Warped castings may be produced due to
A.poor collapsibility of cores
B.non-provision of camber allowance on the pattern
C.weak flasks
D.any of the above
Category: Mechanical Engineering Mcqs
In an isothermal atmosphere
A.Pressure decreases linearly with elevation
B.Pressure is constant all over
C.Pressure varies in the same way as density
D.Pressure increases directly as the square of height
E.Pressure varies exponentially with density
Which emission has generally least proportion from a diesel engine as compared to a petrol engine?
A.Oxides of nitrogen
B.Hydrocarbons
C.Carbon monoxide
D.All of the above
A framed structure is perfect if it contains members equal to
A.n – 3
B.n – 2
C.2n – 1
D.2n – 2
E.2n – 3
Shot peening
A.Improves fatigue life of small parts
B.Causes metal surface to be in tension and the layer beneath in compression
C.Changes the crystalline structure of material
D.Refines the grain structure
E.Is done at recrystallization temperature
The ignition of the charge in spark ignition engine before spark occurs in spark plug, is known as
A.auto-ignition
B.pre-ignition
C.detonation
D.none of the above
If you want to stop the car in the shortest distance on an icy road, you should
A.push hard the brakes to lock the wheels
B.push just hard enough to prevent slipping
C.pump’ the brakes
D.not apply the brakes
when atoms are hold together by the sharing of valence electrons
A.They form a covalent bond
B.The valence electrons are free to move away from the atom
C.Each shared electron leaves a hole
D.Each atom becomes free to move
E.None of the above
Under Gantt incentive plan the wages are calculated on
A.piece basis
B.group average basis
C.hourly basis
D.None of the above
Plastic are
A.Good conductors of heat and bad conductors of electricity
B.Bad conductors of heat and good conductors of electricity
C.Good conductors of heat as well as electricity
D.Bad conductors of heat as well as electricity
E.Semi-conductors
