DRILLING

What is the reason if the drilled hole is larger than the drill size? Drill is not sharp Feed rate is too high Cutting speed is too high Unequal angle of cutting edge

What is the term, the top surface joining the two sides of a thread? Root Crest Flank Pitch

What V denotes in grinding wheel specification 32A46H8V? Bond Grade Abrasive Grain size

What type of abrasive wheel is used for grinding die steel? Silicon carbide Green silicon carbide White aluminum oxide Brown aluminum oxide

What is the name of the tool?

Reamer Spot facing tool Countersink tool Counter boring tool

Which angle determines the rake angle of drills? Helix angle Core angle Point angle Chisel edge angle

What is the drill size for Ø 15 mm reaming hole? 14.75 mm 14.50 mm 15.25 mm 14.65 mm

Why drilled holes are oversized in drilling operation? Drill is not sharp Unequal lip length Feed rate is too high Cooling is insufficient

What is the name of the operation producing flat seat on drilled hole? Drilling Spot facing Countersinking Counterboring

What is the purpose of flute in drill? To drive out the chips To reduce the weight To reduce the cost To increase the speed

What is the angle of countersink tool used on holes to be threaded? 75° 80° 90° 120°

What is the formula to calculate the blank size of external thread (where p=pitch and d=depth)? D = d - p/10 D = d + p/10 D = d x p/10 D = d / p/10

Which type of thread, the crest and roots are rounded to form a semicircle? Acme thread Square thread Knuckle thread Trapezoidal thread

What 5 denotes in grinding wheel specification 41A46H5U8? Bond Abrasive Structure Grain size

Which type of bonded wheel is used in foundries for dressing castings? Silicate bond Shellac bond Rubber bond Resinoid bond

What type abrasive wheel is used for grinding cemented carbides? Green silicon carbide Grey aluminum oxide White aluminum oxide Brown aluminum oxide

What is the method of removing broken stud? Ezy-out Prick punch Making drill hole Using square taper punch

Why grey cast iron widely used for machine tools? Rapid cooling Reduce vibration High tensile strength Very difficult to machining

What is the tap drill size for M20 x 15? 18.5 20 19 17

What is the drill hole size for 16 mm reamer? 15.75 mm 15.50 mm 14.65 mm 16 mm

What is the size of drilled hole for reaming, Ø 10 mm? 8.5 mm 9.75 mm 10.00 mm 10.25 mm

Why drilled holes are over size than drill diameter? Feed ratio is more Cooling is in effective Insufficient clearance angle Unequal length of cutting edge

What is the countersink angle of chamfering in the end of drilled hole for threading? 75° 80° 90° 120°

Why centre screw is provided in the die stock? To tighten the die To adjust the depth of cut To adjust the dia of internal thread To adjust the dia of external thread

What is the included angle of metric v threads? 45° 29° 60° 47.5°

What 46 represent in standard marking system of grinding wheel (32A46H8V)? Grade Grain size Type of bond Type of abrasive

What is the color of aluminum metal? Dull white White Bright white Bluish grey colour

What H denotes in the specifications of grinding wheel 32A46H8V? Grain size Type of abrasive Grade Structure

Why precision instruments are made of invar steel? Durability Cheaper in cost Surface finishing is fine Least coefficient of expansion

Why limestone serves as flux added to the ore in the blast furnace? To form molten slag To supply the oxygen To burn the carbon in coke To increase the melting point of ore

Which micrometer having provision of interchangeable anvils? Depth micrometer Inside micrometer Outside micrometer Screw thread micrometer

Which factor determine the selection of wire in screw thread micrometer? Thread angle Type of thread and pitch Root and crest Major diameter

What is measured with telescopic gauge? Depth External dimension Angular dimension Size of holes, slots and recesses

What is produced from blast furnace? Pig iron Cast iron Wrought iron Malleable iron

What is the minimum dimension can measure with telescopic gauge? 8.0 mm 12.7 mm 19.0 mm 15.0 mm

Which cast iron has the ability to minimize tool chatter in machine tools? Grey cast iron White cast iron Nodular cast iron Malleable cast iron