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### MACHINIST (THEORY) SEM-3 FEB 18

MACHINIST (THEORY) SEM-3 FEB 18

Taper can be expressed by ratio, the taper ratio is 1:20. What is the meaning of 1:20?
a. For a taper length of 20 units the difference in diameter is 1 unit
b. For a taper length of 1 units the difference in diameter is 20 unit
c. For a taper length of 20 units the difference in diameter is 20 unit
d. For a taper length of 20 units the difference in diameter is 10 unit

The self-holding tapers have a taper angle limited to a maximum of decrees,
a. 1.5 b) 3 c. 2.5 d. 3.5

The quick releasing taper angle is not less than ........  Degrees.
a. 6  b. 2  c . 18  d. 24

Metric tapers are expressed by numbers. The number represent the...........
a. Smaller dia of taper
b. Half angle of taper
c. Bigger dia of taper
d, Included angle of taper

Included angle of metric thread is 60. The formula for depth of thread is..........
a. 1.268 x pitch
b. 0.613 x pitch
c. 1.068 x pitch
d. 0.812 x pitch

b. Lead X number of starts
c. Pitch X number of starts
d. Helix angle X pitch

Multi start threads are cut on parts to have.......
a. Slower transmission
b. Faster transmission
c. Smooth transmission
d. Average speed transmission

A square thread is designated as per IS is sq. 60 X 9. The meaning of 60 is..........
a. Nominal dia
b. Pitch dia
c. Root dia
d. Clearance dia

In the metric Acme thread, included angle is degrees
a. 29.  b. 30   c. 29.5  d.  30.5

a. Shaping machine feed screw
b. Late longitudinal feed screw
c. Milling machine feed screw
d. Cross slide of lathe

Acme threads is the category of-

In a lathe machine irregular shaped work pieces, jig & fixtures are firmly clamped on-
a. Three jaw chuck
b. Catch plate
c. Four jaw chuck
d. Face plate

Reamers are used to-
a. Enlarge the drilled hole
b. Finish the size of the hole
c. Correct the position of the hole
d. Remove the rough material

In a lathe, the tool operated from tailstock to towards the head stock is called...........
a. Left hand tool
b. Plunge cutting tool
c. Right hand tool
d. Forming tool

Name the tool, which reproduce the shape and form of the tool on the workpiece?
a. Turning tool
b. Forming tool
c. Parting tool
d. Chamfering tool

In a single point tool the clearance angles are provided to-
a. Influence the cutting action
b. Avoid rubbing action
c. Facilitate to con&ol the chip movement
d. Increase the strength of the cutting edge

In a single point tool, the angle ground on the top of the tool is called-
a. Clearance angle
b. Wedge angle
c. Rack angle
d. Approach angle

Many materials are subject to transfonnation from solid to liquid at different temperature is called-
a. Structure
b. Fusibility
c. Conductivity
d. Ductility

The property of the metal which can be drawn into wire is termed as.........
a. Tenacity
b. Ductility
c. Hardness
d. Brittleness

The ability to withstand scratching and wear on metal is called..........
a. Tenacity
b. Ductility
c. Hardness
d. Brittleness

The ability to resist the effects of tensile forces without rupture is called
a. Tenacity
b. Ductility
c. Hardness
d. Brittleness

The property of metal to withstand shock or impact load is called..........
a. Tenacity
b. Ductility
c. Hardness
d. Brittleness

How many ftmdamental deviations are in the BIS system?
a. 13 b. 20 c. 16 d. 25

In BIS system how many grades of tolerances are there?
a. 12 b. 16 c. 14 d. 18

In limit fit, tolerance and allowance, the difference between the maximum limit & minimum limit is called.......
a. Tolerance
b.Clearance
c.Allowance
d. Deviation

In 25H7, what is the meaning of 'H'?
a. External dimension
b. Deviation in dimension
c. Intemal dimension
d. Allowance in dimension

The size of component in drawing is 20+or-0.005. What is the maximum limit size of the component?
a. 20.005 b. 19.995
c. 20.008 d. 19.992

To slot a convex surface, the required tool cutting is-
a. Square nose tool
b. Key way tool
c. Round nose tool
d. Cornering tool

The convex surface can be slotted by using........
a. Longitudinal feed
B. Cross feed
c. Rotary feed
d. Vertical feed

Which one is not a reason for the ovality in curvature, while slotting the concave or convex surface?
a. Incorrect aligning
b. Cross feed is not locked
c. The longitudinal feed is not locked
d. Fine rotary feed

A spur gear to be cut on a slotting machine with 18 numbers of teeth, using rotary table.
What will be the indexing movement of the rotary table?
a.18°  b. 22°   c. 20°  d. 24°

On a slotting machine, to cut internal spine the cutting tool used is..........
a. Multipoint cutting tool
B. Solid cutter
c. Former cutter
d. Single point formed tool

In a slotting machine, the cutting pressure acts along the.........
a. Perpendicular the tool
b. Length of the tool
c. Diagonal to the tool
d. Cutting edge of the tool

Aluminium oxide grinding wheels are used for grinding-
a. Aluminium
b. Mild steel
c. Cast iron
d. Die steel

Green silicon carbide is used for grinding-
a. Hard material
b. Cemented carbide
c. Soft material
d. High speed steel

Grain size or grit size in grinding wheels are indicated by-
a. Alphabet
b. Alphabet & numerical
c. Numerical
d. Sign

In grinding wheel the term "grade" indicate...........
a. Amount of bond present between the grain
b. The actual size of abrasive
c. The degree of hardness possessed by bond
d. It does actual cutting

Bonds of ginding wheels are indicated by alphabet, which letters used to indicate resinoid bond?
a. V    b. S   c. E  d. B

A device which holds, supports, locates & also guide tool during operation is called..........
a. Jig
c. Work holding
b. Fixture
d. Tool holding device

Which of the following machine, the spindle axis is normally perpendicular to the table surface?
a. Plain milling machine
b. Universal milling machine
c. Horizontal milling machine
d. Vertical milling machine

Which one of the following part, is attached to the column of a vertical milling machine?
a. Base b. Column

In a milling cutter, the included angle between the land and face of the tooth is called...........
a. Negative rake angle
c. .Helix angle
b. Axial rake angle
d. Lip angle

A grinding wheel, which easily dislodges the abrasive grain is-
a. Soft wheel
b. Hard wheel
c. Medium wheel
d. Very hard wheel

Which one of the following bonds are marked with letter 'E'?
a. Vitrified bond
b. Shellac bond
c. Silicate bond
d. Resinoid bond

The size of the abrasive in a grinding wheel is termed as-
a. Grit b. Bond

The standard range of sizes covered in BIS system of limits and fits are-
a. O to 10 mm
b. 0 to 400 mm
c. O to 100 mm
d. 0 to 500 mm

The algebraic difference between the actual size and its corresponding basic size is termed as-
a. Deviation
b. Upper deviation
c. Lower deviation
d. Actual deviation

The rotary table of the slotting machine is mounted on top of the-
b) Cross-slide Column
c. Column

Rotary table of a slotting machines are provided with the mechanism of-
a. Cam
b. Rack and pinion
c. Eccentric
d. Worm and worm wheel

Which of the following planing machine, a wide range of ram speed can be obtained?
a. Pit planing machine
b. Hydraulic planing machine
c. Plate planing machine
d. Divided table planing machine