Q.1

The average cutting speed for turning mild steel with a high speed steel tool is

  • 15 to 19 m/min
  • 25 to 31 m/min
  • 60 to 90 m/min
  • 90 to 120 m/min
Q.2

Tumbler gears in lathe are used to

  • reduce the spindle speed
  • cut gears
  • give desired direction of movement to the lathe carriage
  • drill a workpiece
Q.3

A lathe with four steps on the cone pulley and with backgears will have

  • four direct speeds
  • four indirect speeds
  • four direct and four indirect speeds
  • eight indirect speeds
Q.4

A fine grained grinding wheel is used to grind

  • hard and brittle materials
  • soft and ductile materials
  • hard and ductile materials
  • soft and brittle materials
Q.5

The process of improving the cutting action of the grinding wheel is called

  • truing
  • dressing
  • facing
  • clearing
Q.6

Ceramic cutting tools are

  • made by cold pressing of aluminium oxide powder
  • available in the form of tips
  • brittle and have low bending strength
  • all of these
Q.7

Which of the following statement is correct as regard to up milling?

  • It can not be used on old machines due to backlash between the feed screw of the table and the nut.
  • The chips are disposed off easily and do not interfere with the cutting.
  • The surface milled appears to be slightly wavy.
  • The coolant can be poured directly at the cutting zone where the cutting force is maximum.
Q.8

Gear finishing operation is called

  • shaping
  • milling
  • hobbing
  • burnishing
Q.9

A bottoming tap has

  • its end tapered for about three or four threads
  • its end tapered for about eight or ten threads
  • full threads for the whole of its length
  • none of the above
Q.10

The drill spindles are provided with standard taper known as

  • Morse taper
  • Seller's taper
  • Chapman taper
  • Brown and Sharpe taper
Q.11

The angle between the face of the tool and a line tangent to the machined surface at the cutting point is called cutting angle.

  • Correct
  • Incorrect
Q.12

The parameter which completely defines the chip formation in a metal cutting process is

  • shear angle
  • chip-tool contact length
  • both (a) and (b)
  • none of these
Q.13

EDM machining is applied for

  • shaping carbide dies and punches having complicated profiles
  • making large number of small holes in sieves and fuel nozzles
  • embossing and engraving on harder materials
  • all of these
Q.14

The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is __________ cutting speed for drilling mild steel with high speed steel drills.

  • equal to
  • less than
  • more than
Q.15

In determining the various forces on the chip, Merchant assumed that the

  • cutting edge of the tool is sharp and it does not make any flank contact with the workpiece
  • only continuous chip without built-up-edge is produced
  • cutting velocity remains constant
  • all of the above
Q.16

The average cutting speed for turning mild steel with a high speed steel tool is

  • 15 to 19 m/min
  • 25 to 31 m/min
  • 60 to 90 m/min
  • 90 to 120 m/min
Q.17

In electro-discharge machining, the tool is connected to cathode.

  • Correct
  • Incorrect
Q.18

Stellite preserve hardness upto a temperature of

  • 350°C
  • 500°C
  • 900°C
  • 1100°C
Q.19
The angle included between the two lips projected upon a plane parallel to the drill axis and paralled to the two cutting lips, is called helix angle.
  • Correct
  • Incorrect
Q.20
The lip angle of a single point tool is usually
  • 20° to 40°
  • 40° to 60°
  • 60° to 80°
  • none of these
Q.21
Side rake angle of a single point cutting tool is the angle
  • by which the face of the tool is inclined towards back
  • by which the face of the tool is inclined sideways
  • between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of the tool
  • between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base
Q.22
Grinding wheels should be tested for balance
  • only at the time of manufacture
  • before starting the grinding operation
  • at the end of grinding operation
  • occasionally
Q.23
The velocity of tool relative to the workpiece is known as cutting velocity.
  • True
  • False
Q.24
In ultra-sonic machining, the metal is removed by
  • using abrasive slurry between the tool and work
  • direct contact of tool with the work
  • maintaining an electrolyte between the work and tool in a very small gap between the two
  • erosion caused by rapidly recurring spark discharges between the tool and work
Q.25
In hot machining, tool is made of
  • tungsten carbide
  • brass or copper
  • diamond
  • stainless steel
Q.26
If the helix angle of the drill is made __________ 30°, then the torque required to drive the drill at a given feed will be more.
  • equal to
  • less than
  • more than
  • All of above
Q.27
The different spindle speeds on a lathe form
  • arithmetical progression
  • geometrical progression
  • harmonical progression
  • any one of these
Q.28
Lapping is an operation of
  • making a cone-shaped enlargement of the end of a hole
  • smoothing and squaring the surface around a hole
  • sizing and finishing a small diameter hole
  • producing a hole by removing metal along the circumference of a hollow cutting tool
Q.29
In orthogonal cutting system, the maximum chip thickness occurs at the middle.
  • Correct
  • Incorrect
Q.30
The machining of titanium is difficult due to
  • high thermal conductivity of titanium
  • chemical reaction between tool and work
  • low tool-chip contact area
  • none of these
0 h : 0 m : 1 s