1.
Which one of the following is incombustible ?
H2
CCl4
C2H2
S
2.
The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.
hard
soft
silicon carbide
aluminium oxide
3.
Tin based white metals are used, where bearings are subjected to
high pressure & load.
low pressure & load.
high temperature.
large surface wear.
4.
Friction factor for fluid flow in pipe does not depend upon the
pipe length.
pipe roughness.
fluid density & viscosity.
mass flow rate of fluid.
5.
All of the following alloying elements of steel increases hardness but sacrifice ductility, except
nickel
vanadium
molybdenum
chromium