Mcq on Gas turbine power plant (objectives questions and answers). η T = 5200 x (1190 – 839) x 0.91 = 1.661 MJ/kg 3. A regenerative Gas turbine operate at steady state, the inlet to the compressor is at 100 KPA and 320 K. the pressure ratio is 9. the inlet to the turbine is 1100 K. the isentropic efficiency of the compressor and turbine is 75%. The turbine used in gas turbine power plant is larger than that used in steam power plants. Here are two turbines. By continuing, I agree that I am at least 13 years old and have read and agree to the. Now, the pressure ratio of the turbine is increased to 5, while maintaining the same inlet conditions. Turbine performance •The flow in a turbine is also assumed to be adiabatic, though in actual engines there could be turbine blade cooling. 4. Today we study of  multiple  choice questions (mcq) on f... Mcq on Gas Turbine (objectives questions and answers). In this mechanical engineering lecture today we learned about power  plant subjects. Curve 1-3 is actual compression process in gas turbine. The ratio of specific weighf/h.p. ⇒ The thermal efficiency of a gas turbine as compared to a diesel plant is same more less depends on other factors ⇒ Pick up the correct statement gas turbine uses low air-fuel ratio to economies on fuel gas turbine uses high air-fuel ratio to reduce outgoing temperature gas turbine uses low air-fuel ratio to develop the high thrust required Solution for A gas turbine power plant working on Brayton cycle as per the following specifications. 7. Jet propulsion and Rocket propulsion. In addition, the exergy efficiency of the overall system increases from 24.2% to 39.9% as the isentropic efficiencies of the turbines … Modern Combined Cycle Gas Turbine (CCGT) plants, in which the thermodynamic cycle of consists of two power plant cycles (e.g. Compressors, Gas Dynamics and Gas Turbines Online Test – Multiple Choice Questions and Answers 1. (11). The isentropic efficiency of the turbine is 85%. This test is Rated positive by 87% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. Which of the following is a types of gas turbine power plant ? Mcq Added by: Muhammad Bilal Khattak. Hello friends my name is Roshan Namdeo Waje and founder of mechstudy.here I shere the imforfation about mechanical engineering. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Which of the statements given above are correct? η T = 5200 x (1190 – 839) x 0.91 = 1.661 MJ/kg 124. ... A. compressor efficiency B. isentropic efficiency C. Euler’s efficiency D. pressure coefficient E. pressure ratio. β 2 = 90 o. A gas turbine works on which one of the following cycles? Comparison Between Disc Brake & Drum Brake, TOM, Mechanical Engineering, GATE, Syllabus - Mechanical Engineering : ME, GATE, What is Cams & Followers, TOM, Mechanical Engineering, GATE, Mechanical Properties of Engineering Materials. EmoticonEmoticon, A. The energy efficiency of the overall system changes from 26.6% to 34.1% as the isentropic efficiencies of the turbines varies from 50% to 90%. Consider the T-s diagram shown in thefollowing figure:Actual compression process in gasturbines is indicated by the process. Pressure and temperature of air at inlet to compressor = 1… 2. engines and gasturbines: 1. C 61 : 1 . The blade-to-gas speed ratio can be expressed in terms of the isentropic stage terminal velocity c 0 . The speed of rotation of the moving elements of gas turbines is muchhigher than those of steam turbines, 2. Ans: b. Compressors, Gas Turbines And Jet Engines MCQ question is the important chapter for a Mechanical Engineering and GATE students. C. Heat drop in the moving blades to the total heat drop in the fixed blades. Efficiency of gas turbine is increased by using..... A. Inter cooling . Isentropic efficiency of the steam turbine: The isentropic efficiency of an optimized steam turbine is 90% for an advanced power plant. 2. The given figure shows four plots A, B, C and D of thermal efficiency against pressure ratio: The curve which represents that of a gas turbine plant using Brayton cycle (without regeneration) is the one labelled. Reason (R): In a gas turbine plant, the maximum pressure and temperature arelow when compared to those of reciprocating IC engines. Efficiency of the feedwater pump: According to manufacturers informations, the overall efficiency of the feedwater pump can be 75-85% according to the size. B. Reheating . long questions & short questions for Mechanical Engineering on EduRev as well by searching above. Ans: e. 126. The pressure ratio in gas turbines is of the order of (a),2:l (b)4:1 (c) 61: 1 The isentropic efficiency of turbine can then be written as η T (h 2a - h 1)/(h 2s - h 1) where h 1 = enthalpy at the inlet h 2a = enthalpy of actual process at the exit h 2s = enthalpy of isentropic process at the exit : Isentropic Efficiency of Compressors and Pumps The ratio of isentropic work to euler’s work is known as _____? relationships for the turbine work, Eq. Almost any kind of fuel can be used with gas turbines. The overall isothermal efficiency of the compressor is defined as the ratio of The degree of reaction is defined as the ratio..... A. Maximum efficiency but very less specific work output, Maximum efficiency and very high specific work output, Minimum efficiency and very less specific work output, Minimum efficiency but very high specific work output ​. The heat losses are 15% of the calorific value. Supersonic flow leads to decrease in efficiency. The compressor is divided into low-pressure and high-pressure stages. Gas turbine mcq, mcqs on gas Turbine, multiple choice questions gas turbine turbine, ... Two constant pressure process and two isentropic process . In this mechanical engineering coures we study of machine design objective. Advantages and Disadvantages of closed cycle. Heat drop in the moving blades to the heat drop in the fixed blades. Conservatively, we took a value of 87% in our analyses. Mechanical efficiency of gas turbines as compared to I.C engines is (a) higher (b) lower (c) same (d) depends on on odier considerations (e) unpredictable. A 2 : 1 . Supersonic flow leads to decrease in flow rate.Which of the statements given above is/are correct? So additional work is needed to overcome the inefficiency of the compressor to produce a desired CPR. Isentropic efficiencies of both the HP and LP turbines, Thermal efficiency of the steam circuit; B) The compression ratio in the gas turbine cycle is 7.21 and the outlet gas temperature is 553 o C; assuming no pressure losses, calculate: isentropic efficiency of the compressor and turbine, the thermal efficiency of the gas turbine cycle. A Bell-Coleman air refrigeration cycle works as a reversed: Assertion (A): The thermal efficiency of Brayton cycle with regeneration decreases as the compressor ratio increases. Consider the following statements in respect of gas turbines: 1. Read More Section(Compressors, Gas Turbines and Jet Engines) Each Section contains maximum 70 questions. The pressure ratio is 25, compressor isentropic efficiency is 84%, and turbine isentropic efficiency is 86%. The compression ratio of a gas power plant cycle corresponding to maximum work output for the given temperature limits of Tmin and Tmax will be. Learn Compressors, Gas Turbines And Jet Engines MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. The operating characteristics of the turbine are modeled by developing a multiple regression curve fit for the turbine efficiency as function of non-dimensional speed and pressure ratio. of gas turbin and I.C engines may be typically of the order of (a) 1 : 1 (b) 2 : 1 (c) 4 : 1 (d) 1:2 (e) 1 : 6. The air mass flow rate is 22 kg/s, intake air is at 10°C and 100 kPa, and turbine inlet temperature is 1250°C. 2. Q23 A gas turbine power plant working on Brayton cycle as per the following specifications Pressure and temperature of air at inlet to compressor = 1 bar and 10°C Power output of the plant = 15 MW Temperature at inlet to the turbine = 780°C Pressure ratio = 12 Isentropic efficiency of compressor = 100% Isentropic efficiency of turbine = 97% Determine the following: 0 Pressure and temperatures at … The other is the light-weighted and compact a. •Isentropic efficiency of the turbine is defined in a manner similar to that of the compressor. 2.11. Which one of the thermodynamic cycles shown in the following figures represents that of Brayton cycle? The real work done by gas turbine in adiabatic process is then: W T,real = c p (T 3 – T 4s) . The turbine used in gas turbine power plants is smaller than that used in steam power plants. The air-fuel ratio in gas turbines is of the order of (a) 7 : 1 (b) 15 : 1 (c) 30 : 1 (d) 40 : 1 (e) 50: 1. The maximum temperature at the inlet to the turbine is 800°C. In the paper a calculation methodology of isentropic efficiency of a compressor and turbine in a gas turbine installation on the basis of polytropic efficiency characteristics is presented. Reason (R): The allowable maximum temperature at the turbine inlet is limited by available material considerations. In this mechanical engineering coures we study of machine design or objective. Ans: a; The ratio of specific weighf/h.p. Mechanical Engineering Fig. Ans: c. 125. Today, there exist two large markets for industrial gas turbines. ratio and high thermal efficiency has placed them at advantage over the heavy-duty gas turbine generators. The degree of reaction of a reaction turbine is the ratio of energytransfer in fixed blade to the overall energy transfer across a stage. Blade to gas speed ratio. Efficiency of the Brayton cycle is lower than the efficiency of the Otto cycle, for the same compression ratio c. Efficiency of the Brayton cycle is same as that of the Otto cycle, for the same compression ratio d. cannot say σ s = u 2 c 0 = [ 2 ( 1 + ϕ 2 cot ⁡ β 2 ) ] − 1 2. Methods to improve thermal efficiency. The efficiency factor is included to account for the actual performance of the compressor as opposed to the ideal, isentropic performance. 1. This contains 20 Multiple Choice Questions for Mechanical Engineering Gas Turbine - MCQ Test 1 (mcq) to study with solutions a complete question bank. GAS TURBINES Unit 3: Gas Turbines and Jet Propulsion: Classification of Gas Turbines, Analysis of open cycle gas turbine cycle. {\displaystyle \,\sigma _ {s}= {\frac {u_ {2}} {c_ {0}}}= [2 (1+\phi _ {2}\cot {\beta _ {2}})]^ {- {\frac {1} {2}}}} for. Ans: e 124. The thermal efficiency of a gas turbine as compared to a diesel plant is (a) same (b) more (c) less (d) depends on other factors (e) unpredictably. Though A and R are true, but R is not correct reason for A. It is compressed to 4 bar with an isentropic efficiency of 82%. Gas turbine plants are heavier and larger in size than steam turbineplants, 3. 5 shows the effect of the isentropic efficiencies of turbine 1 and turbine 2 on the overall system energy and exergy efficiency. A gas turbine cycle with heat exchanger and reheating improves, Both thermal efficiency and specific power output, Neither thermal efficiency nor specific power output ​. engines and not in gas turbines. D 9 : 1 . Assertion (A): Gas turbines use very high air fuel ratio. The power coefficient (cp)variation of a wind mill with the speed ratio is correctly shown by. This mock test of Gas Turbine - MCQ Test 1 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. Compressors, Gas Turbines and Jet Engines Compressors, Gas Turbines and Jet Engines. The real work done by gas turbine in adiabatic process is then: W T,real = c p (T 3 – T 4s) . Both A and R are individually true and R is the correct explanation of A, Both A and R are individually true but R is not the correct explanation of A. In this mechanical engineering coures today  we solve of thermodynamics objective. Isentropic compression of saturated vapour of all superheated vapour. Assertion (A): The thermal efficiency of gas turbine plants is higher compared todiesel plants. Assertion (A): The thermal efficiency of a gas turbine plant is low as compared tothat of reciprocating IC engines. 2. B. The work done by gas turbine in isentropic process is then: W T,s = c p (T 3 – T 4s) = 5200 x (1190 – 839) = 1.825 MJ/kg. The calorific value of the fuel used is 43.1 MJ/kg. 18. Consider the following statements pertaining to gas turbines: 1. The overall pressure drop in a turbine is the product of pressure dropper stage and number of stages. A steam plant has the boiler efficiency of 92%, turbine efficiency (mechanical) of 94%, generator efficiency of 95% and cycle efficiency of44%. Ch 8, Lesson C, Page 3 - Isentropic Efficiency of a Turbine. Which of the above statements is/are correct? For a Brayton cycle, match the following using codes given below: Use of maximum pressure ratio, corresponding to maximum to minimum cycle temperature ratio in case of Joule cycle gives which one of the following? . of gas turbin and I.C engines may be typically of the order of (a) 1 : 1 (b) 2 : 1 (c) 4 : 1 (d) 1:2 (e) 1 : 6. 3. The general form for the definition of efficiency of a turbocharging process is always based on the comparison of two ideal processes: • The isentropic compression of the working medium (air or mixture) from an initial state 1 to a final state 2 • The isentropic expansion of the exhaust gas from an initial state 3 to a final state 4. The same turbine can be used for  both plants. Compressors, Gas Turbines & Jet Engines MCQ with detailed explanation for interview, entrance and competitive exams. Heat drop in the fixed blades to the heat drop in the moving blades. Consider the following statements comparing I.C. A large single-cycle gas turbine typically produces for example 300 megawatts of electric power and has 35–40% thermal efficiency. In Rankine cycle the work output from the turbine is given by (a) change of internal energy between inlet and outlet The one on the right is a real, irreversible turbine and we would like to calculate its isentropic efficiency so we could compare its performance to the performance of another real turbine. Jan 13,2021 - Gas Turbine - MCQ Test 1 | 20 Questions MCQ Test has questions of Mechanical Engineering preparation. The solved questions answers in this Gas Turbine - MCQ Test 1 quiz give you a good mix of easy questions and tough questions. One for heavy-duty gas turbines designed for land-based applications found in large combined cycle power plants. The turbine on the left is an isentropic turbine. Ans: e Assume air as a perfect gas with specific heat ratio γ = 1.4 . Low grade fuel can't be burnt in gas turbine since it leads to poor life of turbine blades, etc. D. Two isothermal process and two constant volume process. Gas turbines are simple, compact and light in weight. students definitely take this Gas Turbine - MCQ Test 1 exercise for a better result in the exam. ConversionConversion View Answer Discuss. Mechanical efficiency of gas turbines as compared to I.C engines is (a) higher (b) lower (c) same (d) depends on on odier considerations (e) unpredictable. C.3 LP Compressor Isentropic Efficiency 138 C.4 HP Compressor Isentropic Efficiency 139 C.5 HP Turbine Isentropic Efficiency 140 C.6 LP Turbine Isentropic Efficiency 140 C.l Power Turbine Isentropic Efficiency 141 C.8 LP Compressor Capacity 141 C.9 HP Compressor Capacity 143 … Gas turbines require 'cooling water for its operations, 4. SJ J W K ( 1)/ 01 02 01 02 1 1 Ideal work of expansion for given pressure ratio Thus ideal gas equation can be rewritten asv/T = mR/p = constant Thus,T2/T1 = v2/v1 That is,T2/(27+273) = 2× v1/v1 T2=2×300T2= 600 k. 1234567891011121314. ... B Increase in thermal efficiency but decrease in net output . Gas turbine cycle (Brayton cycle) is not as efficient as Rankine cycle forsteam. The work done by gas turbine in isentropic process is then: W T,s = c p (T 3 – T 4s) = 5200 x (1190 – 839) = 1.825 MJ/kg. B 4 :1 . Efficiency of the Brayton cycle is higher than the efficiency of the Otto cycle, for the same compression ratio b. Thus the decrease in compressor isentropic efficiency with pressure ratio is observed as shown in Fig. Complete expansion of working substance is possible in I.C. In a gas turbine plant air enters the compressor at 1 bar and 7°C. You can find other Gas Turbine - MCQ Test 1 extra questions, (9), the isentropic temperature change, Eq. (10), and the definition of turbine isentropic efficiency, Eq. Two constant pressure process and two isentropic process, C. Two isobaric process and two isentropic process. In an ideal world, the value of the efficiency would be 1.0; in reality, it is always less than 1.0. 12. The pressure ratio in gas turbines is of the order of . There is flexibility in the design of different components of gas turbines as different processes take place in different components. Similarly, it can be shown that, for a turbine, the isentropic efficiency will increase with pressure ratio and this is due to the reheating of the gas entering the next turbine stage due to … 85%. Even low grade fuels can be burnt in gas turbines.Of these statements. Reason (R): The mechanical efficiency of gas turbines is higher compared to dieselengines. (a) two isentropic processes and two constant volume processes (b) two isentropic processes and two constant pressure processes (e) two isothermal processes and three constant pressure processes (d) none of the above. Ans: a 123. the Brayton cycle and the Rankine cycle), can achieve a thermal efficiency of around 55%. In this mechanical engineering lecture today we learned about power  plant subjects Mcq on Gas turbine (objectives questions and answers). Reason (R): As the   compression   ratio    of   compressor  increases, the   range    oftemperature in the regenerator decreases and the amount of heat recovered reduces. 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Compression ratio B coefficient E. pressure ratio of the compressor as opposed to the turbine is defined a! Very high air fuel ratio place in different components compared to dieselengines ( MCQ ) on f... on!