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This set of Engineering Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on Engineering Thermodynamics Set 14
Q1 | In an open system, there is a transfer of which of the following quantity?
- mass
- energy
- entropy
- all of the mentioned
Q2 | A chip dissipates 2 kJ of electric work and rejects it as heat transfer from its surface which is at 50°C to 25°C air. How much entropy is generated in the chip?
- 4.19 j/k
- 5.19 j/k
- 6.19 j/k
- 7.19 j/k
Q3 | 15 = 6.19 J/K.
- 0.419 j/k
- 0.519 j/k
- 0.619 j/k
- 0.719 j/k
Q4 | Second law efficiency can also be given as
- 1 / ( first law efficiency * carnot efficiency)
- carnot efficiency * first law efficiency
- carnot efficiency / first law efficiency
- first law efficiency / carnot efficiency
Q5 | Second law efficiency is defined as
- actual exergy intake / minimum exergy intake
- minimum exergy intake / actual exergy intake
- actual exergy intake / maximum exergy intake
- maximum exergy intake / minimum exergy intake
Q6 | For a power plant, second law efficiency can be given by desired output(W) / available energy(Wmax).
- true
- false
Q7 | In case of a heat pump, second law efficiency is given as
- (first law efficiency)*(1-ta/to)
- (first law efficiency)*(1+to/ta)
- (first law efficiency)*(1-to/ta)
- none of the mentioned
Q8 | Both first law efficiency and second law efficiency indicate how effectively the input has been converted into the product.
- true
- false
Q9 | Which of the following curves meet at triple point?
- fusion curve and vaporization curve
- fusion curve and sublimation curve
- vaporization curve and sublimation curve
- fusion curve and vaporization curve and sublimation curve
Q10 | The slope of the fusion curve for water is
- negative
- positive
- zero
- none of the mentioned
Q11 | The equation which forms the basis of the Mollier diagram is
- tds=-dh+vdp
- tds=dh+vdp
- tds=dh-vdp
- none of the mentioned
Q12 | Which of the following statements is true?
- the slope of an isobar on h-s coordinates is equal to the absolute saturation temperature at that pressure
- is the temperature remains constant, the slope will also remain constant
- if the temperature increases, the slope of the isobar will also increase
- all of the mentioned
Q13 | Which of the following represents the latent heat of vaporization at a particular pressure.
- hf-hg
- hg-hf
- hf+hg
- none of the mentioned
Q14 | At critical pressure, value of Hg-Hf is
- two
- one
- zero
- infinity
Q15 | In the Mollier diagram, the constant pressure lines diverge from one another.
- true
- false
Q16 | Which of the following is a property of a pure substance?
- it has constant chemical composition throughout its mass
- it is a one-component system
- it may exist in one or more phases
- all of the mentioned
Q17 | For water, as temperature increases, volume always increases?
- true
- false
Q18 | Which of the following exists in a p-V diagram for water?
- saturated solid line
- saturated liquid lines
- saturated vapour line
- all of the mentioned
Q19 | The isotherm passing through the critical point is called the critical isotherm.
- true
- false
Q20 | The properties of water are arranged in the steam tables as functions of
- pressure
- temperature
- pressure and temperature
- none of the mentioned
Q21 | The internal energy of saturated water at the triple point is
- 1
- 0
- -1
- infinity
Q22 | The entropy of saturated water is chosen to be zero at triple point.
- true
- false
Q23 | When a liquid and its vapour are in equilibrium at a certain pressure and temperature, then which of the following is required to identify the saturation state.
- pressure
- temperature
- both pressure and temperature
- pressure or temperature
Q24 | Saturated liquid or the saturated vapour has how many independent variables?
- one
- two
- three
- none of the mentioned
Q25 | If data are required for intermediate temperatures or pressures, linear interpolation is normally accurate.
- true
- false