1.Why pistons are usually dished at top ? Ans: Pistons are usually hollowed at top…

1.Maximum combustion temperature in gas turbines is of the order of 1100 to 10°C whereas…

1.Which two elements in feed water can cause corrosion of tubes and plates in boiler…

1.When maximum discharge is obtained in nozzle ? Ans: At the critical pressure ratio. 2.Under…

1.What is the difference between scavenging and supercharging ? Ans: Scavenging is process of flushing…

1.What is the need of high compression ratio? Today every machine is expected to give…

1. What causes white smoke in two stroke locomotive engines? That is the engine running…

1. How pipe flanges are electrically insulated? Pipe flanges are protected from corrosion by means…

1. What is annealing? It is a process of heating a material above the re-crystallization…

1. Explain the second law of thermodynamics. The entropy of the universe increases over time…