MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Power Plant knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In a diesel engine, the duration between the time of injection and ignition is known as? |
| A. | delay period |
| B. | period of ignition |
| C. | burning period |
| D. | pre-ignition period |
| Answer» B. period of ignition | |
| 2. |
A moderator generally used in nuclear power plants is? |
| A. | heavy water |
| B. | concrete |
| C. | graphite & concrete |
| D. | graphite |
| Answer» D. graphite | |
| 3. |
The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called? |
| A. | overall efficiency |
| B. | mechanical efficiency |
| C. | relative efficiency |
| D. | volumetric efficiency |
| Answer» E. | |
| 4. |
The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the __________ |
| A. | jet area is automatically varied depending on the suction |
| B. | the flow from the main jet is diverted to the compensating jet with increase in speed |
| C. | flow is produced due to the static head in the float chamber |
| D. | the diameter of the jet is constant and the discharge coefficient is invariant |
| Answer» D. the diameter of the jet is constant and the discharge coefficient is invariant | |
| 5. |
The object of supercharging the engine is __________ |
| A. | to increase the power output of an engine when greater power is required |
| B. | to reduce mass of the engine per brake power |
| C. | to reduce space occupied by the engine |
| D. | all of the mentioned |
| Answer» E. | |
| 6. |
Supercharging is the process of __________ |
| A. | Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere |
| B. | Supplying compressed air to remove combustion products fully |
| C. | Providing excess temperature to the sucked in gases |
| D. | None of the mentioned |
| Answer» B. Supplying compressed air to remove combustion products fully | |
| 7. |
What is the maximum temperature in the I.C. engine cylinder is of the order of(in degree Celsius)? |
| A. | 500-1000 |
| B. | 1000-1500 |
| C. | 1500-2000 |
| D. | 2000-2500 |
| Answer» E. | |
| 8. |
What is the pour point of fuel oil? |
| A. | Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame |
| B. | Temperature at which it solidifies or congeals |
| C. | It catches fire without external aid |
| D. | Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off |
| Answer» C. It catches fire without external aid | |
| 9. |
Reactors for propulsion applications are designed for__________ |
| A. | any form of uranium |
| B. | natural uranium |
| C. | enriched uranium |
| D. | thorium |
| Answer» D. thorium | |
| 10. |
The probability of knocking in diesel engines is increased by __________ |
| A. | high self-ignition temperature |
| B. | low volatility |
| C. | high viscosity |
| D. | all of the mentioned |
| Answer» E. | |
| 11. |
The mean effective pressure obtained from engine indicator indicates the __________ |
| A. | maximum pressure developed |
| B. | minimum pressure developed |
| C. | instantaneous pressure at any point |
| D. | average pressure |
| Answer» E. | |
| 12. |
The ignition quality of petrol is expressed by __________ |
| A. | Cetane number |
| B. | Octane number |
| C. | Calorific Value |
| D. | None of the mentioned |
| Answer» C. Calorific Value | |
| 13. |
The operation of forcing additional air under pressure in the engine cylinder is known as __________ |
| A. | Supercharging |
| B. | Scavenging |
| C. | Turbulence |
| D. | Pre-ignition |
| Answer» B. Scavenging | |