During burning of grain boundaries
A.regions enriched in carbon are formed in first state of burning
B.non-oxidized cavities and blow holes are formed during second stage
C.iron oxide inclusions are formed in third stage
D.All of the above
Category: Mechanical Engineering Mcqs
The horse power required to move a belt conveyor increases as
A.conveyor speed
B.load increases
C.angle of inclination increases
D.all of the above
Temporary hardness of water is caused by
A.Bicarbonates of calcium and magnesium
B.Sulphates of calcium and magnesium
C.Chlorides of calcium and magnesium
D.Nitrates of calcium and magnesium
E.None of the above
The standard sulphur point temperature is
A.100?C
B.212?C
C.444.60?C
D.666.80?C
E.999.99?C
The solidification shrinkage of carbon steel is around
A.0.1 to 0.2 percent
B.0.5 to 1 percent
C.2 to 4 percent
D.8 to 10 percent
A material capable of absorbing large amounts of energy is known as
A.Ductile
B.Shock proof
C.Resilient
D.Hard
E.Tough
Air consumption of a four-stroke diesel engine per rated BHP/hr will be
A.1 kg
B.5 – 7 kg
C.10 – 14 kg
D.15 kg
E.20 kg
Which one is different from the others in press work operations?
A.Coining
B.Sizing
C.Flattening
D.Riveting
E.Punching
Maximum acceleration in above problem is
A.4?2/9 m/s2
B.3?2 m/s2
C.2?2/3 m/s2
D.?2/s m/s2
The process in which steel is heated 20? to 40?C below the lower critical temperature, held there for a prolonged period and then allowed to cool slowly in the furnace is known as
A.Normalising
B.Annealing
C.Spheroidising
D.Tempering
E.Austempering
