Exam Details
| Subject | elements of electrical design | |
| Paper | ||
| Exam / Course | pddc | |
| Department | ||
| Organization | Gujarat Technological University | |
| Position | ||
| Exam Date | May, 2017 | |
| City, State | gujarat, ahmedabad |
Question Paper
1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER EXAMINATION SUMMER 2017
Subject Code: X50902 Date: 02/05/2017
Subject Name: Elements of Electrical Design
Time: 02.30PM to 05.00PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
Prepare winding layout for a three phase a.c. machine having 24 armature slots, 4 pole double layer lap winding.
07
With suitable diagram explain power and control circuit of star delta starter.
07
Q.2
What is Carter's coefficient? How does it help in estimation of mmf in case of a slotted armature? What are the expressions to be used for estimation?
07
Explain how resistor sections can be calculated for the starter of a d.c. shunt motor.
07
OR
Find resistance of each of the 6 sections of a starter for a 400 V DC series motor used for cranes. Motor resistance is 0.35 ohm, max permissible starting current is 105 amp. Assume magnetization curve to be a straight line passing through origin.
07
Q.3
Explain four basic equations used in the design of electromagnet.
07
Determine required MMF for air gap of a machine having core length =0.32m,including 4 ducts of 10 mm each, pole arc=0.19m, slot pitch =65.4 mm slot opening 5 mm air gap length 5 mm flux per pole 52 mwb, carter's coeff. Is 0.18 for opening/gap and it is 0.28 for opening/gap =2.
07
OR
Q.3
Explain the design procedure of flat faced armature type small circular magnet.
07
Define and explain following terms clearly:
Dummy coil
Back and front pitch
Single layer and double layer winding.
07
Q.4
Design a battery charging transformer of 200 VA 12 V rating supplied from 230 V single phase mains. Assume all required data necessary and mention your assumption clearly.
14
OR
Q.4
Explain how design procedure of a welding transformer is different from that of normal transformer.
07
What is electric load? Giving examples classify different types of load.
07
Q.5
What are types of electric wiring? Explain any two in detail.
07
Explain the design procedure of electrification of a small industrial shade having a load of about 80 kW and shade area of 1000 square meters.
07
OR
Q.5
Discuss the factors that should be considered while selecting the type of a wiring system.
07
Explain how a flood lighting scheme for a cricket stadium can be designed?
07
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER EXAMINATION SUMMER 2017
Subject Code: X50902 Date: 02/05/2017
Subject Name: Elements of Electrical Design
Time: 02.30PM to 05.00PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
Prepare winding layout for a three phase a.c. machine having 24 armature slots, 4 pole double layer lap winding.
07
With suitable diagram explain power and control circuit of star delta starter.
07
Q.2
What is Carter's coefficient? How does it help in estimation of mmf in case of a slotted armature? What are the expressions to be used for estimation?
07
Explain how resistor sections can be calculated for the starter of a d.c. shunt motor.
07
OR
Find resistance of each of the 6 sections of a starter for a 400 V DC series motor used for cranes. Motor resistance is 0.35 ohm, max permissible starting current is 105 amp. Assume magnetization curve to be a straight line passing through origin.
07
Q.3
Explain four basic equations used in the design of electromagnet.
07
Determine required MMF for air gap of a machine having core length =0.32m,including 4 ducts of 10 mm each, pole arc=0.19m, slot pitch =65.4 mm slot opening 5 mm air gap length 5 mm flux per pole 52 mwb, carter's coeff. Is 0.18 for opening/gap and it is 0.28 for opening/gap =2.
07
OR
Q.3
Explain the design procedure of flat faced armature type small circular magnet.
07
Define and explain following terms clearly:
Dummy coil
Back and front pitch
Single layer and double layer winding.
07
Q.4
Design a battery charging transformer of 200 VA 12 V rating supplied from 230 V single phase mains. Assume all required data necessary and mention your assumption clearly.
14
OR
Q.4
Explain how design procedure of a welding transformer is different from that of normal transformer.
07
What is electric load? Giving examples classify different types of load.
07
Q.5
What are types of electric wiring? Explain any two in detail.
07
Explain the design procedure of electrification of a small industrial shade having a load of about 80 kW and shade area of 1000 square meters.
07
OR
Q.5
Discuss the factors that should be considered while selecting the type of a wiring system.
07
Explain how a flood lighting scheme for a cricket stadium can be designed?
07
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