MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
The output of a diesel engine can be increased without increasing the engine revolution or size in following way |
| A. | feeding more fuel |
| B. | increasing flywheel size |
| C. | heating incoming air |
| D. | supercharging. |
| Answer» E. | |
| 2. |
For a compressor process with variable specific heat the peak temperature and pressure are _______compared to constant specific heat |
| A. | lower |
| B. | higher |
| C. | no effect |
| D. | none of the above |
| Answer» B. higher | |
| 3. |
Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following |
| A. | piston ring and cylinder wear |
| B. | formation of hard coating on piston skirts |
| C. | oil sludge in the engine crank case |
| D. | detonation |
| Answer» E. | |
| 4. |
When the throttle is suddenly opened, the mixture of the simple carburetor tends to become |
| A. | rich |
| B. | lean |
| C. | stoichiometric |
| D. | not affected |
| Answer» C. stoichiometric | |
| 5. |
Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads |
| A. | the friction is high |
| B. | the friction is unpredictable |
| C. | the small difference in cooling water temperature or in internal friction has a disproportionate effect |
| D. | the engine is rarely operated |
| Answer» D. the engine is rarely operated | |
| 6. |
The amount of heat liberated by complete combustion of unit quantity of fuel is known as ________ |
| A. | Agitation |
| B. | Combustion |
| C. | Calorific value |
| D. | Thermogenesis |
| Answer» D. Thermogenesis | |
| 7. |
Which of the following is one of the major exhaust emissions from CI engines compared to SI engines? |
| A. | Oxides of nitrogen |
| B. | Particulates |
| C. | CO and CO2 |
| D. | Unburnt hydrocarbon |
| Answer» C. CO and CO2 | |
| 8. |
Which stage of vehicle emission norms presently applicable in India in Internal Combustion Engine? |
| A. | Bharat Stage V |
| B. | Bharat Stage IV |
| C. | Bharat Stage III |
| D. | Bharat Stage II |
| Answer» C. Bharat Stage III | |
| 9. |
The air requirement of a petrol engine during starting compared to theoretical required for complete combustion is |
| A. | more |
| B. | loss |
| C. | same |
| D. | may be more or less depending on engine capacity |
| Answer» C. same | |
| 10. |
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called |
| A. | net efficiency |
| B. | efficiency ratio |
| C. | relative efficiency |
| D. | overall efficiency |
| Answer» D. overall efficiency | |
| 11. |
The actual efficiency of a good engine is about _______of the estimated fuel-air cycle efficiency. |
| A. | 100% |
| B. | 85% |
| C. | 50% |
| D. | 25% |
| Answer» C. 50% | |
| 12. |
For a four cylinder engine operating at N rpm, the contact breaker must make and break the circuit |
| A. | N times |
| B. | 2N times |
| C. | N/2 times |
| D. | none of the above |
| Answer» C. N/2 times | |