Question No. 1 Explain Otto cycle. Answer: Otto cycle can be explained by a pressure volume relationship diagram. It shows the functioning cycle of a four stroke engine. The cycle starts with an intake stroke, closing the intake and moving to the compression stroke, starting of combustion, power stroke, heat exchange stroke where heat is…
Question No. 1 Difference between Boiling Point and Melting Point. Answer: (A) The melting point is a defined for solids when it transfers from solid state to liquid state. (B) The boiling point is defined for liquids for a state change from liquid to gas. (C) Boiling point is highly dependent on the external pressure…
Question No. 1 How engine design needs to be changed to burn lean mixture? Answer: Engine to burn lean mixture uses high compression ratio and the highly turbulent movement of the charge is produced by the geometry of the combustion chamber. Question No. 2 Horse power of I.C. engines can be expressed as RAC rating,…
Question No. 1 What happens if gasoline is used in a Diesel engine? Will diesel engine work? Answer: No, it will not work, as the Compression ratio of Petrol engine is 6 to 10 & that of Diesel engine is 15 to 22. Thus on such high compression, gasoline gets highly compressed & it may…
Question No. 1 What are two essential conditions of perfect gas? Answer: It satisfies equation of state and its specific heats are constant. Question No. 2 Enthalpy and entropy are functions of one single parameter. Which is that? Answer: Temperature. Question No. 3 What is DTSI Technology? Answer: DTSI stands for Digital Twin Spark Plug…
Question No. 1 What are two essential conditions of perfect gas? Answer: It satisfies equation of state and its specific heats are constant. Question No. 2 Enthalpy and entropy are functions of one single parameter. Which is that? Answer: Temperature. Question No. 3 What is DTSI Technology? Answer: DTSI stands for Digital Twin Spark Plug…
Question No. 1 State all the laws of Thermodynamics? Answer: Generally thermodynamics contains four laws; (A) Zeroth law: deals with thermal equilibrium and establishes a concept of temperature. (B) First law: throws light on concept of internal energy. (C) Second law: indicates the limit of converting heat into work and introduces the principle of increase of entropy. (D) Third law: defines the absolute…
Question No. 1 In which part of the steam turbine does stress corrosion cracking (SCC) occur? Answer: In the wet stages of the low-pressure turbine. Question No. 2 In which zone of steam turbines has temperature-creep rupture been observed? Answer: Damage due to creep is encountered in high temperature (exceeding 455°C) zones. That is, it…
Question No. 1 How is a fly-ball governor used with a hydraulic control? Answer: As the turbine speeds up, the weights are moved outward by centrifugal force, causing linkage to open a pilot valve that admits and releases oil on either side of a piston or on one side of a spring-loaded piston. The movement…
Question No. 1 Why an increase in area is required to produce an increase of velocity in case of supersonic flow? Answer: Increase in area for increase in velocity for supersonic flow is required because the density decreases faster than velocity increases at supersonic speeds and to maintain continuity of mass, area must increase. Question…