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.
7. The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be
9. In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that
Options
A. compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller.
B. maintaining vacuum on tube side is more difficult than that on the shell side.
C. water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.
D. condenser can act as a storage unit for condensed steam.
Correct Answer: water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.