IC Engines & Power Plants interview questions

1. A.fuel energy input per unit of electrical output in kJ/kWh, around 8,500 for a supercritical coal unit and above 10,000 for an old subcritical unit
2. B.spontaneous auto-ignition of the end gas ahead of the flame front in a petrol engine, producing pressure waves heard as knock
3. C.a diesel fuel's ignition quality expressed as shortness of ignition delay, with higher values giving smoother combustion
4. D.ratio of total cylinder volume at BDC to clearance volume at TDC, about 8–12 for petrol and 16–22 for diesel engines

Answer + AI explanation with Pro

1. A.Brake specific fuel consumption
2. B.Heat rate
3. C.Compression ratio
4. D.Cetane number

Answer + AI explanation with Pro

1. A.Compression ratio — hypothetical constant pressure that would produce the cycle's net work over one power stroke, used to compare engines of different sizes
2. B.Compression ratio — steam is reheated between the high- and low-pressure turbines to raise efficiency and keep exhaust dryness above about 88%
3. C.Compression ratio — spontaneous auto-ignition of the end gas ahead of the flame front in a petrol engine, producing pressure waves heard as knock
4. D.Compression ratio — ratio of total cylinder volume at BDC to clearance volume at TDC, about 8–12 for petrol and 16–22 for diesel engines

Answer + AI explanation with Pro

1. A.steam is reheated between the high- and low-pressure turbines to raise efficiency and keep exhaust dryness above about 88%
2. B.hypothetical constant pressure that would produce the cycle's net work over one power stroke, used to compare engines of different sizes
3. C.spontaneous auto-ignition of the end gas ahead of the flame front in a petrol engine, producing pressure waves heard as knock
4. D.a petrol's knock resistance relative to an iso-octane/n-heptane blend, with higher values allowing higher compression ratios

Answer + AI explanation with Pro

1. A.Octane number
2. B.Compression ratio
3. C.Mean effective pressure
4. D.Brake specific fuel consumption

Answer + AI explanation with Pro

1. A.Octane number — a petrol's knock resistance relative to an iso-octane/n-heptane blend, with higher values allowing higher compression ratios
2. B.Octane number — spontaneous auto-ignition of the end gas ahead of the flame front in a petrol engine, producing pressure waves heard as knock
3. C.Octane number — a diesel fuel's ignition quality expressed as shortness of ignition delay, with higher values giving smoother combustion
4. D.Octane number — fuel mass consumed per unit brake power per hour, the standard measure of an engine's fuel economy

Answer + AI explanation with Pro

1. A.spontaneous auto-ignition of the end gas ahead of the flame front in a petrol engine, producing pressure waves heard as knock
2. B.a diesel fuel's ignition quality expressed as shortness of ignition delay, with higher values giving smoother combustion
3. C.a petrol's knock resistance relative to an iso-octane/n-heptane blend, with higher values allowing higher compression ratios
4. D.hypothetical constant pressure that would produce the cycle's net work over one power stroke, used to compare engines of different sizes

Answer + AI explanation with Pro

1. A.Detonation
2. B.Cetane number
3. C.Reheat cycle
4. D.Volumetric efficiency

Answer + AI explanation with Pro

1. A.Cetane number — ratio of total cylinder volume at BDC to clearance volume at TDC, about 8–12 for petrol and 16–22 for diesel engines
2. B.Cetane number — steam is reheated between the high- and low-pressure turbines to raise efficiency and keep exhaust dryness above about 88%
3. C.Cetane number — a diesel fuel's ignition quality expressed as shortness of ignition delay, with higher values giving smoother combustion
4. D.Cetane number — fuel energy input per unit of electrical output in kJ/kWh, around 8,500 for a supercritical coal unit and above 10,000 for an old subcritical unit

Answer + AI explanation with Pro

1. A.ratio of air mass actually inducted to the mass that would fill the swept volume at ambient conditions, improved by turbocharging
2. B.hypothetical constant pressure that would produce the cycle's net work over one power stroke, used to compare engines of different sizes
3. C.ratio of total cylinder volume at BDC to clearance volume at TDC, about 8–12 for petrol and 16–22 for diesel engines
4. D.fuel mass consumed per unit brake power per hour, the standard measure of an engine's fuel economy

Answer + AI explanation with Pro

1. A.Compression ratio
2. B.Brake specific fuel consumption
3. C.Octane number
4. D.Cetane number

Answer + AI explanation with Pro

1. A.Brake specific fuel consumption — fuel mass consumed per unit brake power per hour, the standard measure of an engine's fuel economy
2. B.Brake specific fuel consumption — spontaneous auto-ignition of the end gas ahead of the flame front in a petrol engine, producing pressure waves heard as knock
3. C.Brake specific fuel consumption — hypothetical constant pressure that would produce the cycle's net work over one power stroke, used to compare engines of different sizes
4. D.Brake specific fuel consumption — ratio of air mass actually inducted to the mass that would fill the swept volume at ambient conditions, improved by turbocharging

Answer + AI explanation with Pro

1. A.a petrol's knock resistance relative to an iso-octane/n-heptane blend, with higher values allowing higher compression ratios
2. B.fuel mass consumed per unit brake power per hour, the standard measure of an engine's fuel economy
3. C.ratio of air mass actually inducted to the mass that would fill the swept volume at ambient conditions, improved by turbocharging
4. D.ratio of total cylinder volume at BDC to clearance volume at TDC, about 8–12 for petrol and 16–22 for diesel engines

Answer + AI explanation with Pro

1. A.Volumetric efficiency
2. B.Detonation
3. C.Brake specific fuel consumption
4. D.Octane number

Answer + AI explanation with Pro

1. A.Volumetric efficiency — ratio of total cylinder volume at BDC to clearance volume at TDC, about 8–12 for petrol and 16–22 for diesel engines
2. B.Volumetric efficiency — fuel mass consumed per unit brake power per hour, the standard measure of an engine's fuel economy
3. C.Volumetric efficiency — ratio of air mass actually inducted to the mass that would fill the swept volume at ambient conditions, improved by turbocharging
4. D.Volumetric efficiency — hypothetical constant pressure that would produce the cycle's net work over one power stroke, used to compare engines of different sizes

Answer + AI explanation with Pro

1. A.hypothetical constant pressure that would produce the cycle's net work over one power stroke, used to compare engines of different sizes
2. B.fuel mass consumed per unit brake power per hour, the standard measure of an engine's fuel economy
3. C.ratio of air mass actually inducted to the mass that would fill the swept volume at ambient conditions, improved by turbocharging
4. D.steam is reheated between the high- and low-pressure turbines to raise efficiency and keep exhaust dryness above about 88%

Answer + AI explanation with Pro

1. A.Heat rate
2. B.Detonation
3. C.Mean effective pressure
4. D.Octane number

Answer + AI explanation with Pro

1. A.Mean effective pressure — fuel mass consumed per unit brake power per hour, the standard measure of an engine's fuel economy
2. B.Mean effective pressure — ratio of total cylinder volume at BDC to clearance volume at TDC, about 8–12 for petrol and 16–22 for diesel engines
3. C.Mean effective pressure — a diesel fuel's ignition quality expressed as shortness of ignition delay, with higher values giving smoother combustion
4. D.Mean effective pressure — hypothetical constant pressure that would produce the cycle's net work over one power stroke, used to compare engines of different sizes

Answer + AI explanation with Pro

1. A.fuel mass consumed per unit brake power per hour, the standard measure of an engine's fuel economy
2. B.a diesel fuel's ignition quality expressed as shortness of ignition delay, with higher values giving smoother combustion
3. C.spontaneous auto-ignition of the end gas ahead of the flame front in a petrol engine, producing pressure waves heard as knock
4. D.ratio of air mass actually inducted to the mass that would fill the swept volume at ambient conditions, improved by turbocharging

Answer + AI explanation with Pro

1. A.Reheat cycle
2. B.Detonation
3. C.Volumetric efficiency
4. D.Mean effective pressure

Answer + AI explanation with Pro

1. A.Detonation — ratio of air mass actually inducted to the mass that would fill the swept volume at ambient conditions, improved by turbocharging
2. B.Detonation — a petrol's knock resistance relative to an iso-octane/n-heptane blend, with higher values allowing higher compression ratios
3. C.Detonation — spontaneous auto-ignition of the end gas ahead of the flame front in a petrol engine, producing pressure waves heard as knock
4. D.Detonation — steam is reheated between the high- and low-pressure turbines to raise efficiency and keep exhaust dryness above about 88%

Answer + AI explanation with Pro

1. A.spontaneous auto-ignition of the end gas ahead of the flame front in a petrol engine, producing pressure waves heard as knock
2. B.steam is reheated between the high- and low-pressure turbines to raise efficiency and keep exhaust dryness above about 88%
3. C.fuel mass consumed per unit brake power per hour, the standard measure of an engine's fuel economy
4. D.a diesel fuel's ignition quality expressed as shortness of ignition delay, with higher values giving smoother combustion

Answer + AI explanation with Pro

1. A.Cetane number
2. B.Brake specific fuel consumption
3. C.Reheat cycle
4. D.Heat rate

Answer + AI explanation with Pro

1. A.Reheat cycle — steam is reheated between the high- and low-pressure turbines to raise efficiency and keep exhaust dryness above about 88%
2. B.Reheat cycle — a diesel fuel's ignition quality expressed as shortness of ignition delay, with higher values giving smoother combustion
3. C.Reheat cycle — spontaneous auto-ignition of the end gas ahead of the flame front in a petrol engine, producing pressure waves heard as knock
4. D.Reheat cycle — fuel energy input per unit of electrical output in kJ/kWh, around 8,500 for a supercritical coal unit and above 10,000 for an old subcritical unit

Answer + AI explanation with Pro

1. A.a petrol's knock resistance relative to an iso-octane/n-heptane blend, with higher values allowing higher compression ratios
2. B.spontaneous auto-ignition of the end gas ahead of the flame front in a petrol engine, producing pressure waves heard as knock
3. C.fuel mass consumed per unit brake power per hour, the standard measure of an engine's fuel economy
4. D.fuel energy input per unit of electrical output in kJ/kWh, around 8,500 for a supercritical coal unit and above 10,000 for an old subcritical unit

Answer + AI explanation with Pro

1. A.Mean effective pressure
2. B.Detonation
3. C.Octane number
4. D.Heat rate

Answer + AI explanation with Pro

1. A.Heat rate — ratio of air mass actually inducted to the mass that would fill the swept volume at ambient conditions, improved by turbocharging
2. B.Heat rate — fuel energy input per unit of electrical output in kJ/kWh, around 8,500 for a supercritical coal unit and above 10,000 for an old subcritical unit
3. C.Heat rate — ratio of total cylinder volume at BDC to clearance volume at TDC, about 8–12 for petrol and 16–22 for diesel engines
4. D.Heat rate — a diesel fuel's ignition quality expressed as shortness of ignition delay, with higher values giving smoother combustion

Answer + AI explanation with Pro