In case of locomotion, the coefficient of adhesion is highest when
A.the rails are dry
B.the rails are oiled
C.the rails are wet
D.the rails are dusty
Category: Mechanical Engineering Mcqs
The centre of buoyancy is
A.The point of intersection of the buoyant force and the centre line of the body
B.Centre of gravity of the body
C.Centroid of displaced volume of fluid
D.Mid-point between C.G. and metacentre
Critical speed of turbine is
A.Same as maximum operating speed
B.Same as run away speed
C.The speed at which shaft will break
D.The speed at which the number of natural vibrations or natural frequency equals the number of revolutions per minute
E.The speed equal to synchronous speed of generator
Simple indexing using a dividing head of turn ratio 40 for 6 division would be
A.14 holes in 21 hole circle plate
B.6 turns
C.26 holes in 21 hole circle plate
D.6 turns and holes in 21 hole circle plate
E.6 turns and 14 holes in 30 hole circle plate
Expediting is watching
A.flow of material
B.worker’s activity
C.minimizing delay
D.none of the above
In case of thin walled cylinders the ratio of hoop stress to maximum shear stress stress is
A.2
C.4
E.None of the above
Nationalization means
A.Taking over, by the government, of existing privately run concerns
B.Establishing new enterprises as state run concerns
C.Putting the day-to-day control of firms in the hands of Parliament
D.Instituting worker in control of an industry
E.The state assuming control of an industry to secure greater efficiency
The permissible level of HCN in drinking water is
A.Less than 0.01 mg/litre
B.Around 1 mg/litre
C.Around 5 mg/litre
D.Between 10 to 20 mg/litre
E.More than 50 mg/litre
During heat treatment, deformation and volume changes can be minimised by
A.slowly cooling in the martensitic range
B.using surface hardening when possible
C.using alloy steels least prone to such changes
D.Any of the above
Capillary action is due to the
A.Viscosity of liquid
B.Cohesion of liquid particles
C.Surface tension
D.Adhesion of liquid particles on the surface
E.None of the above
