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McqMate
Chapters
1. |
The centrifugal type supercharger is preferable only for |
A. | low speeds |
B. | high speeds |
C. | high pressures |
D. | none of the above |
Answer» A. low speeds |
2. |
The advantage of Root's supercharger is |
A. | big pressure |
B. | minimum maintenance |
C. | consumes less power |
D. | occupies less space |
Answer» B. minimum maintenance |
3. |
Supercharging air compressor is driven by |
A. | exhaust gas turbine |
B. | engine itself |
C. | separate electrical motor |
D. | none of the above |
Answer» B. engine itself |
4. |
If turbochargers compressor is driven by |
A. | exhaust gas turbine |
B. | engine itself |
C. | separate electrical motor |
D. | none of the above |
Answer» A. exhaust gas turbine |
5. |
Cooling after compression is necessary to |
A. | increase the density of air |
B. | reduce engine operating temperatures |
C. | both (a) and (b) |
D. | increase exhaust temperature |
Answer» C. both (a) and (b) |
6. |
Volumetric efficiency of supercharged engine is |
A. | between 100 - 110% |
B. | between 90 - 100% |
C. | between 80 - 90% |
D. | between 70 - 80% |
Answer» A. between 100 - 110% |
7. |
Supercharging is normally done in |
A. | racing cars |
B. | marine engines |
C. | automotive diesel engines |
D. | none of the above |
Answer» D. none of the above |
8. |
Compared to engine driven supercharger the exhaust driven super charger is |
A. | easy to handle |
B. | supplies more air |
C. | utilizes the exhaust energy of the engine |
D. | matching with engine is easy |
Answer» C. utilizes the exhaust energy of the engine |
9. |
Types of supercharger are |
A. | reciprocating type |
B. | gear type |
C. | centrifugal type |
D. | none of the above |
Answer» C. centrifugal type |
10. |
The operation of forcing additional air under pressure in the engine cylinder is known as |
A. | scavenging |
B. | turbulence |
C. | supercharging |
D. | pre-ignition |
Answer» C. supercharging |
11. |
Supercharging is essential in |
A. | diesel engines |
B. | gas turbines |
C. | petrol engines |
D. | aircraft engines. |
Answer» D. aircraft engines. |
12. |
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» D. supercharging. |
13. |
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. | providing forced cooling air |
C. | injecting excess fuel for raising more load |
D. | supplying compressed air to remove combustion products fully |
Answer» A. supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere |
14. |
Pick up the wrong statement about supercharging |
A. | supercharging reduces knocking in diesel engines |
B. | there can be limited supercharging in petrol engines because of detonation |
C. | supercharging at high altitudes is essential |
D. | supercharging results in fuel economy |
Answer» D. supercharging results in fuel economy |
15. |
The reason for supercharging in any engine is to |
A. | increase efficiency |
B. | increase power |
C. | reduce weight and bulk for a given out-put |
D. | effect fuel economy |
Answer» C. reduce weight and bulk for a given out-put |
16. |
For the same power developed in I.C. engines, the cheaper system is |
A. | naturally aspirated |
B. | supercharged |
C. | centrifugal pump |
D. | turbo charger |
Answer» B. supercharged |
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