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1 | |
What is
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for an ideal gas? |
| | A) | - 1 / P |
| | B) | - R / P |
| | C) | - 1 / T |
| | D) | - R / T |
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2 | |
The slope of the R-134a liquid-vapor saturation line at 0 °C on a phase diagram is: |
| | A) | 10.6 kPa/K |
| | B) | 10.6 K/kPa |
| | C) | 15.3 kPa/K |
| | D) | 15.3 K/kPa |
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3 | |
According to the Gibbs relations, what is the relationship between the enthalpy of vaporization and entropy of vaporization? |
| | A) | sfg = ufg / T |
| | B) | sfg = ufg / P |
| | C) | sfg = hfg / T |
| | D) | sfg = hfg / P |
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4 | |
What is
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for an ideal gas? |
| | A) | du = cvdT - v / R |
| | B) | du = cvdT |
| | C) | du = cvdT - T / P |
| | D) | none of these |
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5 | |
The entropy change of an ideal gas whose specific heats are constant is given by: |
| | A) | cP ln (T2 / T1) - R ln (P2 / P1) |
| | B) | cP ln (P2 / P1) - R ln (T2 / T1) |
| | C) | cvln (T2 - T1) - R ln (P2 / P1) |
| | D) | cvln (T2 - T1) - R ln (P2 / P1) |
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6 | |
Working fluids used in refrigeration cycles decrease in temperature as they pass through the throttle valve. The Joule-Thompson coefficient of these fluids is: |
| | A) | Negative |
| | B) | 0 |
| | C) | Positive |
| | D) | None of these |
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7 | |
The constant pressure specific heat of an ideal gas is given by cP = a + bT + cT 2, where a, b, and c are constants and T is the absolute temperature. The entropy change of this gas is given by: |
| | A) | a (T2–T1) –R ln (P2 / P1) |
| | B) | a ln (T2 / T1) + b (T2–T1) –R ln (P2 / P1) |
| | C) | a ln (T2 / T1) + b (T2–T1) + c (T22–T12) / 2 –R ln (P2 / P1) |
| | D) | a (T2–T1) + b (T22–T12) / 2 + c (T23–T13) / 3 –R ln (P2 / P1) |
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8 | |
What is the enthalpy departure of carbon dioxide at 14.8 MPa, 456 K? |
| | A) | 0.8 |
| | B) | 1.0 |
| | C) | 1.5 |
| | D) | 2.0 |
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9 | |
What is the difference in the enthalpy of carbon dioxide at state 1 where P1 = 14.8 MPa, T1 = 460 K and state 2 where P2 = 100 kPa, T2 = 300 K? |
| | A) | -3960 kJ/k mol |
| | B) | -5240 kJ/k mol |
| | C) | -6490 kJ/k mol |
| | D) | -7320 kJ/k mol |
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10 | |
What is the difference in the entropy of carbon dioxide at state 1 where P1 = 14.8 MPa, T1 = 460 K and state 2 where P2 = 100 kPa, T2 = 300 K? |
| | A) | -5.32 kJ/kg-mol-K |
| | B) | 0 kJ/kg-mol-K |
| | C) | 14.37 kJ/kg-mol-K |
| | D) | 28.48 kJ/kg-mol-K |
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2002 McGraw-Hill Higher Education