1) Counterboring is done for .....................
Finishing cored holes
Deburring hole ends
Accommodating socket head screw
Enlarging holes to accurate size
Correct answer
Enlarging holes to accurate size
2) Most widely used materials for lathe cutting tool is ................
Mild steel
Medium carbon steel
Plain carbon steel
High carbon steel
Correct answer
High carbon steel
3) The suitable cutting fluid for machining mild steel is ..............
Distilled water
Soluble oil + water
Neat cutting Oil
Synthetic soluble oil
Correct answer
Soluble oil + water
4) Which one of the following is an artificial abrasive?
silicon carbide
Corundum
diamond
Emery
Correct answer
silicon carbide
5) For irregularly shaped workpiece on a lathe the work holding accessory used is ................
Two jaw chuck
Three Jaw Chuck
Driving plate
Faceplate
Correct answer
Faceplate
6) While normalizing the component should be cooled .........................
By forced air
By quenching in oil
By dipping in water
In still air to room temperature
Correct answer
In still air to room temperature
7) The purpose of normalizing is to ..............
Refine the structure
Harden the surface
Increase the toughness
Soften the metal
Correct answer
Refine the structure
8) The process of heating and cooling for changing the structure of steel for obtaining the required properties is called .................
Hardening
Tempering
Annealing
Heat treatment
Correct answer
Heat treatment
9) It is possible to measure the angle of a component to an accuracy of one minute with .....................
Vernier caliper
Combination set
Bevel protractor
Sine bar with slip gauge
Correct answer
Sine bar with slip gauge
10) Which gauge is suitable to check the dimensional limit of the length of a shaft?
Snap gauge
Progressive gauge
Plug gauge
Ring gauge
Correct answer
Snap gauge
11) Centre line of the contact rollers and datum surface of the sine bar are ..............
Same line
Perpendicular
Inclined
Parallel
Correct answer
Inclined
12) Which type of fit is used in the inner race with shaft while mounting a ball bearing?
Precision side
Interference
Large clearance
Loose running
Correct answer
Loose running
13) The process of heating the steel above the critical temperature and cooling it in open atmospheric air is known as .....................
Hardening
Normalizing
Annealing
Tempering
Correct answer
Annealing
14) The other name of rolling contact bearing is ...................
Journal bearing
Pedestal bearing
Frictionless bearing
Bush bearing
Correct answer
Frictionless bearing
15) On a center lathe, the threads of various feed and pitch can be obtained by .....................
Back gear
Apron system
Quick change gearbox
Tumbler gear system
Correct answer
Tumbler gear system
16) A screw capable of setting matching parts through their threaded holes and does not remain projected over this setting is called ...............................
Round head screw
Crease head screw
Lower head screw
Pan head screw
Correct answer
Lower head screw
17) The drilled hole is larger than the size of the drill. The reason is .................
Too much feed
Unequal length of the cutting edges
Helix angle not accurate
Lip clearance not accurate
Correct answer
Unequal length of the cutting edges
18) The smaller unit of an angle is ...................
Second
Radian
Degree
Minute
Correct answer
Second
19) Choose the correct formula to find the dia of the job (d) in mm, if the cutting speed (y) is m/min and revolution per minute (n) are given
20) Which one of the following tool angle controls the chip formation while plain turning?
Approach angle
Side clearance angle
Top rake angle
Front clearance angle
Correct answer
Top rake angle
21) Which angle makes rake angle in a twisted drill?
Point angle
Helix angle
Lip clearance angle
Chisel angle
Correct answer
Lip clearance angle
22) Taper angle for tilting cross-slide method is calculated by ..............
sin ø =D—d / 2l
cos ø =D—d / 2l
tan ø =D—d / 2l
All of these
Correct answer
tan ø =D—d / 2l
23) To set an angle using sine bar the height of the slip gauges and the length of the sine bar which forms the ratio of ...............
sin ø
cos ø
tan ø
cot ø
Correct answer
sin ø
24) Measuring gauges require wear resistance, which heat treatment process is required to get new properties ................
Normalizing
Tempering
Case hardening
Annealing
Correct answer
Case hardening
25) Which one of the following formula is applied to find the tailstock offset when turning tapers by offset method?
(D—d) / l
(D—d) / l
(D — d) x L/2l
(d — D) / 2l
(D—d) / 2l
Correct answer
(D — d) x L/2l
what will be the result if the clearance angle in drill is increased
ReplyDeletethe main purpose of using worm and worm wheel drives in machines and their accessories is to
a hole which is not made through full depth of the component is known as
countersinking
counterbore hole dimensions
countersink vs counterbore advantages