Creating an Energy Efficient Engine
Trending Questions
Q. The above P-V diagram represents the thermodynamic cycle of an engine, operating with an ideal monoatomic gas. The amount of heat, extracted from the source in a single cycle is:
- PoVo
- (132)PoVo
- (112)PoVo
- 4PoVo
Q. In a fuel cell, methanol is used as a fuel and O2 is used as an oxidizer. The standard enthalpy of combustion of methanol is −726 kJmol−1. The standard free energies of formation of CH3OH(l), CO2(g) and H2O(l) are − 166.3, −394.4 and −237.1 kJmol−1 respectively. The efficiency of the fuel cell will be:
- 96.8%
- 66.2%
- 41.3%
- 85.1%
Q. The above P-V diagram represents the thermodynamic cycle of an engine, operating with an ideal monoatomic gas. The amount of heat, extracted from the source in a single cycle is:
- PoVo
- (132)PoVo
- (112)PoVo
- 4PoVo
Q. Heat is transferred to a heat engine from a furnace at a rate of 80 MW. If the rate of water heat rejection to a nearby river is 50 MW,
determine the thermal efficiency for this heat engine.
determine the thermal efficiency for this heat engine.- 47.5 %
- 27.5%
- 37.5%
- None of the mentioned
Q. In a fuel cell, methanol is used as a fuel and O2 is used as an oxidizer. The standard enthalpy of combustion of methanol is −726 kJmol−1. The standard free energies of formation of CH3OH(l), CO2(g) and H2O(l) are − 166.3, −394.4 and −237.1 kJmol−1 respectively. The efficiency of the fuel cell will be:
- 96.8%
- 66.2%
- 41.3%
- 85.1%
