Homework Answers
Option 'b' is false. The statement 'Gas engines are basically diesel engines with different injectors' is false.
- We know that, gas engines has lower compression ratio than diesel engines. Hence, option a is true.
- We know that, gas engines uses an ignition module and the spark plug. Injectors are not used in gas engines. Hence, option b is false and option c is true.
- We also know that, self ignition temperature of natural gas is more than diesel. Hence, natural gas requires more heat than diesel fuel to ignite. Hence, option d is true.
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Regarding gas engine combustion, which of the following statements is FALSE? Choose the best answer. Gas...
Which of the following is NOT included in the four-stroke cycle of a diesel engine? Choose...
Which of the following is NOT included in the four-stroke cycle of a diesel engine? Choose the best answer. Intake Combustion Exhaust Spark Regarding gas engine combustion, which of the following statements is FALSE? Choose the best answer. Gas engines have a lower compression ratio than diesel engines Gas engines are basically diesel engines with different injectors Gas engines use an ignition module and spark plug Natural gas requires more heat than diesel fuel to ignite
Which statement relates to diesel combustion? Choose the best answer Diesel fuel requires a spark plug...
Which statement relates to diesel combustion? Choose the best answer Diesel fuel requires a spark plug to ignite Diesel combustion and gas combustion are the same All statements relate to diesel combustion Compressed air gets hot enough to ignite diesel fuel
Diesel engines are fundamentally different from Otto engines because (choose one answer): a. They are more...
Diesel engines are fundamentally different from Otto engines because (choose one answer): a. They are more powerful and sturdy. b. They have four strokes and not two. c. Use compression to ignite the fuel not a spark plug. d. Operate at lower temperatures. Group of answer choices
1. A 12-cylinder, 4-stroke automobile engine is being designed. What type of cylinder arrangement would you...
1. A 12-cylinder, 4-stroke automobile engine is being designed. What type of cylinder arrangement would you recommend? (a) In-Line (b) V-Type (c) W-Type (d) Rotary. 2. The expression "cylinder cut-out" means : (a) Half of cylinder volumes is used. (b) Half of cylinder numbers is used. (c) Half of cylinder masses is used. (d) None of the above. 3. Adding lubrication oil to the inlet fuel- air mixture in 2-st engines will increase: (a) HC emissions. (b) CO emissions (c)...
A complete cycle of a four-stroke engine requires the crankshaft to rotate 360 degrees. Choose the...
A complete cycle of a four-stroke engine requires the crankshaft to rotate 360 degrees. Choose the best answer True False Which of the following is NOT included in the four-stroke cycle of a diesel engine? Choose the best answer Intake Combustion Exhaust Spark
How do engines transfer combustion into useable energy? Choose the best answer. Using heat from compressed...
How do engines transfer combustion into useable energy? Choose the best answer. Using heat from compressed air to ignite the air-fuel mixture By having several cylinders ignite in sequence By the piston moving up and down in a four-stroke cycle By converting reciprocating motion into rotary motion
An Otto engine is operating with natural gas which can be approximated as an ideal gas....
An Otto engine is operating with natural gas which can be approximated as an ideal gas. Assuming the engine is at standard condition (25°C, 1 atm) before the compression process. Also, temperature of the Otto cycle after the combustion process is 1500 K. (a) Assuming compression ratio of the Otto engine as 8, 9 and 10, determine the corresponding temperatures of the natural gas-air mixture (natural gas with 100% excess air) after the compression. (b) Determine the thermal energy release...
Diesel fuel combustion propagates as OA diffusion flame A premixed flame O both diffusion and premixed flame O neither diffusion nor premixed flame When comparing Dl and IDI diesel engines, the IDI d...
Diesel fuel combustion propagates as OA diffusion flame A premixed flame O both diffusion and premixed flame O neither diffusion nor premixed flame When comparing Dl and IDI diesel engines, the IDI diesel has O lower injection pressure and higher thermal losses O higher injection pressure and lower thermal losses O higher injection pressure and higher thermal losses O lower injection pressure and lower thermal losses The potential advantages and challenges of HCCl over more traditional combustion strategies are O...
A spark ignition engine works with an Otto cycle that has the following characteristics: Q =...
A spark ignition engine works with an Otto cycle that has the following characteristics: Q = 42000 kJ / kg, P1=90kPa, T1 = 30 ° C, and rc=8. It is desired to increase the power of the motor by increasing the work indicated using a fuel with a higher calorific value or by varying the compression ratio. a) What is the indicated work increase if the compression ratio is increased from 8 to 10? b) How much should the heat...
A gasoline engine has a compression ratio of 8.00 and uses a gas for which y...
A gasoline engine has a compression ratio of 8.00 and uses a gas for which y = 1.40. (a) What is the efficiency of the engine if it operates in an idealized Otto cycle? 0 % (b) If the actual efficiency is 15.0%, what fraction of the fuel is wasted as a result of friction and energy losses by heat that could by avoided in a reversible engine? (Assume complete combustion of the air-fuel mixture.) %
Which of the following is NOT included in the four-stroke cycle of a diesel engine? Choose the best answer. Intake Combustion Exhaust Spark Regarding gas engine combustion, which of the following statements is FALSE? Choose the best answer. Gas engines have a lower compression ratio than diesel engines Gas engines are basically diesel engines with different injectors Gas engines use an ignition module and spark plug Natural gas requires more heat than diesel fuel to ignite
Which statement relates to diesel combustion? Choose the best answer Diesel fuel requires a spark plug to ignite Diesel combustion and gas combustion are the same All statements relate to diesel combustion Compressed air gets hot enough to ignite diesel fuel
1. A 12-cylinder, 4-stroke automobile engine is being designed. What type of cylinder arrangement would you recommend? (a) In-Line (b) V-Type (c) W-Type (d) Rotary. 2. The expression "cylinder cut-out" means : (a) Half of cylinder volumes is used. (b) Half of cylinder numbers is used. (c) Half of cylinder masses is used. (d) None of the above. 3. Adding lubrication oil to the inlet fuel- air mixture in 2-st engines will increase: (a) HC emissions. (b) CO emissions (c)...
A complete cycle of a four-stroke engine requires the crankshaft to rotate 360 degrees. Choose the best answer True False Which of the following is NOT included in the four-stroke cycle of a diesel engine? Choose the best answer Intake Combustion Exhaust Spark
How do engines transfer combustion into useable energy? Choose the best answer. Using heat from compressed air to ignite the air-fuel mixture By having several cylinders ignite in sequence By the piston moving up and down in a four-stroke cycle By converting reciprocating motion into rotary motion
Diesel fuel combustion propagates as OA diffusion flame A premixed flame O both diffusion and premixed flame O neither diffusion nor premixed flame When comparing Dl and IDI diesel engines, the IDI diesel has O lower injection pressure and higher thermal losses O higher injection pressure and lower thermal losses O higher injection pressure and higher thermal losses O lower injection pressure and lower thermal losses The potential advantages and challenges of HCCl over more traditional combustion strategies are O...
A gasoline engine has a compression ratio of 8.00 and uses a gas for which y = 1.40. (a) What is the efficiency of the engine if it operates in an idealized Otto cycle? 0 % (b) If the actual efficiency is 15.0%, what fraction of the fuel is wasted as a result of friction and energy losses by heat that could by avoided in a reversible engine? (Assume complete combustion of the air-fuel mixture.) %
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