I.O.F. Chargemen Mechanical Online Mega Test

100 Questions | By Royalmech | Last updated: Oct 28, 2014 | Total Attempts: 252

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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