelvin's law to find the most economical conductor size. What are the
Limitations of this law?
07
Explain the Radial and loop distribution system with figures.
07
Q.4
The cost of two core feeder cable, including installation is (90a 10) per metre and interest and depreciation charges are 15%. The cable 1 km in length and cost of energy is 3 paisa per unit. Maximum current in the feeder is 260 A and demand is such that copper loss is equivalent to that would be produced by full current flowing for 6 months. If resistance of conductor of 1 sq.cm. and 1 km length is 0.173 Ω. Calculate most economical cross section area.
07
Write short notes on Lamp Flicker.
07
OR
Q.4
A single phase a.c. distributor AB 300 metres long is fed from end A and is
loaded as under
100 A at 0·707 p.f. lagging 200 m from point A
200 A at 0·8 p.f. lagging 300 m from point A
The load resistance and reactance of the distributor is 0·2 Ω and 0·1 Ω per
kilometer. Calculate the total voltage drop in the distributor. The load power
factors refer to the voltage at the far end.
07
Compare Radial, Ring and grid distribution system.
07
Q.5
Explain the method of measurement of earth resistance.
07
Draw the schematic of an HVDC system and hence explain its principle of
Operation. Discuss various types of HVDC links used.
07
OR
Q.5
Explain different types of substation and equipment used in substation.
07
Explain any three applications of HVDC system.
07
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-VI EXAMINATION WINTER 2018
Subject Code:X60904 Date: 30/11/2018
Subject Name: Power System Practice and Design
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
Explain the factors while considering voltage, and spacing of conductors for transmission line design.
07
What are corona losses? Explain the empirical formula for determination of corona losses.
07
Q.2
Discuss the following factors to be taken into consideration while mechanical design of transmission line. Span Sag Tension
07
What are the specifications of transmission line?
07
OR
Explain the surge impedance loading of transmission line.
07
Q.3
Write a short note on Bundled conductors.
07
What are the design considerations for EHV transmission line?
07
OR
Q.3
Discuss Kelvin's law to find the most economical conductor size. What are the
Limitations of this law?
07
Explain the Radial and loop distribution system with figures.
07
Q.4
The cost of two core feeder cable, including installation is (90a 10) per metre and interest and depreciation charges are 15%. The cable 1 km in length and cost of energy is 3 paisa per unit. Maximum current in the feeder is 260 A and demand is such that copper loss is equivalent to that would be produced by full current flowing for 6 months. If resistance of conductor of 1 sq.cm. and 1 km length is 0.173 Ω. Calculate most economical cross section area.
07
Write short notes on Lamp Flicker.
07
OR
Q.4
A single phase a.c. distributor AB 300 metres long is fed from end A and is
loaded as under
100 A at 0·707 p.f. lagging 200 m from point A
200 A at 0·8 p.f. lagging 300 m from point A
The load resistance and reactance of the distributor is 0·2 Ω and 0·1 Ω per
kilometer. Calculate the total voltage drop in the distributor. The load power
factors refer to the voltage at the far end.
07
Compare Radial, Ring and grid distribution system.
07
Q.5
Explain the method of measurement of earth resistance.
07
Draw the schematic of an HVDC system and hence explain its principle of
Operation. Discuss various types of HVDC links used.
07
OR
Q.5
Explain different types of substation and equipment used in substation.
07
Explain any three applications of HVDC system.
07
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