MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Thermal Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is not an effect of air leakage in condensers? |
| A. | Reduced thermal efficiency of steam power plant |
| B. | Increased requirement of cooling water |
| C. | Increase in corrosive action in condenser |
| D. | Increased heat transfer in condenser |
| Answer» E. | |
| 2. |
What effect does air leakage in a condenser has on corrosion? |
| A. | Air leakage reduces corrosion |
| B. | Air leakage increases corrosion |
| C. | Air leakage does not affect corrosion |
| D. | Corrosive action increases or decreases depending upon the degree of leak |
| Answer» C. Air leakage does not affect corrosion | |
| 3. |
How does air leakage in condensers affect the heat transfer rate? |
| A. | Heat transfer is reduced |
| B. | Heat transfer is increased |
| C. | Heat transfer rate is not affected by air leakage |
| D. | Heat transfer rate increases or decreases depending on the rate of air leakage |
| Answer» B. Heat transfer is increased | |
| 4. |
How does air leakage in a condenser affect the requirement of cooling water? |
| A. | Air leakage reduces the amount of cooling water required |
| B. | Air leakage increases the amount of cooling water required |
| C. | Air leakage doesn t affect the amount of cooling water required |
| D. | Amount of cooling water required increases or decreases depending upon the rate of air leakage |
| Answer» C. Air leakage doesn t affect the amount of cooling water required | |
| 5. |
What is the effect of air leakage in condensers on thermal efficiency of the steam power plant? |
| A. | Thermal efficiency gets lowered |
| B. | Thermal efficiency increases |
| C. | Thermal efficiency remains unchanged |
| D. | It increases or decreases depending upon the degree of leak |
| Answer» B. Thermal efficiency increases | |
| 6. |
Which of the following statement about condensers is FALSE? |
| A. | Jet condensers are more suitable for high capacity plants owing to their high vacuum efficiency |
| B. | Surface condensers require more cooling water than jet condensers |
| C. | As compared to surface condensers, jet condensers require smaller floor space |
| D. | The manufacturing cost of surface condensers is greater than that of jet condensers |
| Answer» B. Surface condensers require more cooling water than jet condensers | |
| 7. |
Which of the following methods is the correct one for using pepprament oil to detect the source of air leakage? |
| A. | Put the pepprament oil on the suspected joint and wait for the bubbles |
| B. | Put the pepprament oil on the suspected joint and wait for it to get sucked |
| C. | Put the pepprament oil on the suspected joint and check for pepprament odour at the discharge of air ejector |
| D. | Put the pepprament oil on the suspected joint, pepprament oil being coloured will change the colour of condensed water |
| Answer» D. Put the pepprament oil on the suspected joint, pepprament oil being coloured will change the colour of condensed water | |
| 8. |
Which of the following statements is FALSE regarding air leakage in condensers? |
| A. | The sources of air leakage can be found by putting soap water at infiltration prone points |
| B. | The sources of air leakage can be found out by putting pepprament oil on suspected joints |
| C. | The source of air leakage, if large, can be found out by passing candle flame over possible openings |
| D. | Thermometer and vacuum gauge readings become steady when leakage is present in a condenser |
| Answer» E. | |
| 9. |
Surface condensers require more power for water pumping than jet condensers. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
Which of the following statements is not a correct reason for inefficiency in surface condensers? |
| A. | Air leakage |
| B. | High resistance faced by the steam while entering |
| C. | Condensate undercooling |
| D. | Circulating water passing through the condenser almost smoothly |
| Answer» E. | |