I.O.F. Chargemen Mechanical Online Mega Test
- 1.Which one of the following materials is used as the bonding material for grinding wheels
- A.
Silicon carbide
- B.
Sodium silicate
- C.
Boron carbide
- D.
Aluminium oxide
- 2.In reaming process
- A.
The metal removal rate is high
- B.
High surface finish is obtained
- C.
High form of accuracy is obtained
- D.
High degree of tolerance achieved
- 3.In the griding wheel have specification A60G7B23, B stands for the
- A.
Resinoid bond
- B.
Rubber bond
- C.
Shellac bond
- D.
Silicate bond
- 4.Wheel loading in grinding is defined as
- A.
Types of wheel bond fracture
- B.
Types of wheel grain fracture
- C.
Sticking of small particle on grinding wheel
- D.
None of the above
- 5.Helix angle of a fast helix drill is normally
- A.
35
- B.
60
- C.
90
- D.
5
- 6.A milling cutter having 8 teeth is rotating at 150 rpm. if the feed per tooth is 0.1 mm, the value of thew table speed in mm/min is
- A.
120
- B.
187
- C.
125
- D.
70
- 7.In turning of slender rods, it is necessory to keep the transverse force minimium mainly to
- A.
Improve the surface finish
- B.
Increase productivity
- C.
Improve cutting efficiency
- D.
Reduce vibrations and chatter
- 8.Among the conventional, machining process maximium specifiec energy is consumed in
- A.
Grinding
- B.
Drilling
- C.
Planing
- D.
Turnig
- 9.Which of the following is true regarding milling machine
- A.
Up (climb) milling provides better surface finish while down milling provide longer tool life
- B.
Up milling provides longer tool life while down milling provide better surface finish
- C.
Up milling is provide both better tool life as well as better surface finish
- D.
Down milling provide better surface finish as well as longer tool life
- 10.Which of the following is hardest materials next to diamond
- A.
Aluminium oxide
- B.
Silicon carbide
- C.
Cubic boron nitride
- D.
Cemented carbide
- 11.Consider the following statements regarding NC machine tools
- A.
They reduce non productive time
- B.
They reduce fixturing
- C.
Niether 1 nor 2
- D.
Both 1 and 2
- 12.The bottles from thermo plastic materials are made by
- A.
Compression moulding
- B.
Extrusion with mandrel
- C.
Injection moulding
- D.
blow moulding
- 13.The process of producing components in moulds without the application of pressure, is known as
- A.
Moulding
- B.
Laminating
- C.
Casting
- D.
Calendering
- 14.Which of the following materials used for car tyres as a standard material
- A.
Styrene butadiene rubber
- B.
Butyl rubber
- C.
Nitrile rubber
- D.
Any one of the above
- 15.In powder metallurgy, the operation carried out to improve the bearing property of a bush is called
- A.
Infilteration
- B.
Impregnation
- C.
Plating
- D.
Sintering
- 16.Deep hole drilling of small diameter say 0.2 mm is done with EDM by selecting the tool material as
- A.
Copper wire
- B.
Graphite
- C.
Brass wire
- D.
Tungston wire
- 17.Which one of the followng principle responcible for metal removal rate in ultra sonic machining
- A.
Plastic shear
- B.
Melting and vapourization
- C.
Erosion and brittle fracture
- D.
Corrosive reaction
- 18.Cold shortness is defined as the
- A.
Fracture in room temperature below their recrystallization temperature
- B.
Brittelness in room temperature below their recrystallization temperature
- C.
Loss of ductility above recrystallization temperature
- D.
Decrease of brittleness in room temperature
- 19.The compositions of some of the alloy steels are as under
- A.
18 W 4 Cr 1 V
- B.
12 Mo 1 W 4 Cr 1 V
- C.
6 Mo 6 W 4 Cr 1 V
- D.
18 W 8 Cr 1 V
- 20.The straigh grades of cemented carbide cutting tool materials contain
- A.
Tunsten Carbide only
- B.
Tungsten carbide and titanium carbide
- C.
Tungsten carbide and cobalt
- D.
Tungsten carbide and cobalt carbide
- 21.In a mechanical shaper the length of stroke is increased by
- A.
increasing the centre distance of bull gear and crank pin
- B.
Decreasing the centre distance of bull gear and crank pin
- C.
Increasing the length of arm
- D.
Decreasing the length of slot in the slotted lever
- 22.A Grinding wheel of 150mm diameter is rotating at 3000 rpm. The grinding speed is
- A.
7.5 π m/s
- B.
15π m/s
- C.
45π m/s
- D.
450π m/s
- 23.Trepanning is performed for
- A.
Finishing a drilled hole
- B.
Producing a Large hole without drilling
- C.
Truing a hole for Alignment
- D.
Enlarging a Drilled hole
- 24.A Lead Screw with half nuts in a lathe, Free to Rotate in both Direction has
- A.
V-threads
- B.
Whithworth threads
- C.
Buttress threads
- D.
ACME threads
- 25.A Dynameter is a device used for the measurement of
- A.
Chip thickness ratio
- B.
Forces during metal cutting
- C.
Wear of the cutting tool
- D.
Deflection of cutting tool
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