1) Ceramic materials__________________? a. Are exemplified by clay and mica b. Are poor electrical conductors due to lack of free electrons c. Never exhibit polymorphism d. All A., B. and C.
|
||||
2) Duralumin is an alloy of_________________? a. Aluminium, copper and manganese b. Aluminium, nickel and silicon c. Aluminium and nickel d. None of these
|
||||
3) Hardening of steel is not possible unless it is heated ______________ critical point? a. Above the highest b. Above the lowest c. Between the first & second d. Between the second & third
|
||||
4) DDT is shipped in_________________? a. Stainless steel containers b. Paper bags c. Fibre drums d. Either B. or C.
|
||||
5) ______________ is not a case hardening process? a. Carburising b. Nitriding c. Cyaniding d. Annealing
|
||||
6) High degree of toughness is a must for__________________? a. High speed steel b. Shock resisting steel c. Cold work tool steel d. None of these
|
||||
7) Which of the following is the easiest to bend ? a. Steel b. Stainless steel c. Cast iron d. Wrought iron
|
||||
8) Vessels made of _____________ can be used to store dry chlorine? a. Thermoplastic materials b. Nickel c. Steel or iron d. None of these
|
||||
9) Electronic structure of a material is generally studied by__________________? a. Metallurgical microscope b. Electron diffraction c. Spectroscopic techniques d. X-ray
|
||||
10) Dip stick used for measuring the level of petro fuels (e.g. petrol, diesel, fuel oil etc.) in the storage tank is usually made of_________________? a. Brass b. Copper c. High carbon steel d. Aluminium
|
||||
11) Gunmetal and bronze are not corroded by the action of__________________? a. Wet chlorine b. Synthetic detergent solution c. Hydrochloric acid (10%) d. Nitric acid (< 25%)
|
||||
12) Hydrochloric acid is _______________ corrosive to common metals? a. Least b. Not c. Mildly d. Highly
|
||||
13) Invar used in thermocouples is an alloy of nickel and________________? a. Iron b. Copper c. Chromium d. Lead
|
||||
14) Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making________________? a. Shafts b. Flanges c. Gears d. Shear blades
|
||||
15) Softness of silver can be converted into hardness by alloying it with small quantity of_________________? a. Copper & nickel b. Zinc c. Aluminium d. Tin
|
||||
16) A material capable of undergoing large permanent deformation, when subjected to compression is termed as___________________? a. Malleable b. Ductile c. Brittle d. None of these
|
||||
17) The behaviour of visco-elastic material is time dependent. This behaviour is common in _____________ materials? a. Non-crystalline solid b. Crystalline c. Rubbery d. Non-crystalline organic polymeric
|
||||
18) An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called____________________? a. Constantan b. Kanthal c. Chromel d. German silver
|
||||
19) Constantan is an alloy of____________________? a. Cu (55%) & Sn (45%) b. Cu (55%) & Ni (45%) c. Pt (95%) & Rh (10%) d. Fe (80%) & Ni (20%)
|
||||
20) Tempering of steel is done to make it________________? a. Brittle b. Hard c. Rollable d. Soft
|
||||
21) Which of the following has the highest compressive strength ? a. Wrought iron b. Cast iron c. Mild steel d. High carbon steel
|
||||
22) Purity of electrical grade aluminium should be ≥ _____________ percent? a. 95 b. 99.5 c. 85 d. 90
|
||||
23) The metals occuring at the lower most position in the electromotive series____________________? a. Do not resist corrosion b. Resist corrosion very strongly c. Are very brittle d. Are heat insulators
|
||||
24) Ability of a material to absorb energy in deformation in the plastic range is characterised as its____________________? a. Ductility b. Toughness c. Creep d. Resilience
|
||||
25) Austenitic manganese steel used for making jaws of crushing machines contains about ______________ percent manganese? a. 1.5-2 b. 3.5-4.5 c. 7-9 d. 12-14
|
||||
26) Chromel (Nichrome) is an alloy of_____________________? a. Chromium and molybdenum b. Nickel and chromium c. Molybdenum and nickel d. Chromium and aluminium
|
||||
27) Babbitt metal used for making bearings should have_____________________? a. High co-efficient of friction between journal and bearing b. Ability to retain lubricant on its surface c. Low co-efficient of friction between journal and bearing d. Both B. & C.
|
||||
28) Thermosetting resins are those polymers, which__________________? a. Do not increase in plasticity with rise in temperature b. Allow slip to occur between molecules c. Do not take on a permanent set d. None of these
|
||||
29) Pick the odd man out of the following? a. Calorising b. Pack carburising c. Nitriding d. Cyaniding
|
||||
30) A material no longer behaves elastically beyond_________________? a. Plastic limit b. Limiting load c. Elastic limit d. Breaking load
|