Machinist theory sem 3 jan 17 questions

Machinist theory sem 3 jan 17 questions

In order to get a perfect cylindrical hole .............
a) First drilling, reaming and then boring should be done
b) First drilling boring and then reaming shall be done
c) Drilling and reaming
d) Drilling

To turn short tapers on a long job. the taper turning methods to be used ...............
a) Compound slide tilting method b) Tailstock off set method
c) Form tool method d) Taper turning attachment

On lathes, the follow rest ..............
a) Moves along with the job b) Remains stationary
c) Clamps the job d) Guides the cutting tool

On lathe machines, draw bar and collet is ................
a) Work holding device b) Work supporting device
c) Power transmission system d) Tool holding device

For step turning on lathe, the tool to be used ..................
a) Single point finishing tools b) Single point roughing tools
c) Threading tools d) Special purpose tool

Un symmetrical job on lathe machine are generally hold by .........
a) Three jaw checks b) Four jaw check  c) Face plate d) Fixtures

If the tools is placed below the centre of the job ..............
a) The clearance angle is decreased then top rake angle is increased
b) The top rake angle is reduced and clearance angle is increased
c) Approach angle is reduced
d) None of the above

On lathe the feed is expressed as -......
a) Revolution per min    b) Distance travelled by tool per minute
c) Distance travelled by tool per revolution   d) Lquals to cutting speed

To rotate a job of dia 32 mm on lathe, having cutting speed as 25 metres/min. the RPM shall be ..........
a 245 b) 250 c) 260 d) 300

The best electrode material to be used on EDM machine is -
a) Cast iron b) Copper c) Steel d) Brass

For turning segments of spheres, the attachment to be used -
a) Relieving attachment b) Rapid traverse attachment
c) Ball turning attachment d) Milling attachment

On lathe machine, the power transmitted to lead screw, feed bar and apron is through -
a) Carriage b) Head stock c) Tail stock d) Cross slide

The most common method to produce bolts in mass production is -
a) Thread Rolling b) Thread cutting on lathe
c) Thread whirling d) Thread plunge grinding

Shape of thread obtained by thread cutting operation on lathe is -
a) Cyoloidal b) Trichoidal c) Elliptical d) Helical

The rotary motion to work is given during turning between centres by -
a) Three jaws chuck b) Four jaws chuck  c) Dog carriers d) Head stock

The ability of material to break under impact load is called -
a) Brittleness b) Machinabilitv c) Tempering d) Hardness

To obtain good finish of the threads on lathe, threads should be cut
a) Tilting compound slide methods b) Thread chasers
c) Threading die d) Thread whirling

Telescopic gauges are used on lathe to measure -
a) Bore size b) Run out c) Concentricity       d) Circularity

Sine bars are used to measure -
a) Taper angle b) Surface roughness  c) Fitment between shaft and hole d) Gap between surfaces

While machining aluminium on lathe at high speeds, the types of chips produced -
a) Discontinuous b) Continuous  c) Continuous with BUE d) None of these

The carbide tools are made by process -
a) Sintering b) Machining c) Moulding d) Power coating

Eccentric turning is done by —
a) Off setting the tall stock b) Between centres c) Off setting the job d) Off setting the tool

The jaws of four jaw chuck are stepped
a) Add appearance b) To increase the gripping power
c) To hold hollow cylindrical jobs   d) Four step turning

The relief behind the cutting edge on drill is called -
a) Lip clearance angle b) Helix angle  c) Chisel angle d) Rake angle

In 20 H7/p6, H7/p6, the type of fit is -
a) Clearance fit b) Interference fit  c) Transition fit d) None of these

Jigs are used to -
a) Hold the job    b) Locate the job  c) Hold, locate the job and to guide the rotating tool   d) To guide the cutting tool

Fixture are used to -
a) Hold the job   b) Locate the job   c) Hold and locate the job     d) None of these

The property of material by which it can be drawn into sheet is called -
a) Elongation b) Toughness c) Malleability d) Extrusion

D N C Stands for -
a) Direct Numerical Control  b) Due Numerical Control  c) Duel Number Control   d) None of these

On lathe simple gear train ratios is -
a) Rotation of Lead screw / rotation of spindle   b) Rotation of spindle / pitch of lead screw
c) Lead of lead screw/RPM of job                      d) RPM of job/Lead of lead screw

While cutting multi start threads on lathe, lead to be set on machine -
a) The pitch to be cut b) No's of starts x pitch to be cut
c) Pitch of lead screw/pitch of job d) Pitch of job/pitch of lead screw

The attachment used for rapid and fast return of the carriage is -
a) Follower Rest b) Relieving attachment
c) Rapid traverse attachment d) Copy turning attachment

To cut dovetail slot, key way slot on lathe, the attachment used is -
a) Relieving attachment b) Milling attachment
c) Bail turning attachment d) Slitting attachment

Norton gear fox is provided on lathes to -
a) Cut the threads b) Cut the warm wheel  c) Provide various feed d) For changing RPM

Trepanning is a lathe operation in which -
a) Enlarging the existing hole
b) Providing groove at a specific location
c) Cutting big holes in which material is not removed fully in form of chips
d) None of the above

Machining time in lathe is calculated as -
a) Nos. of passes x length of work / feed x RPM
b) Feed x RPM/length of work
c) Nos. of passes x feed x RPM/length of work
d) Cutting speed x feed x nos. of cuts

In planers -
a) Tool reciprocate and work is given feed b) Work reciprocates and tool is feeded
c) Work rotates and tool is feeded d) Tool rotates and work is feeded

Rack milling attachment on milling is -
a) Used to cut the gears  b) To cut slots
c) To cut warm wheels   d) To cut straight or inclined racks

For cutting helical reamers on milling machines -
a) The lead screw of table and dividing head spindle are connected with gears
b) The spindle of machine and lead screw of table are connected with gears
c) The vertical slide and dividing head spindle are connected with gears
d) None of the above

The causes of glazing of grinding wheel -
a) Grain size too fine b) Wheel is hard c) Wheel speed is too low d) More depth of cut

In the designation of straight cup grinding wheel 150x20x32, the number 32 indicates -
a) ID b) OD c) Depth of impregnation d) Grain size

The structure of grinding wheel represents -
a) Density of grains and voids                     b) Type and size of grains
c) Bonding material surrounding grains      d) Grain size

Grade of grinding wheel represents -
a) Strength of bonding material             b) Grit size
c) Type and size of bonding material    d) Bonding material surrounding grains

For sharpening the helix of a reamer, the accessory used is -
a) Centre supports b) Universal work head
c) Spiral Grinding attachment d) Machine vice

The secondary clearance angle of tooth of milling cutter varies -
a) 2° to 5° b) 5° to 12°  c) 12° to 15° d) 18° to 20°

To grind short taper ANGLE of a cylindrical grinding machine -
a) The work table should be tilted
b) The wheel head should be tilted
c) The work and the wheel head both should be tilted
d) None of the above

Snap gauges are used for -
a) Checking pitch of threads     b) Checking internal diameter
c) Checking external diameter  d) Fitment of hole and shaft

The water to soluble oil ratio for the purpose of grinding
a) 5 : 1 b) 15 : 1 c) 20 : 1

For reaming a hole on drilling machine -
a) The job shall be rigidly clamped b) The job shall be kept floating
c ) Both reamer and job shall be floating      d) None of these

In a hydraulic power, the purpose of pressure gauge is -
a) To regulate the pressure b) To indicate the pressure
c) To relieve the pressure d) To control the direction of flow

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