Points of arrest for iron correspond to__________________?

A. Stages at which allotropic forms change
B. Stages at which further heating does not increase temperature for some time
C. Stages at which properties do not change with increase in temperature
D. There is nothing like points of arrest

The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00°C will _________________?

A. Increase
B. Decrease
C. Remain same
D. First increase and then decrease

Isotropic materials are those which have the same ____________________?

A. Elastic properties in all directions
B. Stresses induced in all directions
C. Thermal properties in all directions
D. Electric and magnetic properties in all directions

The ability of a material to resist softening at high temperature is known as____________________?

A. Creep
B. Hot tempering
C. Hot hardness
D. Fatigue

Stress relaxation is- the phenomenon ___________________?

A. In which parts are not loaded
B. In which stress remains constant on in-creasing load
C. In which deformation tends to loosen the joint and produces a stress reduced
D. Stress reduces on increasing load

Mild steel belongs to the following category___________________?

A. Low carbon steel
B. Medium carbon steel
C. High carbon steel
D. Alloy steel

With increase in engine speed, the ignition of spark in petrol engine has to be __________________?

A. Unaltered
B. Increased
C. Decreased
D. Advanced

Malleability of a material can be defined as ______________________?

A. Ability to undergo large permanent deformations in compression
B. Ability to recover its original form
C. Ability to undergo large permanent deformations in tension
D. All of the above

The theoretically correct mixture of air and petrol is approximately ________________?

A. 0.334027778
B. 0.500694444
C. 0.625694444
D. 0.834027778

Carburretion is done to________________?

A. Feed petrol into cylinder
B. Govern the engine
C. Break up and mix the petrol with air
D. Heat up the charge to cylinder