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
(D) none of the above
With increase in engine speed, the ignition of spark in petrol engine has to be __________________?
(A) Unaltered
(B) Increased
(C) Decreased
(D) Advanced
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
(D) scavenge the cylinder
The theoretically correct mixture of air and petrol is approximately ________________?
(A) 0.334027778
(B) 0.500694444
(C) 0.625694444
(D) 0.834027778
The following type of carburettor is preferred_______________?
(A) concentric type
(B) eccentric type
(C) horizontal type
(D) vertical type
(D) none of the above
The unique property of cast iron is its high ___________________?
(A) malleability
(B) ductility
(C) surface finish
(D) damping characteristics
(D) hardness
The percentage of carbon in grey iron castings usually varies between __________________?
(A) 0.5 to 1%
(B) 1 – 2%
(C) 2.5 to 4.5%
(D) 5 – 7%
(D) 7-9%.
For the allotropic forms of iron, the points of arrest are __________________?
(A) the points where no further change oc-curs
(B) constant for all metals
(C) the points where there is no further flow of metal
(D) the points of discontinuity
(D) the points where major changes take place
The crystal of alpha iron is ____________________?
(A) body centred cubic
(B) face centred cubic
(C) hexagonal close packed
(D) cubic structure
(D) orthorhombic crystal
A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?
(A) molecular change
(B) physical change
(C) allotropic change
(D) solidus change
(D) atomic change