The decibel is
A.Unit of noise level
B.A logarithmic ratio between a measured quantity and a reference quantity
C.Quantity of noise per unit area
D.A logarithmic ratio between a measured quantity and 100
E.None of the above
Category: Production Engineering Mcqs
With electronic circuits the accuracy that can be expected from scanners will lie in the range of
A.0.1 to 1%
B.5 to 10%
C.10 to 17.5%
D.20 to 25%
E.25 to 50%
The hardness of martensite in quenched plain carbon steels reaches almost a saturation value of carbon of about
A.0.20%
B.0.40%
C.0.60%
D.1.40%
E.None of the above
For mild steel work piece using carbide tool, the temperature at which maximum materials is removed is
A.Below room temperature
B.Near zero deg centigrade
C.100?C
D.200?C
E.275?C
Which one of the following is used for thermocouple junctions?
A.Elinvar
B.Manganin
C.Nichrome
D.Muntz metal
E.Duralumin
The type of grains usually preferred for moulding sand are
A.Round
B.Hemishperical
C.Cylindrical
D.Cubical
E.Sharp irregular shaped
Brass is
A.Copper-zinc alloy
B.Copper-tin alloy
C.Copper-lead alloy
D.Copper-nickel alloy
E.Copper aluminium alloy
Grey iron is usually welded by
A.Arc welding
B.Gas welding
C.TIG welding
D.MIG welding
E.Resistance welding
Necking is
A.Machining a groove around cylindrical shaft
B.Drilling a hole in a plate
C.Hole drilled for riveting
D.Preparation of surface for brazing
E.Initial spot welding to position jobs
A stick is
A.Automatic moulding tool
B.A device for measuring moisture content in foundry sand
C.A hand tool for repairing mould in foundry shop
D.A tool for mostening the sand
E.A tool for lifting the pattern from mould
