Water in lubricating oil aids in
A.Decomposition
B.Oxidation
C.Formation of solution
D.Dilution
E.Burning
Category: Mechanical Engineering Mcqs
A turbo-charger is used
A.In gas turbines for compression of air
B.For supercharging reciprocating engine
C.In jet propulsion units
D.In rockets for producing air fuel mixture
E.None of the above
Excess oil consumption in engine may be due to
A.Leakage of oil through oil pan gasket
B.Poor quality or improper viscosity of engine oil
C.Excessive oil pressure
D.Badly worn piston rings
E.Any of the above
Gated patterns are normally used for
A.mass production of small castings
B.production of castings which do not require machining
C.castings having several hollow spaces
D.castings for light metals
The contraction allowance for magnesium is around
A.1 mm/metre
B.5 mm/metre
C.14 mm/metre
D.25 mm/metre
The pressure of air in case of pneumatic tools is generally in the range
A.4 to 6 kg/cm2
B.14 to 16 kg/cm2
C.24 to 26 kg/cm2
D.34 to 36 kg/cm2
A uniform beam of effective length L, fixed at one end and loaded uniformly will have maximum deflection at
A.7/8 L from fixed end
B.3/8 L from free end
C.5/8 L from free end
D.At free end
A 20 number crucible
A.Will have capacity to melt 20 kg of copper
B.Will have internal diameter of 20 cm
C.Will have height of 20 cm
D.Can take 20 cc of molten material
E.Can produce castings of 20 kg only
