![]() ![]() = 10 57 570work done per cycle J and work done per sec = 18J/s 36 WĨ2. If the amount of heat drawn per cycle is 57 J, then the output of the engine will be (a) 66W (b) 56W (c) 46 W (d) 36 W 48. A heat engine using lake water at 12oC as source and the surrounding atmosphere at 2 oC as sink executes 1080 cycles per min. (c) For maximum improvement in efficiency source temperature should be raised and sink temperature lowered. Which one of the following changes/sets of changes in the source and sink temperatures (T1 and T2 respectively) of a reversible engine will result in the maximum improvement in efficiency? (a) 1T T+ (b) 2T T (c) 1T T+ and 2T T (d) 1T T and 2T T ħ8. Q Q Q Q Q TW 293or 0.5T T T T T T W T T 879 293 (a) Least rate of heat rejection per kW net output = 2Qw In a heat engine operating in a cycle between a source temperature of 606C and a sink temperature of 20C, what will be the least rate of heat rejection per kW net output of the engine? (a) 0.50 kW (b) 0.667 kW (c) 1.5 kW (d) 0.0341 kWģ7. What is the amount of heat rejected? (a) 11 kJ (b) 13 kJ (c) 26 kJ (d) 28 kJ ģ7. The heat supplied is 52 kJ and adiabatic expansion ratio 32:1. A Carnot engine uses nitrogen as the working fluid ( = 1.4). If the temperature of the high temperature reservoir is 727 C/ what is the temperature of low temperature reservoir? (a) 23C (b) -23C (c) 0C (d) 250CĢ.22 Ans. = 2.22 A Carnot cycle is having an efficiency of 0.75. (c) Heat rejection rate = heat input rate - Electrical Energy output ![]() kJ/h of energy, the rate of rejection of heat from the power plant is (a) 200 MW (b) 400 MW (c) 600 MW (d) 800 MW 82. If the efficiency of the heat engine is 75%, the heat rejected per cycle is Ģ 1 1 2(a)16 kJ (b)33 kJ (c)37 kJ (d)66 kJ3 3 2 3ġ 2 22And W Q Q or Q 66.67 50 16 kJ3=Ĩ2. = 2.11 A cyclic heat engine does 50 kJ of work per cycle. The heat rejected is (a) 30 kW (b) 20 kW (c) 10 kW (d) 5 kW A heat engine working on Carnot cycle receives heat at the rate of 40 kW from a source at 1200 K and rejects it to a sink at 300 K. (a) efficiency of cannot cycle ( ) =1- 21 Reason (R): Carnot cycle efficiency is independent of working substance.Ĩ5. Engine A uses air as the working substance and B uses steam as the working substance. Assertion (A): Two engines A and B work on the Carnot cycle. Irreversible cycle Which of these cycles could possible be executed by the engine? (a) 1 alone (b) 3 alone (c) 1 and 2 (d) None of 1, 2 and 3 33. Consider the following thermodynamic cycles in this regard: 1. A heat engine receives 1000 kW of heat at a constant temperature of 285C and rejects 492 kW of heat at 5C. If heat received by the engine is 2000 kJ/minute the work output will be, nearly, (a) 9.98 (b) 10.39 (c) 11.54 (d) 10.95 15. The data given in the table refers to an engine based on Carnot cycle, where Q1 = Heat received (kJ/min), Q2 = Heat rejected (kJ/s), W = Work output (kW) For a heat engine operating on the Carnot cycle, the work output is th of the heat transferred to the sink. As stirling cycles efficiency is equal to Carnot cycle. Which one of the following cycles has the highest thermal efficiency for given maximum and minimum cycle temperatures? (a) Brayton cycle (b) Otto cycle (c) Diesel cycle (d) Stirling cycle 36. Jet Propulsion Turbo-jet Basic cycle for turbo-jet engine Thrust, thrust power, propulsive efficiency and thermal efficiency Turbo-prop Ram-jet Pulse-jet engine Rocket engines Requirements of an ideal rocket propellant Applications of rockets Thrust work, propulsive work and propulsive efficiency Supercharging of SI Engine Supercharging of CI Engine Effect of supercharging on performance of the engine Superchargers Turbo charging Supercharging Objectives of supercharging ![]() SI and CI Engines Ignition limits Stages of combustion in SI engine Detonation or knocking SI engine combustion chamber designs Combustion in the CI engine Air-fuel ratio in CI engines Delay period or ignition lag Diesel knock Methods of controlling diesel knock (reducing delay period) The CI engine combustion chambers Comparison of SI and CI EnginesĬarburetion and Fuel Injection A simple or elementary carburettor Complete carburettor Aircraft carburettor Petrol injection Requirements of a diesel injection system Fuel pump Spray formation Injection timingįuels Fuels for spark-ignition engines Knock rating of SI engine fuels Octane number requirement (ONR) Diesel fuels Cetane Number Fuels for gas turbines and jet engines ![]() Carnot cycle Stirling cycle Ericsson cycle Lenoir cycle The constant volume or Otto cycle The diesel cycle The dual or mixed or limited pressure cycle Atkinson cycle Joule or Brayton cycle Comparison of Otto, diesel, and dual (limited-pressure) cycles ![]()
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