A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material ?
(A) Steel
(B) Glass
(C) Rubber
(D) Brass
The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased ___________________ times ?
(A) Two
(B) Four
(C) Six
(D) Eight
In TIG welding, thoriated tungsten electrodes are used, because it ____________________?
(A) Has higher current carrying capacity
(B) Has better electron emissivity
(C) Is stronger than ordinary tungsten
(D) Is easy to prepare
In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet ?
(A) Zirconia
(B) Alumina
(C) Bakelite
(D) Tungsten carbide
For separating small pieces of metal from engine oil of a car, the best separating technique is the _____________________ ?
(A) Chromatography
(B) Evaporation
(C) Filtration
(D) Fractional distillation
Out of the following, which will fracture most readity, when hit with a hard hammer ?
(A) Brass
(B) Bronze
(C) German silver
(D) Cast iron
__________________ stress cannot be sustained by a fluid in equilibrium ?
(A) Shear
(B) Tensile
(C) Compressive
(D) None of these
Oxyacetylene reducing flame is used while carrying out welding on___________________?
(A) Alloy steel
(B) Grey cast iron
(C) Mild steel
(D) High carbon steel
For a spontaneous natural process at constant temperature and pressure, the free energy of the system always____________________?
(A) Increases
(B) Decreases
(C) Remain constant
(D) Increases to a maximum before decreasing
To improve the machinability of steel, it is generally subjected to _____________________?
(A) Spheroidising
(B) Tempering
(C) Normalising
(D) Annealing