What is the ratio of the useful heat extracted to heating value?  A. Combustion efficiency  B. Phase efficiency  C. Heat efficiency  D. Work efficiency

What is the ratio of the useful heat extracted to heating value?  A. Combustion efficiency  B. Phase efficiency  C. Heat efficiency  D. Work efficiency
by

1 Answer

Answer :

Combustion efficiency
by

Related questions

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle  A. combustion is at constant volume  B. expansion and compression are isentropic  C. maximum temperature is higher  D. heat rejection is lower

Description : Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle  A. combustion is at constant volume  B. expansion and compression are isentropic  C. maximum temperature is higher  D. heat rejection is lower

Last Answer : Answer: D

What is defined as the ratio of the net electrical power output to the rate of fuel energy input?  A. Combustion efficiency  B. Thermal efficiency  C. Overall efficiency  D. Furnace efficiency

Description : What is defined as the ratio of the net electrical power output to the rate of fuel energy input?  A. Combustion efficiency  B. Thermal efficiency  C. Overall efficiency  D. Furnace efficiency

Last Answer : Overall efficiency

The efficiency of a dual combustion cycle __________ upon cut-off ratio.  A. depends  B. does not depend

Description : The efficiency of a dual combustion cycle __________ upon cut-off ratio.  A. depends  B. does not depend

Last Answer : Answer: A

The amount of heat energy per kilogram that must be added or removed when a substance changes from one phase to another.  a. specific heat  b. heat of expansion  c. latent heat  d. useful heat

Description : The amount of heat energy per kilogram that must be added or removed when a substance changes from one phase to another.  a. specific heat  b. heat of expansion  c. latent heat  d. useful heat

Last Answer : latent heat

Thermal efficiency is the ratio of:  A. Network input to total heat input  B. Network output to total heat output  C. Network output to total heat input  D. Network input to total heat output

Description : Thermal efficiency is the ratio of:  A. Network input to total heat input  B. Network output to total heat output  C. Network output to total heat input  D. Network input to total heat output

Last Answer : Network output to total heat input

For same compression ratio and for same heat added  (a) Otto cycle is more efficient than Diesel cycle  (b) Diesel cycle is more efficient than Otto cycle  (c) efficiency depends on other factors  (d) both Otto and Diesel cycles are equally efficient  (e) none of the above.

Description : For same compression ratio and for same heat added  (a) Otto cycle is more efficient than Diesel cycle  (b) Diesel cycle is more efficient than Otto cycle  (c) efficiency depends on other factors  (d) both Otto and Diesel cycles are equally efficient  (e) none of the above.

Last Answer : Answer : a

Heat engine deriving its power from the energy liberated by the explosion of a mixture of some hydrocarbon, in a gaseous or vaporized form.  a. Dual Combustion Engine  b. Internal Combustion Engine  c. External Combustion Engine  d. None of the above

Description : Heat engine deriving its power from the energy liberated by the explosion of a mixture of some hydrocarbon, in a gaseous or vaporized form.  a. Dual Combustion Engine  b. Internal Combustion Engine  c. External Combustion Engine  d. None of the above

Last Answer : Internal Combustion Engine

The efficiency and work ratio of a simple gas turbine cycle are  A.low  B.very low  C.high  D.very high

Description : The efficiency and work ratio of a simple gas turbine cycle are  A.low  B.very low  C.high  D.very high

Last Answer : Answer: B

What is the measure of the energy that is no longer available to perform useful work within the current environment?  a. enthalpy  b. entropy  c. internal energy  d. latent heat

Description : What is the measure of the energy that is no longer available to perform useful work within the current environment?  a. enthalpy  b. entropy  c. internal energy  d. latent heat

Last Answer : entropy

Utilizing the answer to the previous problem, estimate the overall or average increase in temperature ( ΔT) of the concrete roof from the energy absorbed from the sun during a12hour day. Assume that all of the radiation absorbed goes into heating the roof. The specific heat of concrete is about 900 J/kg, and the density is about 2,300 kg/m3 .  a. 7.9 °C  b. 8.9°C  c. 9.9°C  d. 10.9°C formula: ΔQ = m c ΔT

Description : Utilizing the answer to the previous problem, estimate the overall or average increase in temperature ( ΔT) of the concrete roof from the energy absorbed from the sun during a12hour day. Assume that all of the radiation absorbed goes into ... °C  b. 8.9°C  c. 9.9°C  d. 10.9°C formula: ΔQ = m c ΔT

Last Answer : 7.9 °C

For heat engine operating between two temperatures (T1>T2), what is the maximum efficiency attainable?  A. Eff = 1 – (T2/T1)  B. Eff = 1 - (T1/T2)  C. Eff = T1 - T2  D. Eff = 1 - (T2/T1)^2

Description : For heat engine operating between two temperatures (T1>T2), what is the maximum efficiency attainable?  A. Eff = 1 – (T2/T1)  B. Eff = 1 - (T1/T2)  C. Eff = T1 - T2  D. Eff = 1 - (T2/T1)^2

Last Answer : Eff = 1 – (T2/T1)

What is the highest efficiency of heat engine operating between the two thermal energy reservoirs at temperature limits?  A. Ericson efficiency  B. Otto efficiency  C. Carnot efficiency  D. Stirling efficiency

Description : What is the highest efficiency of heat engine operating between the two thermal energy reservoirs at temperature limits?  A. Ericson efficiency  B. Otto efficiency  C. Carnot efficiency  D. Stirling efficiency

Last Answer : Carnot efficiency

What refers to the amount of heat removed from the cooled space in BTS’s for 1 watt-hour of electricity consumed?  A. Cost efficiency rating  B. Energy efficiency rating  C. Coefficient of performance  D. Cost of performance

Description : What refers to the amount of heat removed from the cooled space in BTS’s for 1 watt-hour of electricity consumed?  A. Cost efficiency rating  B. Energy efficiency rating  C. Coefficient of performance  D. Cost of performance

Last Answer : Energy efficiency rating

Which of the following represents the perpetual motion of the first kind  (a) engine with 100% thermal efficiency  (b) a fully reversible engine  (c) transfer of heat energy from low temperature source to high temperature source  (d) a machine that continuously creates its own energy  (e) production of energy by temperature differential in sea water at different levels.

Description : Which of the following represents the perpetual motion of the first kind  (a) engine with 100% thermal efficiency  (b) a fully reversible engine  (c) transfer of heat energy from low ... its own energy  (e) production of energy by temperature differential in sea water at different levels.

Last Answer : Answer : d

Which one is the correct relation between energy efficiency ratio (EER) and coefficient of performance (COP)?  A. EER = 2.34 COP  B. EER = 3.24 COP  C. EER = 3.42 COP  D. EER = 4.23 COP

Description : Which one is the correct relation between energy efficiency ratio (EER) and coefficient of performance (COP)?  A. EER = 2.34 COP  B. EER = 3.24 COP  C. EER = 3.42 COP  D. EER = 4.23 COP

Last Answer : EER = 3.42 COP

The efficiency of Diesel cycle depends upon  A. temperature limits  B. pressure ratio  C. compression ratio  D. cut-off ratio and compression ratio

Description : The efficiency of Diesel cycle depends upon  A. temperature limits  B. pressure ratio  C. compression ratio  D. cut-off ratio and compression ratio

Last Answer : Answer: D

When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.  A. zero  B. 1/5  C. 4/5  D. 1

Description : When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.  A. zero  B. 1/5  C. 4/5  D. 1

Last Answer : Answer: A

The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will  (a) increase  (b) decrease  (c) remain unchanged  (d) increase/decrease depending on ap-plication  (e) unpredictable. “

Description : The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will  (a) increase  (b) decrease  (c) remain unchanged  (d) increase/decrease depending on ap-plication  (e) unpredictable. “

Last Answer : Answer : b

Is a general name, without specific meaning unless the way in which it is measured or define by the context.  a. Natural Value  b. Heating Value  c. Burning Value  d. Internal Value

Description : Is a general name, without specific meaning unless the way in which it is measured or define by the context.  a. Natural Value  b. Heating Value  c. Burning Value  d. Internal Value

Last Answer : Heating Value

Temperature of a gas is produced due to  (a) its heating value  (b) kinetic energy of molecules  (c) repulsion of molecules  (d) attraction of molecules  (e) surface tension of molecules.

Description : Temperature of a gas is produced due to  (a) its heating value  (b) kinetic energy of molecules  (c) repulsion of molecules  (d) attraction of molecules  (e) surface tension of molecules.

Last Answer : Answer : b

The coefficient of performance (COP) is the ratio between the:  A. Power consumption in watts and heat absorbed per hour  B. Heat absorbed per hour and the power consumption in watts  C. Work required and the absorbed heat  D. Absorbed heat and work required

Description : The coefficient of performance (COP) is the ratio between the:  A. Power consumption in watts and heat absorbed per hour  B. Heat absorbed per hour and the power consumption in watts  C. Work required and the absorbed heat  D. Absorbed heat and work required

Last Answer : Absorbed heat and work required

Which of the following events is heat exchange involved?  a. when there is a phase change  b. when there is a chemical reaction  c. when the gas expands adiabatically  d. when there is difference in temperature

Description : Which of the following events is heat exchange involved?  a. when there is a phase change  b. when there is a chemical reaction  c. when the gas expands adiabatically  d. when there is difference in temperature

Last Answer : when the gas expands adiabatically

Heat that cause change in phase without a change in temperature.  a) Sensible Heat  b) Latent Heat  c) Thermo Heat  d) None of the above

Description : Heat that cause change in phase without a change in temperature.  a) Sensible Heat  b) Latent Heat  c) Thermo Heat  d) None of the above

Last Answer : Latent Heat

Heat that cause change in temperature at without a change in phase.  a) Sensible Heat  b) Latent Heat  c) Thermo Heat  d) None of the above

Description : Heat that cause change in temperature at without a change in phase.  a) Sensible Heat  b) Latent Heat  c) Thermo Heat  d) None of the above

Last Answer : Sensible Heat

What refers to the amount of energy absorbed or released during a phase-change process?  A. Molar heat  B. Latent heat  C. Vaporization heat  D. Condensation heat

Description : What refers to the amount of energy absorbed or released during a phase-change process?  A. Molar heat  B. Latent heat  C. Vaporization heat  D. Condensation heat

Last Answer : Latent heat

Which of the following best describes both Stirling and Ericson engines?  a. Internal combustion engine  b. External combustion engine  c. Diesel cycle  d. Rankine cycle

Description : Which of the following best describes both Stirling and Ericson engines?  a. Internal combustion engine  b. External combustion engine  c. Diesel cycle  d. Rankine cycle

Last Answer : External combustion engine

What refers to the minimum temperature at which combustion can be sustained?  A. Burn temperature  B. Kindle temperature  C. Spark temperature  D. Ignition temperature

Description : What refers to the minimum temperature at which combustion can be sustained?  A. Burn temperature  B. Kindle temperature  C. Spark temperature  D. Ignition temperature

Last Answer : Ignition temperature

Producer gas is obtained by  A. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast  B. carbonisation of bituminous coal  C. passing steam over incandescent coke  D. passing air and a large amount of steam over waste coal at about 650°C

Description : Producer gas is obtained by  A. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast  B. carbonisation of bituminous coal  C. passing steam over incandescent coke  D. passing air and a large amount of steam over waste coal at about 650°C

Last Answer : Answer: A

Producer gas is obtained by  A. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast  B. carbonisation of bituminous coal  C. passing steam over incandescent coke  D. passing air and a large amount of steam over waste coal at about 650°C

Description : Producer gas is obtained by  A. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast  B. carbonisation of bituminous coal  C. passing steam over incandescent coke  D. passing air and a large amount of steam over waste coal at about 650°C

Last Answer : Answer: A

The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes.  A. Agree  B. Disagree

Description : The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes.  A. Agree  B. Disagree

Last Answer : Answer: A

_________ is a thermodynamic potential that measures the “useful” or process-initiating work obtainable from an isothermal, isobaric thermodynamic system.  a. Du-Pont Potential  b. Gibbs free energy  c. Rabz-Eccles Energy  d. Claussius Energy

Description : _________ is a thermodynamic potential that measures the “useful” or process-initiating work obtainable from an isothermal, isobaric thermodynamic system.  a. Du-Pont Potential  b. Gibbs free energy  c. Rabz-Eccles Energy  d. Claussius Energy

Last Answer : Gibbs free energy

Two thick slices of bread, when completely oxidized by the body, can supply 200,000 cal of heat. How much work is this equivalent to?  a) 4,190,000 joules  b) 8,390,000 joules  c) 839,000 joules  d) 419 000 joules Formula: J =Work/Heat J = mechanical equivalent of heat whose value is 4.19 joules/calorie

Description : Two thick slices of bread, when completely oxidized by the body, can supply 200,000 cal of heat. How much work is this equivalent to?  a) 4,190,000 joules  b) 8,390,000 joules  c) 839, ... d) 419 000 joules Formula: J =Work/Heat J = mechanical equivalent of heat whose value is 4.19 joules/calorie

Last Answer : 419 000 joules

How many joules of work is the equivalent of 15000 cal of heat?  a) 62850 joules  b) 3579.95 joules  c) 14995.81 joules  d) 15004.19 joules Formula: J =Work/Heat J = mechanical equivalent of heat whose value is 4.19 joules/calorie

Description : How many joules of work is the equivalent of 15000 cal of heat?  a) 62850 joules  b) 3579.95 joules  c) 14995.81 joules  d) 15004.19 joules Formula: J =Work/Heat J = mechanical equivalent of heat whose value is 4.19 joules/calorie

Last Answer : 62850 joules

The value for the ΔU of a system is -120 J. If the system is known to have absorbed 420 J of heat, how much work was done?  a. -540 J  b. -640 J  c. -740 J  d. -840 J formula: ΔU = q +w

Description : The value for the ΔU of a system is -120 J. If the system is known to have absorbed 420 J of heat, how much work was done?  a. -540 J  b. -640 J  c. -740 J  d. -840 J formula: ΔU = q +w

Last Answer : -540 J

Is a steady flow process at total constant pressure through a control volume for which there is no heat?  a. Adiabatic Saturation Process  b. Dew point  c. Adiabatic Ratio  d. None of the above

Description : Is a steady flow process at total constant pressure through a control volume for which there is no heat?  a. Adiabatic Saturation Process  b. Dew point  c. Adiabatic Ratio  d. None of the above

Last Answer : Adiabatic Saturation Process

The ratio of the weight of a substance to the weight of some standard substance is called?  a. Specific Heat  b. Specific Gravity  c. Isothermal  d. Specific Weight

Description : The ratio of the weight of a substance to the weight of some standard substance is called?  a. Specific Heat  b. Specific Gravity  c. Isothermal  d. Specific Weight

Last Answer : Specific Gravity

Specific heat ratio is always  a. > 1  b. < 1  c. = 1  d. none of the above

Description : Specific heat ratio is always  a. > 1  b. < 1  c. = 1  d. none of the above

Last Answer : > 1

The ratio of the change in energy in the form of the heat  a. relative density  b. specific heat  c. specific gravity  d. none of the above

Description : The ratio of the change in energy in the form of the heat  a. relative density  b. specific heat  c. specific gravity  d. none of the above

Last Answer : specific heat

The ratio of specific heat at constant pressure (Cp) and specific heat at constant volume (cv) is  A. equal to one  B. less than one  C. greater than one  D. none of these

Description : The ratio of specific heat at constant pressure (Cp) and specific heat at constant volume (cv) is  A. equal to one  B. less than one  C. greater than one  D. none of these

Last Answer : Answer: C

Universal gas constant is defined as equal to product of the molecular weight of the gas and  (a) specific heat at constant pressure  (b) specific heat at constant volume  (c) ratio of two specific heats  (d) gas constant  (e) unity.

Description : Universal gas constant is defined as equal to product of the molecular weight of the gas and  (a) specific heat at constant pressure  (b) specific heat at constant volume  (c) ratio of two specific heats  (d) gas constant  (e) unity.

Last Answer : Answer : d

The index of compression n tends to reach ratio of specific heats y when  (a) flow is uniform and steady  (b) process is isentropic  (c) process is isothermal  (d) process is isentropic and specific heat does not change with temperature  (e) process is isentropic and specific heat changes with temperature.

Description : The index of compression n tends to reach ratio of specific heats y when  (a) flow is uniform and steady  (b) process is isentropic  (c) process is isothermal  (d) process ... specific heat does not change with temperature  (e) process is isentropic and specific heat changes with temperature.

Last Answer : Answer : d

Adiabatic heating and Adiabatic cooling really means _________ and _________ respectively.  a. raising the temp and lowering the temp  b. maintaining the pressure and changing the temperature  c. decreasing the volume and increasing the pressure  d. lowering the temp and raising the temp

Description : Adiabatic heating and Adiabatic cooling really means _________ and _________ respectively.  a. raising the temp and lowering the temp  b. maintaining the pressure and changing the temperature  c. decreasing the volume and increasing the pressure  d. lowering the temp and raising the temp

Last Answer : raising the temp and lowering the temp

What refers to the heating of the earth’s atmosphere not caused by direct sunlight but by infrared light radiated by the surface and absorbed mainly by atmospheric carbon dioxide?  A. Greenhouse effect  B. Global warming  C. Thermal rise effect  D. Ozone effect

Description : What refers to the heating of the earth’s atmosphere not caused by direct sunlight but by infrared light radiated by the surface and absorbed mainly by atmospheric carbon dioxide?  A. Greenhouse effect  B. Global warming  C. Thermal rise effect  D. Ozone effect

Last Answer : Greenhouse effect

The heating and expanding of a gas is called thermodynamic system.  A. Yes  B. No

Description : The heating and expanding of a gas is called thermodynamic system.  A. Yes  B. No

Last Answer : Answer: B

Which of the following gas is mostly used in town for street and domestic lighting and heating?  A. Producer gas  B. Coal gas  C. Mond gas  D. Coke oven gas

Description : Which of the following gas is mostly used in town for street and domestic lighting and heating?  A. Producer gas  B. Coal gas  C. Mond gas  D. Coke oven gas

Last Answer : Answer: B

Carbonisation of coal consists of  A. drying and crushing the coal to a fine powder  B. moulding the finely ground coal under pressure with or without a binding material  C. heating the wood with a limited supply of air to temperature not less than 280°C  D. none of the above

Description : Carbonisation of coal consists of  A. drying and crushing the coal to a fine powder  B. moulding the finely ground coal under pressure with or without a binding material  C. heating the wood with a limited supply of air to temperature not less than 280°C  D. none of the above

Last Answer : Answer: D

A simple steam engine receives steam from the boiler at 180˚C and exhausts directly into the air at 100˚C. What is the upper limit of its efficiency?  a. 11.28 %  b. 36.77 %  c. 20.36 %  d. 17.66 %

Description : A simple steam engine receives steam from the boiler at 180˚C and exhausts directly into the air at 100˚C. What is the upper limit of its efficiency?  a. 11.28 %  b. 36.77 %  c. 20.36 %  d. 17.66 %

Last Answer : 17.66 %

Liquid fuels have lower efficiency than solid fuels.  A. True  B. False

Description : Liquid fuels have lower efficiency than solid fuels.  A. True  B. False

Last Answer : Answer: B

The efficiency of Joule cycle is  A. greater than Carnot cycle  B. less than Carnot cycle  C. equal to Carnot cycle  D. none of these

Description : The efficiency of Joule cycle is  A. greater than Carnot cycle  B. less than Carnot cycle  C. equal to Carnot cycle  D. none of these

Last Answer : Answer: B

The efficiency of Diesel cycle increases with  A. decrease in cut-off  B. increase in cut-off  C. constant cut-off  D. none of these

Description : The efficiency of Diesel cycle increases with  A. decrease in cut-off  B. increase in cut-off  C. constant cut-off  D. none of these

Last Answer : Answer: A