MCQOPTIONS
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MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The degree of saturation varies between -1 and 0. |
| A. | true |
| B. | false |
| Answer» C. | |
| 2. |
The degree of saturation is the ratio of |
| A. | (saturated specific humidity / actual specific humidity)^2 |
| B. | 1/(saturated specific humidity * actual specific humidity) |
| C. | saturated specific humidity / actual specific humidity |
| D. | actual specific humidity / saturated specific humidity |
| Answer» E. | |
| 3. |
Humidity ratio is given by the ratio of |
| A. | (mass of dry air per unit mass of water vapour)^2 |
| B. | 1/(mass of dry air * mass of water vapour) |
| C. | water vapour mass per unit mass of dry air |
| D. | mass of dry air per unit mass of water vapour |
| Answer» D. mass of dry air per unit mass of water vapour | |
| 4. |
If water is injected into a container with has unsaturated air, |
| A. | water will evaporate |
| B. | moisture content of air will decrease |
| C. | pw will decrease |
| D. | all of the mentioned |
| Answer» B. moisture content of air will decrease | |
| 5. |
HUMIDITY_RATIO_IS_GIVEN_BY_THE_RATIO_OF?$ |
| A. | (mass of dry air per unit mass of water vapour)^2 |
| B. | 1/(mass of dry air * mass of water vapour) |
| C. | water vapour mass per unit mass of dry air |
| D. | mass of dry air per unit mass of water vapour |
| Answer» D. mass of dry air per unit mass of water vapour | |
| 6. |
The degree of saturation varies between -1 and 0.$ |
| A. | true |
| B. | false |
| Answer» C. | |
| 7. |
The degree of saturation is the ratio of$ |
| A. | (saturated specific humidity / actual specific humidity)^2 |
| B. | 1/(saturated specific humidity * actual specific humidity) |
| C. | saturated specific humidity / actual specific humidity |
| D. | actual specific humidity / saturated specific humidity |
| Answer» E. | |
| 8. |
When unsaturated air flows over a sheet of water in an insulated chamber |
| A. | specific humidity of air decreases |
| B. | the water evaporates |
| C. | both air and water are cooled during evaporation |
| D. | all of the mentioned |
| Answer» B. the water evaporates | |
| 9. |
At any dbt, the ____ the difference of wbt reading below below dbt, ____ is the amount of water vapour held in mixture. |
| A. | smaller, smaller |
| B. | greater, greater |
| C. | greater, smaller |
| D. | smaller, greater |
| Answer» D. smaller, greater | |
| 10. |
The wet bulb temperature is the ____ temperature recorded by moistened bulb. |
| A. | lowest |
| B. | highest |
| C. | atmospheric |
| D. | none of the mentioned |
| Answer» B. highest | |
| 11. |
If water is injected into a container with has unsaturated air? |
| A. | water will evaporate |
| B. | moisture content of air will decrease |
| C. | pw will decrease |
| D. | all of the mentioned |
| Answer» B. moisture content of air will decrease | |
| 12. |
For saturated air, relative humidity is 0%. |
| A. | true |
| B. | false |
| Answer» C. | |
| 13. |
Relative humidity is defined as |
| A. | (saturation pressure of pure water) / pw |
| B. | pw / (saturation pressure of pure water) |
| C. | (saturation pressure of pure water) / p |
| D. | p / (saturation pressure of pure water) |
| Answer» C. (saturation pressure of pure water) / p | |
| 14. |
When pw is very small, |
| A. | saturation temperature of water vapour at pw is less than atmospheric temperature |
| B. | water vapour in air exists in superheated state |
| C. | air is said to be in unsaturated state |
| D. | all of the mentioned |
| Answer» E. | |
| 15. |
In a mixture of dry air and water vapour, |
| A. | mole fraction of dry air = pa/p |
| B. | mole fraction of water vapour = pw/p |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 16. |
Which of the following is true?(here pa=partial pressure of dry air, pw=partial pressure of water vapour, p=atmospheric pressure) |
| A. | p=pw |
| B. | p=pa |
| C. | p=pw + pa |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 17. |
Complete dry air exists in nature. |
| A. | true |
| B. | false |
| Answer» C. | |
| 18. |
Dry air consists of |
| A. | oxygen, nitrogen |
| B. | carbon dioxide |
| C. | hydrogen, argon |
| D. | all of the mentioned |
| Answer» E. | |