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.Management Sciences
Category: Materials and Construction
_______________ is a donor impurity for semi-conductors ?
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A. Boron
B. Antimony
C. Gallium
D. None of these
The material of construction of pressure mills used for squeezing out the juice from sugar cane is__________________?
A. Stainless steel
B. Cast iron
C. Mild steel
D. Monel
Heavy duty bearings are usually made of___________________?
A. White metal
B. Phosphorous bronze
C. Monel
D. Zinc
Most suitable material of construction for the storage of concentrated nitric acid is__________________?
A. Cast iron
B. Monel
C. Karbate
D. Aluminium or chromium alloys (Cr > 18% for cold acid)
Which of the following is not an alloy of tin ?
A. White-bearing metal
B. Pewter type metal
C. Soft solder
D. German silver
Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and_________________?
A. Moving mercury and graphite
B. Graphite and moving mercury
C. Moving mercury and carbon
D. Moving mercury and crimped steel wire
Softness of silver can be converted into hardness by alloying it with small quantity of_________________?
A. Copper & nickel
B. Zinc
C. Aluminium
D. Tin
Mixing vessel used for the chlorination of methane to produce methyl chloride is made of___________________?
A. Copper
B. Cast iron
C. Aluminium
D. High carbon steel
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.
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