A.To improve thermal efficiency
B.To clean the surfaces by carrying away the carbon and metal particles cansed by wear
C.To reduce noise
D.To reduce vibrations
E.None of the above
A.2 metres
B.4 metres
C.6 metres
D.8 metres
A.axial compression and tension
B.bending stress and axial compression
C.shear stress and axial compression
D.bending stress, shear stress and axial compression
A.in cse of normal activity
B.in case of critical activityonly
C.in case of sub-critical activity only
D.in case of super-critical activity only
A.Cobalt, chromium and tungsten
B.Cobalt, vanadium and nickel
C.Nickel, copper and zinc
D.Nickel, zinc and aluminium
E.Copper, tin and lead
A.Retain compression
B.Lubricate cylinder walls
C.Maintain vacuum
D.Reduce vacuum
E.Reduce piston wear
A.30?C
B.45?C
C.60?C
D.90?C
A.Reducing the COP of the cycle
B.Increase the COP of the cycle
C.Reduce the refrigerating effect
D.Increase the super heat of vapour
E.None of the above
A.Created at the beginning of suction stroke
B.Created at the end of suction stroke
C.Created during combustion
D.Created towards the end of compression stroke
E.None of the above
A.control is good but limits need to be re-established
B.the sampling plan needs revision
C.A cheaper and less precise machine might be used
D.control is excellent and no action is needed
