The heat supplied is 52 kJ and adiabatic expansion ratio 32:1. A Carnot engine uses nitrogen as the working fluid (γ = 1.4). If the temperature of the high temperature reservoir is 727° C/ what is the temperature of low temperature reservoir? (a) 23☌ (b) -23☌ (c) 0☌ (d) 250☌ T Tmin 2.22 Ans. (c) Heat rejection rate = heat input rate - Electrical Energy outputģ6 × 108 kJ 36 ×10s − 400 MW = MW − 400 MW = 600 MW 3600 s 3600Ģ.22 A Carnot cycle is having an efficiency of 0.75. 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 (c)Ģ.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 81. 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 (η ) =1- 2 it only depends on reservoirs T1 temperature nothing else. Reason (R): Carnot cycle efficiency is independent of working substance. 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 285☌ and rejects 492 kW of heat at 5☌. 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) Q2 S. For a heat engine operating on the Carnot cycle, the work output is ¼ th of the heat transferred to the sink. As stirling cycle’s efficiency is equal to Carnot cycle.ħ3. 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. IC Engine Performances Engine Cooling Emission & Control 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 IC Engines Gas Power Cycles 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