a 12V zener diode is connected in series with a resistance of 150 ohms and a load resistance of 1kiloohms is connected across the zener diode. The maximum zener current should not exceed 20mA and the minimum current is nearly zero . Calculate the operating range of the input voltage

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

What part of the ear is names after tools, such as the hammer and the anvil?