Exam Details
| Subject | elements of electrical 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-V EXAMINATION WINTER 2018
Subject Code:X50902 Date: 16/11/2018
Subject Name: Elements of Electrical Design
Time: 10:30 AM TO 01:00 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
Derive the necessary equations of MMF for air gap for slotted armature.
07
Explain the star/delta starter for induction motor with necessary power and control circuit.
07
Q.2
List out the different types of electro magnet and give the applications of each.
07
Determine the air gap length of a d.c. machine from the following data:
Gross Core length: 0.10 Number of ducts=01, width of duct 10 mm
Slot pitch=24 mm, Slot width=12 mm, Carter's coefficient for slots and ducts=0.3, Gap flux density at pole centre=0.65T, field MMF per pole=3800A,
MMF required for iron parts of magnetic circuit=600A
07
OR
Design a suitable 8 section starter for a 14.92 kW, 250 1000 rpm d.c.shunt motor from the following data: Maximum starting torque=Full load Torque Armature Circuit Resistance: 0.4 Ω Full load efficiency =0.85
07
Q.3
Calculate the front pitch, back pitch and winding pitch for a simplex lap wound 18 slots,6-pole d.c.armature.
07
Classify various types of d.c. armature winding.
07
OR
Q.3
List out the different types of wires used for domestic wiring.
07
What are the important factors on which the conductor size calculations are carried out?
07
Q.4
Explain the steps for design the core of small single phase transformer.
07
Explain the steps for designing 1-phase choke coil.
07
OR
Q.4
Design electrical wiring of residential, considering 4 fan of 100 watt each, 6 light points of 40 watt each, 3 plugs of 5 amp and 2 plugs of 15 amp each. Assume suitable data, if necessary. Calculate the total electrical loads, number of circuits and suitable size of wires. Draw electrical wiring diagram.
07
Explain the service connections.
07
Q.5
Explain the steps for designing welding transformer.
07
Derive the necessary equations for grading of starting resistance of d.c. shunt motor starter.
07
OR
Q.5
Explain the steps for designing the Horse Shoe type electromagnet.
07
Derive the necessary equation of real and apparent flux density in teeth.
07
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-V EXAMINATION WINTER 2018
Subject Code:X50902 Date: 16/11/2018
Subject Name: Elements of Electrical Design
Time: 10:30 AM TO 01:00 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
Derive the necessary equations of MMF for air gap for slotted armature.
07
Explain the star/delta starter for induction motor with necessary power and control circuit.
07
Q.2
List out the different types of electro magnet and give the applications of each.
07
Determine the air gap length of a d.c. machine from the following data:
Gross Core length: 0.10 Number of ducts=01, width of duct 10 mm
Slot pitch=24 mm, Slot width=12 mm, Carter's coefficient for slots and ducts=0.3, Gap flux density at pole centre=0.65T, field MMF per pole=3800A,
MMF required for iron parts of magnetic circuit=600A
07
OR
Design a suitable 8 section starter for a 14.92 kW, 250 1000 rpm d.c.shunt motor from the following data: Maximum starting torque=Full load Torque Armature Circuit Resistance: 0.4 Ω Full load efficiency =0.85
07
Q.3
Calculate the front pitch, back pitch and winding pitch for a simplex lap wound 18 slots,6-pole d.c.armature.
07
Classify various types of d.c. armature winding.
07
OR
Q.3
List out the different types of wires used for domestic wiring.
07
What are the important factors on which the conductor size calculations are carried out?
07
Q.4
Explain the steps for design the core of small single phase transformer.
07
Explain the steps for designing 1-phase choke coil.
07
OR
Q.4
Design electrical wiring of residential, considering 4 fan of 100 watt each, 6 light points of 40 watt each, 3 plugs of 5 amp and 2 plugs of 15 amp each. Assume suitable data, if necessary. Calculate the total electrical loads, number of circuits and suitable size of wires. Draw electrical wiring diagram.
07
Explain the service connections.
07
Q.5
Explain the steps for designing welding transformer.
07
Derive the necessary equations for grading of starting resistance of d.c. shunt motor starter.
07
OR
Q.5
Explain the steps for designing the Horse Shoe type electromagnet.
07
Derive the necessary equation of real and apparent flux density in teeth.
07
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