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7.
In an orthogonal machining operation:
Uncut thickness = 0.5 mm
Cutting speed = 20 m/min
Width of cut = 5 mm
Chip thickness = 0.7 mm
Thrust force = 200 N
Cutting force = 1200 N
Rake angle = 15°
Assume Merchant’s theory.
[1] The values of shear angle and shear strain, respectively, are [2 marks]
(A) 30.3° and 1.98
(B) 30.3° and 4.23
(C) 40.2° and 2.97
(D) 40.2° and 1.65[2] The coefficient of friction at the tool-chip interface is: [2 marks]
(A) 0.23
(B) 0.46
(C) 0.85
(D) 0.95
[3] The percentage of total energy dissipated due to friction at the tool-chip interface is:
[2 marks]
(A) 30%
(B) 42%
(C) 58%
(D) 70%asked in Mechanical Engineering, 2006
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8.
The table gives details of an assembly line.
Work station I II III IV V VI Total task time at the workstation (in minutes) 7 9 7 10 9 6
(A) 70%
(B) 75%
(C) 80%
(D) 85%
asked in Mechanical Engineering, 2006
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9.
A stockist wishes to optimize the number of perishable items he needs to stock in any month in his store. The demand distribution for this perishable item is:
Demand (in units) 2 3 4 5 Probability 0.10 0.35 0.35 0.20
[2 marks]
(A) 5 units
(B) 4 units
(C) 3 units
(D) 2 units
asked in Mechanical Engineering, 2006
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10.
A firm is required to procure three items (P, Q and R). The prices quoted for these items (in Rs.) by suppliers S1, S2 and S3 are given in table. The management policy requires that each item has to be supplied by only one supplier and one supplier supply only one item. The minimum total cost (in Rs.) of procurement to the firm is:
S1 S2 S3 P 110 120 130 Q 115 140 140 R 125 145 165
(A) 350
(B) 360
(C) 385
(D) 395
asked in Mechanical Engineering, 2006
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11.
Consider the following data for an item.
Price quoted by a supplierOrder quantity (units) Unit price (Rs.) < 500 10 ≥ 500 9
Ordering cost: Rs.100 per order
Inventory holding rate: 25% of unit price.
The optimum order quantity (in units) is: [2 marks]
(A) 447
(B) 471
(C) 500
(D) ≥ 600
asked in Mechanical Engineering, 2006
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12.