Materials, Manufacturing and Industrial Engineering - Online Test
Q1. In a DC arc welding operation, the voltage-arc length characteristic was obtained as Varc = 20 + 5l where the arc length l was varied between 5 mm and 7 mm. Here Varc denotes the arc voltage
in Volts. The arc current was varied from 400 A to 500 A. Assuming linear power source
characteristic, the open circuit voltage and the short circuit current for the welding operation are
Answer : Option C
Explaination / Solution:
No Explaination.
Q2. In a single pass rolling process using 410 mm diameter steel rollers, a strip of width 140 mm and
thickness 8 mm undergoes 10% reduction of thickness. The angle of bite in radians is
Answer : Option C
Explaination / Solution:
No Explaination.
Q3. Calculate the punch size in mm, for a circular blanking operation for which details are given
below.
Size of the blank 25 mm
Thickness of the sheet 2 mm
Radial clearance between punch and die 0.06 mm
Die allowance 0.05 mm
Answer : Option A
Explaination / Solution:
No Explaination.
Q4. Two cutting tools are being compared for a machining operation. The tool life
equations are:
Carbide tool: VT1.6 = 3000
HSS tool: VT0.6 = 200
Where V is the cutting speed in m/min and T is the tool life in min. The carbide
toll will provide higher tool life if the cutting speed in m/min exceeds
Answer : Option B
Explaination / Solution:
No Explaination.
Q5. Cylindrical pins of 
mm diameter are electroplated in a shop. Thickness of
the plating is 30+2.0 micron. Neglecting gage tolerances, the size of the GO gage
in mm to inspect the plated components is
mm diameter are electroplated in a shop. Thickness of
the plating is 30+2.0 micron. Neglecting gage tolerances, the size of the GO gage
in mm to inspect the plated components is
Answer : Option B
Explaination / Solution:
Go gauge = max. Limit = 25.052
Q6. During the electrochemical machining (ECM) of iron (atomic weight=56,
valency=2) at current of 1000 A with 90% current efficiency, the material
removal rate was observed to be 0.26 gm/s. If Titanium (atomic weight = 48,
valency=3) is machined by the ECM process at the current of 2000 A with 90%
current efficiency, the expected material removal rate in gm/s will be
Answer : Option C
Explaination / Solution:
Q7. In orthogonal turning of a bar of 100 mm diameter with a feed of 0.25 mm/rev,
depth of cut of 4 mm and cutting velocity of 90 m/min, it is observed that the
main (tangential) cutting force is perpendicular to the friction force acting at the
chip-tool interface. The main (tangential) cutting force is 1500 N.
The normal force acting at the chip-tool interface in N is
Answer : Option B
Explaination / Solution:
No Explaination.
Q8. The effective number of lattice points in the unit cell of simple cubic, body centered cubic, and face
centered cubic space lattices, respectively, are
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. Friction at the tool-chip interface can be reduced by
Answer : Option D
Explaination / Solution:
No Explaination.
Q10. Two streams of liquid metal, which are not hot enough to fuse properly result into a casting defect
known as
Answer : Option A
Explaination / Solution:
No Explaination.
