MCQOPTIONS
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MCQOPTIONS
This section includes 460 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Engines knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
When steam expands without doing mechanical work, its enthalpy |
| A. | Increases |
| B. | Decreases |
| C. | Does not change |
| D. | Depends on the factors |
| E. | None of the above |
| Answer» D. Depends on the factors | |
| 452. |
Which of the following pollutants result from automobile exhaust? |
| A. | Carbon monoxide |
| B. | Nitrous oxide |
| C. | Hydro carbons |
| D. | Sulphur dioxide |
| E. | All of the above |
| Answer» F. | |
| 453. |
Pure cetane |
| A. | Has cetane number of 0 |
| B. | Promotes detonation |
| C. | Is a straight chain paraffin |
| D. | Has cetane number of 100 |
| E. | Is a blue coloured liquid |
| Answer» D. Has cetane number of 100 | |
| 454. |
Coking is |
| A. | Formation of lumps or masses of coke in boiler furnaces at high temperatures |
| B. | Heating of coal in absence of air driving carbon and leaving behind the residue of carbon |
| C. | Burning of coal in a furnace |
| D. | Producing lumps of coal from fine powders with the help of a binder |
| E. | None of the above |
| Answer» C. Burning of coal in a furnace | |
| 455. |
Leaking radiator tubes are generally |
| A. | Soldered |
| B. | Welded |
| C. | Left unattended |
| D. | Brazed |
| E. | Replaced |
| Answer» B. Welded | |
| 456. |
During idling a petrol engine requires |
| A. | Rich mixture |
| B. | None of above |
| C. | Chemically correct mixture |
| D. | Variable mixture |
| E. | Lean mixture |
| Answer» B. None of above | |
| 457. |
In aircraft using gas turbine the cycle used is |
| A. | Reheating |
| B. | Regeneration |
| C. | Reheating with regeneration |
| D. | Simple |
| E. | Multi-stage expansion with reheating and regeneration |
| Answer» E. Multi-stage expansion with reheating and regeneration | |
| 458. |
A gas turbine cycle operates through pressures ratio of 5. Air enters the compressor at atmospheric pressure and 25?C and entry to the turbine is at 800?C. The thermal efficiency of the plant has been found to be 37%. Now, if compressor and turbine efficiencies of 80% are taken into account, the value, of thermal efficiency will be |
| A. | 37% |
| B. | 40% |
| C. | 38.50% |
| D. | 17.75% |
| E. | 45% |
| Answer» E. 45% | |
| 459. |
Fuel which detonates easily is |
| A. | Toulene |
| B. | Alcohol |
| C. | Iso-octane |
| D. | n-Heptane |
| E. | Benzene |
| Answer» E. Benzene | |
| 460. |
Generally steam turbines in power station operate at |
| A. | 1000 RPM |
| B. | 3000 RPM |
| C. | 375 RPM |
| D. | 50 RPM |
| E. | 1500 RPM |
| Answer» C. 375 RPM | |