Question Set 55
Question No. 1 What maybe the possible causes for the safety trip to trip at normal speed? Answer: 1. Excessive vibration. 2. Leakage in the pilot valve. 3. Deposition of dirt in the…
Question Set 54
Question No. 1 What is combined-cycle cogeneration? Answer: A combined cycle using a gas turbine or diesel, usually driving a generator in which the exhaust gases are directed to a…
Question Set 53
Question No. 1 What factors are responsible for turbine-blade failures? Answer: In the high pressure cylinder, the turbine blades are mostly affected by: 1. Solid-particle erosion (SPE) 2. High cycle fatigue Whereas,…
Question Set 52
Question No. 1 What are the losses in steam turbines? Answer: 1. Residual Velocity Loss - This is equal to the absolute velocity of the steam at the blade exit. 2. Loss due…
Question Set 51
Question No. 1 Usually it has been found that SCC attack takes place particularly at key-ways of shrunk-on-disc rotors of low-pressure turbines. Why are key-ways prone to SCC attack? Answer:…
Question Set 50
Question No. 1 In which turbine is velocity compounding utilized? Answer: In the Curtis turbine. Question No. 2 In which zone of steam turbines has temperature-creep rupture been observed? Answer:…
Question Set 49
Question No. 1 How would you stop air from leaking into a condenser? Answer: First, find the leak by passing a flame over the suspected part while the condenser is…
Question Set 48
Question No. 1 How is pressure compounding accomplished? Answer: 1. This is accomplished by an arrangement with alternate rows of nozzles and moving blades. 2. Steam enters the 1st row of nozzles…
Question Set 47
Question No. 1 How can problems of "excessive vibration or noise" due to piping strain be avoided on steam turbines? Answer: 1. The inlet as well as exhaust steam lines should…
Question Set 46
Question No. 1 In which turbine tip leakage is a problem? Answer: Tip leakage is a problem in reaction turbines. Here, each vane forms a nozzle; steam must flow through…
