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Q. What are the thermal power cycles used? A. Two types that are steam powerplants working on rankine cycle and gas power plants working on brayton cycles, Otto cycle, diesel cycle etc Q. What is the most pertinent cycle in thermal power plant? A. Brayton cycle Q. What are the types of boilers used? A. Two types namely fire in tube (like Cochran) and water in tube (like Babcock and Wilcox) Q. What part of rankine cycle expands the fluid? A. Turbine Q. What kind of turbine is used in thermal powerplant? A. Reaction(Francis) [should've said parson's 50% reaction turbine instead as Francis is used in hydel] Q. What is modulus of rigidity? A. E/I (Wrong but that's what I remembered!), he corrected me saying Radius of curvature is also integral part of it Q. What is slenderness ratio and if it is low, will it have more load on the beam? A. If it's low, it would become a thick column and will experience more crushing load and less buckle, so beam would experience more load Q. What is crushing force if beam is hinged at one end and free at other? A. It will be pi square by effective length square multiplied by EI. The effective length will be twice the length of the beam Q. Is Gibbs energy high or low near the defects? A. Since the defect region has more stresses involved, so there will be high energy Q. If two loads are applied on the material on both ends, what will happen to the defects/dislocations? A. The dislocations will move and will get removed from the material and the energy will also reduce with it (something like that but elaborated a little more!) Q. What is the difference between adiabatic and isenthalpic and which of them would be ideal for a powerplant? A. Adiabatic means heat can't be exchanged across the system boundary but isenthalpic means the system is isolated and the process is reversible along with adiabatic, so it's ideal case Q. What is the highest temperature range in a reheat cycle? (Got a little nervous!) A. Couldn't tell the exact values as couldn't recall [it's around 400 to 500 degree C] Q. What is the difference between supercritical cycle and subcooled cycle? A. Couldn't tell correctly [in supercritical, boiler works in the region above critical point where liquid directly changes to gas] Q. Is there a difference from the usual cycle used in steam power plant compared to the ideal rankine cycle? A. I replied but he guided me by asking whether all of the energy will be used after getting out of furnace. I said there will be certain losses and he then expanded telling it be in the form of radiation, convection, conduction and through flue gases
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Post Graduate Engineer Trainee

Interviewed at Tata Consulting Engineers

3.5★
Aug 21, 2023

Q. What are the thermal power cycles used? A. Two types that are steam powerplants working on rankine cycle and gas power plants working on brayton cycles, Otto cycle, diesel cycle etc Q. What is the most pertinent cycle in thermal power plant? A. Brayton cycle Q. What are the types of boilers used? A. Two types namely fire in tube (like Cochran) and water in tube (like Babcock and Wilcox) Q. What part of rankine cycle expands the fluid? A. Turbine Q. What kind of turbine is used in thermal powerplant? A. Reaction(Francis) [should've said parson's 50% reaction turbine instead as Francis is used in hydel] Q. What is modulus of rigidity? A. E/I (Wrong but that's what I remembered!), he corrected me saying Radius of curvature is also integral part of it Q. What is slenderness ratio and if it is low, will it have more load on the beam? A. If it's low, it would become a thick column and will experience more crushing load and less buckle, so beam would experience more load Q. What is crushing force if beam is hinged at one end and free at other? A. It will be pi square by effective length square multiplied by EI. The effective length will be twice the length of the beam Q. Is Gibbs energy high or low near the defects? A. Since the defect region has more stresses involved, so there will be high energy Q. If two loads are applied on the material on both ends, what will happen to the defects/dislocations? A. The dislocations will move and will get removed from the material and the energy will also reduce with it (something like that but elaborated a little more!) Q. What is the difference between adiabatic and isenthalpic and which of them would be ideal for a powerplant? A. Adiabatic means heat can't be exchanged across the system boundary but isenthalpic means the system is isolated and the process is reversible along with adiabatic, so it's ideal case Q. What is the highest temperature range in a reheat cycle? (Got a little nervous!) A. Couldn't tell the exact values as couldn't recall [it's around 400 to 500 degree C] Q. What is the difference between supercritical cycle and subcooled cycle? A. Couldn't tell correctly [in supercritical, boiler works in the region above critical point where liquid directly changes to gas] Q. Is there a difference from the usual cycle used in steam power plant compared to the ideal rankine cycle? A. I replied but he guided me by asking whether all of the energy will be used after getting out of furnace. I said there will be certain losses and he then expanded telling it be in the form of radiation, convection, conduction and through flue gases

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