Question Set 84
1.Which reactor has no moderator ? Ans: Fast breeder reactor. 2.What are thermal neutrons ? Ans: Thermal neutrons are slow neutrons (having energy below 1 eV) which are in thermal…
Question Set 83
1.How you can define coal ? Ans: Coal is a naturally occurring hydrocarbon that consists of the fossilised remains of buried plant debris that have undergone progressive physical and chemical…
Question Set 82
1.Why rockets using liquid hydrogen have higher specific impulse compared to liquid hydrocarbon ? Ans: Liquid hydrogen has higher burning velocity. 2.Why axial flow compressor is preferred for gas turbines…
Question Set 81
1.Why pistons are usually dished at top ? Ans: Pistons are usually hollowed at top to (i) provide greater spa’e for combustion, (ii) increase surface for flue gases to act…
Question Set 80
1.Maximum combustion temperature in gas turbines is of the order of 1100 to 10°C whereas same is around 00°C in I.C. engine ? Why ? Ans: High temperature in I.C.…
Question Set 79
1.Which two elements in feed water can cause corrosion of tubes and plates in boiler ? Ans: Acid and oxygen in feed water lead to corrosion. 2.What should be done…
Question Set 78
1.When maximum discharge is obtained in nozzle ? Ans: At the critical pressure ratio. 2.Under what condition the work done in reciprocating compressor will be least ? Ans: It is…
Question Set 77
1.What is the difference between scavenging and supercharging ? Ans: Scavenging is process of flushing out burnt gases from engine cylinder by introducing fresh air in the cylinder before exhaust…
Question Set 76
1.What is the need of high compression ratio? Today every machine is expected to give higher efficiency. When we talk about petrol engine and diesel engine whose thermal efficiency is…
Question Set 75
1. What causes white smoke in two stroke locomotive engines? That is the engine running too lean (lack of fuel). This condition will lead to overheating and failure of the…
