Visvesvaraya Technological University (VTU) 2007 B.E Electrical and Electronics Engineering 6th SEM .06/.07 ELECTRICAL DRAWING AND CAD - Question Paper
USN
Sixth Semester R.E. Degree Examination, Dec. 06 / Jan. 07 Electrical and Electronics Engineering Electrical Drawing and CAD
Time: 3 firs.] [Max. Marks:100
Note: 1. Answer any FOUR questions form PART A and ONE question from PART B.
1 a. Draw single line diagram to show the arrangement of all equipment in a thermal power plant. (08 Marks)
b. Draw a neat single line diagram using standard symbols for a 110 kV / 11 kV with following details:
i) 110 kV incoming lines - 2 numbers
ii) Line OCBs 110 kV - 2 numbers
iii) Transformers step down 110 kV /l 1 kV - 2 numbers
iv) L.T. OCBs for transformers - 2 numbers
v) Duplicate bus bars on H.T. and L.T. sides to be indicated
vi) Bus coupler on H.T. side only
vii) Feeders 11 kV at L.T. bus - 6 numbers
viii) L.T. circuit breakers for feeders - 6 numbers
ix) In appropriate positions indicate L.A. isolators PTs and CTs
x) Earthing switches at incoming lines - 2 numbers
xi) Wave traps at incoming lines - 2 numbers
xii) Coupling condenser [c.c] at incoming lines 2 numbers
xiii) Station supply transformers 11 kV / 415 V to be shown at LT side. (12 Marks)
2 Design and draw a duplex progressive, lap winding diagram of a DC generator with 32 conductors and 4 poles. Show direction of motion of armature direction of induced emf brush positions. Draw sequence diagram. (20 Marks)
3 Draw the developed winding diagram for an AC three phase rotating machine with following details:
Poles - 4
Slots - 36 each slot contain one coil side Lap winding Full pitched
Star connected, bring out the terminals as A B C and N. (20 Marks)
Contd.... 2
4 Draw the front elevation left half in section, sectional plan and end view of a transformer with the dimensions given below. Scale Z2 full size.
Single phase core type 15 kVA, 50 Hz distribution type transformer
Cross section of core = 63 mm X 91.6 mm
Window = 298.5 mm X 114.5 mm
Yoke height = 63.5 mm
LT windings section of conductor = 2.79 mm X 10.6 mm one coil per leg
HV windings, cross section of wire = 2.59 mm diameter
Air space around core = 1.66 mm
Insulation between core and LT = 1.6 mm
Insulation on HT = 3 mm
Insulation at the top and bottom of winding
Insulation between layer = 0.35 mm
Provide 10 mm bolt with sleeve at suitable spacing. (20 Marks)
5 Draw to suitable scale i) End view and ii) Longitudinal view. Both top half in section for a DC machine.
Yoke details: outer diameter - 49.6 cm inner diameter - 40 cm length diameter - 16 cm.
Details of a main pole: number - 4
width - 6.08 cm height - 12.8 cm air gap length - 1.6 mm Inter pole details: number - 4
width - 9.5 cm height - 11 cm
air gap - 2.5 mm (20 Marks)
6 A yoke of a squirrel cage induction motor is made of cast iron. The stator core is fixed to the yoke by dovetail joint between the rectangular type ventilating holes. The rotor is directly mounted over the shaft. There is rectangular type ventilating hole above the shaft in the rotor core in each quadrant. The shaft is supported by end shield bearing. With suitable proportional dimensions draw the top sectional end view of above assembly.
(20 Marks)
7 a. Explain different options available for drawing a line, b. Explain the following commands:
(05 Marks) (15 Marks) (05 Marks) (15 Marks)
i) Trim ii) Extend iii) Offset iv) Mirror v) Move.
8 a. Explain different options available for drawing a circle,
b. Explain the following commands:
i) Array ii) Rotate iii) Hatch iv) Fillet v) Pan.
k itit Veit
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| Earning: Approval pending. |
