MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Operating pressures of the refrigerants at the evaporator in the ascending order for any application are |
| A. | R11, R12, R717, R22 |
| B. | R22, R717, R12, R11 |
| C. | R11, R12, R22, R717 |
| D. | R717, R22, R11, R12 |
| Answer» B. R22, R717, R12, R11 | |
| 2. |
Chemical formula of R-22 is given by: |
| A. | CCl4F |
| B. | CCl2F2 |
| C. | CHCl2F |
| D. | CHClF2 |
| Answer» E. | |
| 3. |
Chemical formula for ‘R22’ refrigerant: |
| A. | Monochloro difluoro methane |
| B. | Trichloro fluoro methane |
| C. | Dichloro monofluoro methane |
| D. | Dichloro difluoro methane |
| Answer» B. Trichloro fluoro methane | |
| 4. |
Choose undesirable properties of a secondary refrigerants. |
| A. | low freezing point |
| B. | high viscosity |
| C. | good stability |
| D. | low temperature pressure |
| Answer» C. good stability | |
| 5. |
How many chlorine atoms does the refrigerant R – 134a contain? |
| A. | Eight |
| B. | Seven |
| C. | One |
| D. | Nil |
| Answer» E. | |
| 6. |
Environment friendly refrigerant R 134a is used in the new generation domestic refrigerators. Its chemical formula is |
| A. | CHCIF2 |
| B. | C2CI3F3 |
| C. | C2CL2F4 |
| D. | C2H2F4 |
| Answer» E. | |
| 7. |
Environmental protection agencies advise against the use of chloro-fluoro-carbon refrigerants since they react with |
| A. | water vapour and cause acid rain |
| B. | plants and cause green house effect |
| C. | oxygen and cause depletion |
| D. | ozone layer |
| Answer» E. | |
| 8. |
Partial pressure of water vapour at dew point temperature of moist air is 1.5 × 10-3 MPa. The barometric pressure is 0.1 MPa. The specific humidity of air is |
| A. | 15.225 gm/kg da |
| B. | 9.47 gm/kg da |
| C. | 15.00 gm/kg da |
| D. | 9.33 gm/kg da |
| Answer» C. 15.00 gm/kg da | |
| 9. |
Moisture in Freon refrigeration system causes _____. |
| A. | Ineffective refrigeration |
| B. | High power consumption |
| C. | Freezing automatic regulating valve |
| D. | Corrosion of whole system |
| Answer» D. Corrosion of whole system | |