The knocking in S.I. engines is characterised by sudden auto-ignition of the change
A.nearest to the spark plug
B.farthest away from the spark plug
C.in the middle from the spark plug
D.none of the above
Category: Engineeeing Mcqs
Our weight will be zero under all of the following conditions EXCEPT
A.When we are ascending in a lift with acceleration of 4.9 m/s2
B.When we are freely faling
C.We are orbiting in a satellite
D.We are at the centre of the earth
The theory of failure generally applied in case of brittle materials is
A.Maximum shear stress theory
B.Maximum principal stress theory
C.Maximum strain energy theory
D.Maximum shear strain energy theory
E.Theory of superposition
Which one of the following reactions is not an exothermic
A.Absorption of sulphur troixide by 98.5% sulphuric acid
B.Oxidation of sulphur trioxide
C.Oxidation of sulphur to sulphur dioxide
D.Thermal dissociation of iron pyrites
Under which condition a material ordinatily said to be ductile undergoes a fracture similar to that of a brittle material
A.Cyclic loading at normal temperature
B.Long time static loading at elevated temperature
C.Impact loading specially at low temperatures
D.All of the above
E.None of the above
In which case value engineering may not be relevant?
A.Shopping plaza
B.Gas turbine blade ring
C.Electric fan
D.Automobile
In a centrifugal pump the pressure energy of water is increased because of
A.Rotation of impeller
B.Centrifugal force
C.Momentum of particles
D.Lift of particles
E.None of the above
The valve is opened as the cam lobe on the cam raises the
A.Valve lifter
B.Bearing
C.Piston pin
D.Valve guide
E.Valve seat
The size of the engine intake valve is
A.Same as that of exhaust valve
B.Smaller than that of exhaust valve
C.Large than that of exhaust valve
D.Does not depends upon the size of the exhaust valve
E.Depends upon the temperature of ambient air.
The purpose of surge tank in a pipe line is to
A.Smoothen the flow of water
B.Minimise friction losses in pipe
C.Prevent occurrence of hydraulic jump
D.To relieve the pressure due to water hammer
E.To maintain the flow of water under emergency conditions
