- A. Heat rejection is lower
- B. Expansion and compression are isentropic
- C. Combustion is at constant volume
- D. Maximum temperature is higher
Engineering Thermodynamics
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Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle_____.
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Gases have_____.
- A. Only one value of specific heat
- B. Two values of specific heat
- C. No value of specific heat
- D. Under some conditions one value and sometimes two values of specific heat
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Which of the following statement is wrong?
- A. The closed cycle gas turbine plants are external combustion plants.
- B. In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.
- C. The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.
- D. In open cycle gas turbine, atmosphere acts as a sink and no coolant is required.
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When the gas is heated at constant pressure, the heat supplied_____.
- A. Increases the internal energy of the gas
- B. Increases the temperature of the gas
- C. Does some external work during expansion
- D. Both (B) and (C)
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Which of the following processes is irreversible process?
- A. Isothermal
- B. Adiabatic
- C. Throttling
- D. All of the above
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The efficiency of Joule cycle is_____.
- A. Less than Carnot cycle
- B. Equal to Carnot cycle
- C. Greater than Carnot cycle
- D. None of these
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An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is_____.
- A. Feasible
- B. Impossible
- C. Possible
- D. Possible, but with lot of sophistications
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A gas is compressed in a cylinder by a movable piston to a volume one half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be_____.
- A. 300 Nm
- B. 300,000 Nm
- C. 30 Nm
- D. 3000 Nm
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To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is_____.
- A. Divided by its molecular weight
- B. Multiplied by its molecular weight
- C. Multiplied by its density
- D. Multiplied by its specific weight
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All perfect gases change in volume by 1/273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called_____.
- A. Boyle’s law
- B. Charles’ law
- C. Gay-Lussac law
- D. Joule’s law