During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to____________________?
(A) Time
(B) Square root of time
(C) Square of time
(D) Cube of time
Property responsible for the talcum powder to cling to the skin is the__________________?
(A) Capillary action
(B) Adhesion
(C) Cohesion
(D) Surface tension
Breakeven point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost________________?
(A) Only
(B) Plus variable cost
(C) Plus overhead cost
(D) Plus selling expenses
Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are ?
(A) Cobalt, chromium & tungsten
(B) Cobalt, chromium & nickel
(C) Molybdenum, tungsten & chromium
(D) Cobalt, zirconium & molybdenum
Which of the, following is not associated with the functioning of a petrol engine ?
(A) Compression ignition system
(B) Spark plug
(C) Carburettor
(D) Otto cycle
Heating of ferromagnetic materials to a temperature above Curie temperature makes it ________________________?
(A) Insulator for heat & electricity transmission
(B) Ferritic
(C) Behave like paramagnetic materials
(D) Superconductor
Oxygen cylinders used for autogenous (cutting/welding) purposes are ___________________?
(A) Seamless & made of steel
(B) Heat treated before use
(C) Made by sand casting
(D) Welded steel cylinders
Bad odour in sanitary latrines is reduced by periodically sprinkling_____________________?
(A) Bleaching powder
(B) Lime powder
(C) Aluminium sulphate
(D) None of these
_______________ test determines the yield strength, Young’s modulus of elasticity, percentage reduction in area & percentage elongation of a material ?
(A) Tensile
(B) Fatigue
(C) Impact
(D) None of these
Material of construction of foundry crucible is _________________?
(A) Lead
(B) Stainless steel
(C) Graphite
(D) Cast iron