A soldering iron is used mainly to
A.Heat the metal
B.Melt the solder
C.Heat the flux
D.None of these
Category: Mechanical Engineering Mcqs
Which statement is not true for green sand moulding?
A.Moulds are cheapest
B.Preparation of moulds is less time consuming
C.Defect free and castings with good surface is obtained
D.none of the above
In pack-carburising carbon is supplied
A.Through gas
B.In the form of graphite
C.In the form of charcoal
D.In the form of hydrocarbons
E.In the form of calcium carbide
The expected life of a wheeled tractor is nearly
A.1 year
B.2 to 3 years
C.5 to 6 years
D.8 to 10 years
Which of the following materials demonstrate viscoelastic behaviour?
A.Rubber
B.Glass
C.Plastics
D.Non-crystalline organic polymers
E.All of the above
Temporary hardness in water in caused by salts like
A.Sulphates
B.Nitrates
C.Chlorides
D.Carbonates
E.All of the above
Which of the following metal can be cast in plaster moulds?
A.Yellow brass
B.Manganese
C.Aluminium bronzes
D.All of the above
The condition of refrigerant before and after the expansion or throttle valve in a vapour compression system is
A.Wet vapour, very wet vapour
B.Wet vapour, dry vapour
C.High pressure saturated liquid, very wet vapour
D.Very wet vapour, high pressure, saturated liquid
E.None of the above
