Invar used in thermocouples is an alloy of nickel and________________?
A. Iron
B. Copper
C. Chromium
D. Lead
Materials and Construction
Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making________________?
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
A material capable of undergoing large permanent deformation, when subjected to compression is termed as___________________?
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
The behaviour of visco-elastic material is time dependent. This behaviour is common in _____________ materials?
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
An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called____________________?
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
Constantan is an alloy of____________________?
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%)
Tempering of steel is done to make it________________?
Tempering of steel is done to make it________________?
A. Brittle
B. Hard
C. Rollable
D. Soft
Which of the following has the highest compressive strength ?
Which of the following has the highest compressive strength ?
A. Wrought iron
B. Cast iron
C. Mild steel
D. High carbon steel
Purity of electrical grade aluminium should be ≥ _____________ percent?
Purity of electrical grade aluminium should be ≥ _____________ percent?
A. 95
B. 99.5
C. 85
D. 90
The metals occuring at the lower most position in the electromotive series____________________?
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