Home / Online Test / Power Systems Objective Questions & Answers – Set 21 Online Test Power Systems Objective Questions & Answers – Set 21 S Bharadwaj ReddyLeave a comment Power Systems Objective Questions & Answers 0% Mercury is choice with steam in binary vapor cycle because all of above. higher saturation temperature than other fluids. relative low vaporization pressure. higher critical temperature and pressure. Correct! Wrong! - Continue >> In Rankine cycle, the work output from a turbine is given by change of entropy between inlet and outlet. change in temperature between inlet and outlet. change in internal energy between inlet and outlet. change of enthalpy between inlet and outlet Correct! Wrong! - Continue >> The steam power plant efficiency can be improved by using high temperature and high pressure steam. burning large amount of coal. decreasing the load on the plant. using large quantity of water. Correct! Wrong! - Continue >> Gas turbine power plants for maximum efficient may have Reheating. Multistage compression. Heat exchangers. All of above. Correct! Wrong! - Continue >> Which of following power plants is free from environmental problem Hydroelectric Diesel engine. Steam Nuclear Correct! Wrong! - Continue >> Which of the following plants has the maximum capital cost Steam plants. Nuclear plants. Hydro-plants. Diesel plants. Correct! Wrong! - Continue >> Pipes carrying steam are generally of cobalt aluminium cast iron. steel Correct! Wrong! - Continue >> Carnot cycle comprises of none of above. two isentropic process and two constant pressure process. two isothermal process and two constant pressure process. two isentropic process and two constant volume process. Correct! Wrong! - Continue >> Binary vapor cycle are used for improving the condenser performance. all of the above. improving the plant efficiency. increasing the turbine efficiency. Correct! Wrong! - Continue >> Which of the following contributes to the Rankine cycle efficiency improvement in a thermal power plant Use of steam for heating of boiler feed water. All of the above. Use of high pressure. Reheat of steam an intermediate stages. Correct! Wrong! - Continue >> Maximum efficiency of modern coal fired steam raising thermal power plants is restricted to about 035 (a low value), mainly because of high energy loss in boiler. low alternative efficiency. high energy loss from turbine exhaust to condenser. low steam turbine mechanical efficiency. Correct! Wrong! - Continue >> Deaerative heating is done to heat the feed water. remove dissolved gases in water. remove dissolved. heat the steam. Correct! Wrong! - Continue >> The overall efficiency of a steam power plant equal to product of boiler efficiency, turbine efficiency and generator efficiency. regenerative cycle. the Rankine cycle. binary vapor cycle. Correct! Wrong! - Continue >> In a thermal power plants, pressure in the working fluid cycle is developed by superheater feed water pump. turbine condenser Correct! Wrong! - Continue >> Reheat cycle in thermal power plant is used to improve condenser performance. reduce loss of heat. increase thermal efficiency. utilize heat of flue gases. Correct! Wrong! - Continue >> In a steam power plant, the feed water coming to the economizer is heated plant the feed water coming to the economizer is heated using LP steam. direct heat in the furnace. HP steam. flue gas. Correct! Wrong! - Continue >> The modern trend in electric power generation to have large size thermal plants near load centre. to have large size thermal plant located near coal fields. none of above. to have large number of small size thermal plants located at different places. Correct! Wrong! - Continue >> Rankine cycle efficiency of a steam power plant is of 45 - 80 %. 30 - 45 %. 20 - 30 %. 60 - 80 %. Correct! Wrong! - Continue >> Operating cost of thermal power station is less than that of diesel power plant. less than that of nuclear power plant. is the same as that of nuclear power plant. less than that of hydroelectric power plant. Correct! Wrong! - Continue >> In a regenerative cycle, feed water is heated by all of above. heaters exhaust gas. drained steam from turbine. Correct! Wrong! - Continue >> Share the quiz to show your results ! Facebook Facebook Just tell us who you are to view your results ! Show my results >> Power Systems - 21 I got %%score%% of %%total%% right Share your results Facebook Facebook Twitter Google+ ↺ PLAY AGAIN ! 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