Related Questions

The bypass factor (B.P.F.) in case of sensible heating of air is (Where td1 = Dry bulb temperature of air entering the heating coil, td2 = Dry bulb temperature of air leaving the heating coil and td3 = Dry bulb temperature of heating coil)
Match the following  (a) a non-metal that exists in two forms (i) Chlorine (b) a non-metal which is liquid at room temperature   (ii) Zinc (c) a metal which is constituent of brass and bronze (iii) Carbon (d) a non-metal used for disinfecting water (iv) Bromine (e) a metal used in electroplating (v) Copper
Assertion (A): Chills are used to reduce shrinkage porosity. Reason (R): the function of chill is to increase the rate of solidification in a critical region.
Consider the figures of a metal ball and a metal ring given below.
The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal is heated
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