A hole is specified as The mating shaft has a clearance fit with
minimum clearance of 0.01 mm. The tolerance on the shaft is 0.04 mm. The
maximum clearance in mm between the hole and the shaft is
Q2.In orthogonal turning of low carbon steel pipe with principal cutting edge angle
of 90o, the main cutting force is 1000 N and the feed force is 800 N. The shear
angle is 25o and orthogonal rake angle is zero. Employing Merchant’s theory, the
ratio of friction force to normal force acting on the cutting tool is
Q5.In abrasive jet machining, as the distance between the nozzle tip and the work surface increases,
the material removal rate
Answer : Option DExplaination / Solution:
Graph of abrasive flow rate v/s tool tip distance metal removal rate is proportional to abrasive
flow rate. As the tool tip distance increase, area of contact increases which results in higher metal
removal rate. But after a certain distance, the jet looses its velocity, hence metal removal rate
decreases.
Q6.A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2 mm depth by a
cutter of 10 mm diameter between points (0, 0) and (100, 100) on the XY plane (dimensions in
mm). The feed rate used for milling is 50 mm/min. Milling time for the slot (in seconds) is
Answer : Option BExplaination / Solution:
Given data: width (b) = 10 mm
Q8.A fillet welded joint is subjected to transverse loading F as shown in the figure. Both legs of the
fillets are of 10 mm size and the weld length is 30 mm. If the allowable shear stress of the weld is
94 MPa, considering the minimum throat area of the weld, the maximum allowable transverse
load in kN is
Answer : Option CExplaination / Solution: No Explaination.
Q9.In a single pass drilling operation, a through hole is 15 mm diameter is to be drilled in a steel
plate of 50 mm thickness. Drill spindle speed is 500 rpm, feed is 0.2 mm/rev and drill point angle
is 118°. Assuming 2 mm clearance at approach and exit, the total drill time (in seconds) is
Answer : Option AExplaination / Solution: No Explaination.