52) Find out the speed setting (rpm) for a high speed steel drill D24 to cut a work piece of phosphor bronze. Maximum cutting speed with HSS for Phosphor Bronze is 35 m/min.

53) What is the clearance angle if the angle of inclination of a chisel, with point angle 60 degree, is 39.5 degree?

54) In a vernier caliper, 100 divisions of the vernier scale occupies x divisions (mm) of the main scale. Find out the value of x if the least count of the vernier scale is 0.01 mm.

55) A Metric outside micrometer of range 100-125 mm is used to measure the diameter of a rod. Barrel graduation showed 16.5 and the thimble graduation in line with the barrel datum line was 28. What is the diameter of the rod?

56) While facing a job in lathe, a pip left in the centre is caused due to