McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 1. |
The Wet bulb depression is zero when Relative humidity equals |
| A. | 0 |
| B. | 0.5 |
| C. | 0.75 |
| D. | 1 |
| Answer» D. 1 | |
| 2. |
.In a psychrometric chart, the vertical lines parallel to the ordinate indicate |
| A. | Dry bulb Temperature |
| B. | Wet bulb Temperature |
| C. | Specific humidity |
| D. | Enthalpy of saturation |
| Answer» A. Dry bulb Temperature | |
| 3. |
Which of the following statements are TRUE? |
| A. | Thermodynamic WBT is a property of moist air, while WBT as measured by wet bulb thermometer is not a property |
| B. | Both the thermodynamic WBT and WBT as measured by wet bulb thermometer are properties of moist air |
| C. | Under no circumstances, dry bulb and wet bulb temperatures are equal |
| D. | Wet bulb temperature is always lower than dry bulb temperature, but higher than dew point temperature |
| Answer» A. Thermodynamic WBT is a property of moist air, while WBT as measured by wet bulb thermometer is not a property | |
| 4. |
Which of the following statements are TRUE? |
| A. | During cooling and humidification process, the enthalpy of air decreases |
| B. | During cooling and humidification process, the enthalpy of air increases |
| C. | During cooling and humidification process, the enthalpy of air remains constant |
| D. | During cooling and humidification process, the enthalpy of air may increase, decrease or remain constant depending upon the temperature of the wet surface |
| Answer» D. During cooling and humidification process, the enthalpy of air may increase, decrease or remain constant depending upon the temperature of the wet surface | |
| 5. |
An air stream at a flow rate of 1 kg/s and a DBT of 30 C mixes adiabatically with another air stream flowing with a mass flow rate of 2 kg/s and at a DBT of 15 C. Assuming no condensation to take place, the temperature of the mixture is approximately equal to: |
| A. | 20 C |
| B. | 22.5 C |
| C. | 25 C |
| D. | Cannot be found |
| Answer» A. 20 C | |
| 6. |
The temperature at which the water vapour in the air starts. condensing is known as |
| A. | dew point |
| B. | dry bulb |
| C. | wet bulb |
| D. | saturation |
| Answer» A. dew point | |
| 7. |
When moisture is added to air at constant dry bulb temperature, the process is known as |
| A. | Sensible cooling |
| B. | humidification |
| C. | dehumidification |
| D. | Chilling |
| Answer» B. humidification | |
| 8. |
Which of the following can be measured by a sling psychrometer? |
| A. | Wet bulb temperature |
| B. | Dry bulb as well as wet bulb temperatures |
| C. | Specific humidity |
| D. | Absolute humidity |
| Answer» B. Dry bulb as well as wet bulb temperatures | |
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