MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Air Conditioning knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature between DBT and WBT. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
During the sensible cooling process, specific humidity decreases. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
Which of the following is not an indirect method of air-washer humidification? |
| A. | Using vaporization after cooling |
| B. | Using heated spray water |
| C. | Using re-circulated spray water without prior heating of air |
| D. | By pre-heating the air and then washing it with re-circulated air |
| Answer» B. Using heated spray water | |
| 4. |
During humidification process the dry bulb temperature ___________ |
| A. | increases |
| B. | decreases |
| C. | tends to zero |
| D. | remains the same |
| Answer» E. | |
| 5. |
What is the value of Latent heat transfer in a process of humidification having hfg = 10 kJ / kg of dry air, W1 = 0.0071 kJ / kg of dry air and W2 = 0.0017 kJ / kg of dry air? |
| A. | 0.054 |
| B. | 0.0054 |
| C. | 0.54 |
| D. | 5.4 |
| Answer» B. 0.0054 | |
| 6. |
What is the value of Latent heat transfer in the process of dehumidification having enthalpies as 19.45 and 13.67 kJ/ kg of dry air respectively? |
| A. | 5.78 |
| B. | -5.78 |
| C. | 33.12 |
| D. | -33.12 |
| Answer» B. -5.78 | |
| 7. |
What is the value of Latent heat transfer in the process of humidification having enthalpies as 20 and 40 kJ / kg of dry air respectively? |
| A. | 60 |
| B. | 40 |
| C. | -20 |
| D. | 20 |
| Answer» E. | |
| 8. |
Which of the following process is used in summer air conditioning? |
| A. | Humidification |
| B. | Dehumidification |
| C. | Heating and Humidification |
| D. | Cooling and Dehumidification |
| Answer» E. | |
| 9. |
Which of the following process is used in winter air conditioning? |
| A. | Humidification |
| B. | Dehumidification |
| C. | Heating and Humidification |
| D. | Cooling and Dehumidification |
| Answer» D. Cooling and Dehumidification | |
| 10. |
The minimum temperature to which moist air can be cooled under ideal conditions in a spray washer is ___________ |
| A. | DPT of inlet air |
| B. | Water inlet temperature |
| C. | WBT of inlet air |
| D. | Water outlet temperature |
| Answer» D. Water outlet temperature | |
| 11. |
What is the relation between DBT and WBT if the relative humidity is 100%? |
| A. | DBT = WBT |
| B. | DBT > WBT |
| C. | DBT ≫ WBT |
| D. | DBT < WBT |
| Answer» B. DBT > WBT | |
| 12. |
Which of the following is denoted by LH = (h1 – h2) = hfg (W1 – W2)? |
| A. | Sensible cooling |
| B. | Sensible heating |
| C. | Humidification |
| D. | Dehumidification |
| Answer» E. | |
| 13. |
Which of the following is denoted by LH = (h2 – h1) = hfg (W2 – W1)? |
| A. | Sensible cooling |
| B. | Sensible heating |
| C. | Humidification |
| D. | Dehumidification |
| Answer» D. Dehumidification | |
| 14. |
Which of the following denotes dehumidification process on the psychrometric chart? |
| A. | A horizontal line with an arrow towards the right |
| B. | Vertical line with arrow upwards |
| C. | A horizontal line with an arrow towards the right |
| D. | Vertical line with arrow downwards |
| Answer» E. | |
| 15. |
Which of the following denotes Humidification process on the psychrometric chart? |
| A. | A horizontal line with an arrow towards right |
| B. | Vertical line with arrow upwards |
| C. | Horizontal line with an arrow towards right |
| D. | Vertical line with arrow downwards |
| Answer» C. Horizontal line with an arrow towards right | |