ISRO Mechanical Engg.: Manufacturing Quiz 3

Attempt now to get your rank among 1969 students!

Question 1

A hole is specified as Ф50^{(+0.050/-0.00)} mm. The mating shaft has a clearance fit with minimum clearance of 0.02 mm. The tolerance on the shaft is 0.03 mm. Maximum clearance between hole and shaft is

• A0.100 mm
• B0.030 mm
• C0.080 mm
• D0.070 mm

Question 2

A titanium sheet of 5.0 mm thickness is cut by wire-cut EDM process using a wire of 1.0 mm diameter. A uniform spark gap of 0.5 mm on both sides of the wire is maintained during cutting operation. If the feed rate of wire into the sheet is 20 mm/min, the material removing rate (in /min) will be

• A150
• B200
• C300
• D400

Question 3

Shrinkage allowance is made by

• AAdding to external and internal dimensions
• BSubtracting from external and internal dimensions
• CSubtracting from external dimensions and adding to internal dimensions
• DAdding to external dimensions and subtracting from internal dimensions

Question 4

With a punch for which the maximum crushing stress is four times the maximum shearing stress of the plate, the biggest hole that can be punched in the plate would be of diameter equal to ____________.

• Aone foutrth of thickness of plate
• Bhalf of thickness of plate
• Cplate thickness
• D2 Plate thickness

Question 5

A milling machine has the following two index plates supplied along with the indexing head:
Plate 1 : 15, 16,17, 18, 19, 20, hole circles
Plate 2 : 21, 23, 27, 29, 31, 33 hole circles
If is proposed to mill a spur gear of 28 teeth using simple indexing method. Which one of the following combinations of index plate and number of revolutions is correct?

• APlate 1 : 1 revolution and 9 holes in 18 hole circles
• BPlate 2 : 1 revolution and 9 holes in 21 hole circles
• CPlate 2 : 1 revolution and 9 holes in 33 hole circles
• DPlate 1 : 1 revolution and 9 holes in 15 hole circles

• 1969 attempts
• 7 upvotes
• 30 comments