MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Refrigeration knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Finned evaporators are also known as prime surface evaporators. |
| A. | False |
| B. | True |
| Answer» B. True | |
| 2. |
Which type of evaporator is generally used to cool drinking water? |
| A. | Shell and tube evaporator |
| B. | Finned evaporator |
| C. | Shell and coil evaporator |
| D. | Plate evaporator |
| Answer» D. Plate evaporator | |
| 3. |
Which type of evaporator is used in household refrigerators? |
| A. | frosting evaporator |
| B. | defrosting evaporator |
| C. | non-frosting evaporator |
| D. | non-corrosive evaporator |
| Answer» B. defrosting evaporator | |
| 4. |
Which type of evaporator is generally used for wine cooling and chilling oil in the petroleum industry? |
| A. | Tube-in-tube evaporator |
| B. | Finned evaporator |
| C. | Shell and tube evaporator |
| D. | Plate evaporator |
| Answer» B. Finned evaporator | |
| 5. |
Which type of evaporator is generally used in home freezers, ice cream cabinets, etc? |
| A. | Shell and coil evaporator |
| B. | Finned evaporator |
| C. | Shell and tube evaporator |
| D. | Plate evaporator |
| Answer» E. | |
| 6. |
The bare tube evaporators are called as _______ evaporators. |
| A. | extended surface |
| B. | bare surface |
| C. | pipe surface |
| D. | prime surface |
| Answer» E. | |
| 7. |
What is the value of the fluid side heat transfer coefficient when air flows over cold pipes by natural convection? |
| A. | 0.2 (T<sub>a</sub> T<sub>m</sub> / D)<sup>1/4</sup> |
| B. | 0.2 (T<sub>a</sub> T<sub>m</sub> / D) |
| C. | 0.2 (T<sub>a</sub> T<sub>m</sub> / D)<sup>1/3</sup> |
| D. | 0.2 (T<sub>a</sub> T<sub>m</sub> / D)<sup>1/2</sup> |
| Answer» B. 0.2 (T<sub>a</sub> T<sub>m</sub> / D) | |
| 8. |
What is the value of fluid side heat transfer coefficient when air flows over finned coil by forced convection? |
| A. | C x (m)<sup>0.1</sup> |
| B. | C x (m)<sup>0.2</sup> |
| C. | C x (m)<sup>0.3</sup> |
| D. | C x (m)<sup>0.4</sup> |
| Answer» E. | |
| 9. |
What is the value of the fluid side heat transfer coefficient when liquid flows through the evaporator shell? |
| A. | C x m |
| B. | C x (m)<sup>0.5</sup> |
| C. | C x (m)<sup>2</sup> |
| D. | C x (m)<sup>3</sup> |
| Answer» C. C x (m)<sup>2</sup> | |
| 10. |
Which of the following is not a factor affecting the capacity of evaporator? |
| A. | Velocity of refrigerant |
| B. | The thickness of the evaporator coil wall |
| C. | Material |
| D. | Evaporator pressure |
| Answer» E. | |
| 11. |
What is the formula for the capacity of evaporator? |
| A. | Q = U A<sup>2</sup> (T<sub>2</sub> T<sub>1</sub>) |
| B. | Q = U A (T<sub>2</sub> T<sub>1</sub>) |
| C. | Q = A (T<sub>2</sub> T<sub>1</sub>) |
| D. | Q = U (T<sub>2</sub> T<sub>1</sub>) |
| Answer» C. Q = A (T<sub>2</sub> T<sub>1</sub>) | |
| 12. |
What evaporator does to the refrigerant coming from expansion valve in terms of state? |
| A. | high-pressure liquid refrigerant |
| B. | low-pressure liquid and vapor refrigerant |
| C. | low-pressure vapor refrigerant |
| D. | high-pressure vapor refrigerant |
| Answer» C. low-pressure vapor refrigerant | |
| 13. |
Evaporator is also called as Freezing, cooling or chilling coil. |
| A. | False |
| B. | True |
| Answer» C. | |
| 14. |
What is the pressure side of a refrigerating system in which evaporator is used? |
| A. | Low pressure |
| B. | Zero pressure |
| C. | Negative pressure |
| D. | High pressure |
| Answer» B. Zero pressure | |
| 15. |
Why is the evaporator used? |
| A. | To improve C.O.P. |
| B. | To decrease the refrigeration effect |
| C. | To absorb heat |
| D. | To reject heat |
| Answer» D. To reject heat | |