McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 1. |
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» C. Calorific value | |
| 2. |
The calorific value of gaseous fuels is expressed in terms of |
| A. | kcal |
| B. | B. kcal/kg |
| C. | C. kcal/m² |
| D. | D. kcal/m3 |
| Answer» D. D. kcal/m3 | |
| 3. |
What is the significance of calorific value? |
| A. | Helps in deciding which fuel is good |
| B. | Helps in locating fuel |
| C. | Helps in deciding ignition temperature |
| D. | Helps in deciding fire point |
| Answer» A. Helps in deciding which fuel is good | |
| 4. |
Which gas has the highest calorific value among given option? |
| A. | Oxygen |
| B. | Helium |
| C. | Hydrogen |
| D. | Nitrogen |
| Answer» C. Hydrogen | |
| 5. |
Which calorimeter is used to find calorific values of solid and liquid fuels? |
| A. | Boy’s calorimeter |
| B. | Bomb calorimeter |
| C. | Junker’s calorimeter |
| D. | Calvet-type calorimeter |
| Answer» B. Bomb calorimeter | |
| 6. |
Which calorimeter is used to find calorific values of gaseous fuels? |
| A. | Bomb calorimeter |
| B. | Junker calorimeter |
| C. | Adiabatic calorimeter |
| D. | Isothermal titration calorimeter |
| Answer» B. Junker calorimeter | |
| 7. |
What is the factor on which, difference between the two heating values of fuel depends on? |
| A. | Physical properties |
| B. | Reactants |
| C. | Chemical composition |
| D. | Products |
| Answer» C. Chemical composition | |
| 8. |
The Bomb calorimeter is used to determine the calorific value of: |
| A. | solids and liquid fuels |
| B. | solid and gaseous fuels |
| C. | liquid fuels that can be easily vaporized |
| D. | solid fuels only |
| Answer» A. solids and liquid fuels | |
| 9. |
If the intake air temperature of I.C. engine increases, its efficiency will |
| A. | increase |
| B. | decrease |
| C. | remain same |
| D. | unpredictable |
| Answer» B. decrease | |
| 10. |
All heat engines utilize |
| A. | low heat value of oil |
| B. | high heat value of oil |
| C. | net claorific value of oil |
| D. | calorific value of fuel |
| Answer» A. low heat value of oil | |
| 11. |
An engine indicator is used to determine the following |
| A. | speed |
| B. | temperature |
| C. | volume of cylinder |
| D. | m.e.p. and I.H.P. |
| Answer» D. m.e.p. and I.H.P. | |
| 12. |
Fuel oil consumption guarantees for I .C. engine are usually based on |
| A. | low heat value of oil |
| B. | high heat value of oil |
| C. | net calorific value of oil |
| D. | calorific value of fuel |
| Answer» B. high heat value of oil | |
| 13. |
Combustion in compression ignition engines is |
| A. | homogeneous |
| B. | heterogeneous |
| C. | both (a) and (b) |
| D. | laminar |
| Answer» B. heterogeneous | |
| 14. |
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» B. loss | |
| 15. |
Diesel fuel, compared to petrol is |
| A. | less difficult to ignite |
| B. | just about the same difficult to ignite |
| C. | more difficult to ignite |
| D. | highly ignitable |
| Answer» C. more difficult to ignite | |
| 16. |
When crude oil is heated, then which of the following hydrocarbon is given off first. |
| A. | kerosene |
| B. | gasoline |
| C. | paraffin |
| D. | natural gas. |
| Answer» D. natural gas. | |
| 17. |
The rating of a diesel engine, with increase in air-intlet temperature, will |
| A. | increase linearly |
| B. | decrease linearly |
| C. | increase parabolically |
| D. | decrease parabolically |
| Answer» B. decrease linearly | |
| 18. |
A 75 cc engine has following parameter as 75 cc |
| A. | fuel tank capacity |
| B. | lub oil capacity |
| C. | swept volume |
| D. | cylinder volume |
| Answer» C. swept volume | |
| 19. |
A heat engine utilises the |
| A. | calorific value of oil |
| B. | low heat value of |
| C. | high heat value of oil |
| D. | mean heat value of oil |
| Answer» C. high heat value of oil | |
| 20. |
Gaseous-fuel guarantees are based on |
| A. | calorific value of oil |
| B. | low heat value of oil |
| C. | high heat value of oil |
| D. | mean heat value of oil |
| Answer» B. low heat value of oil | |
| 21. |
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» C. the small difference in cooling water temperature or in internal friction has a disproportionate effect | |
| 22. |
Polymerisation is a chemical process in which molecules of a compound become |
| A. | larger |
| B. | slowed down |
| C. | smaller |
| D. | liquid |
| Answer» A. larger | |
| 23. |
Which of the following is the lightest and most volatile liquid fuel |
| A. | diesel |
| B. | kerosene |
| C. | fuel oil |
| D. | gasoline |
| Answer» D. gasoline | |
| 24. |
The theoretically correct air fuel ratio for petrol engine is of the order of |
| A. | 6 : 1 |
| B. | 9 : 1 |
| C. | 12 : 1 |
| D. | 15 : 1 |
| Answer» D. 15 : 1 | |
| 25. |
Air fuel ratio for idling speed of a petrol engine is approximately |
| A. | 1 : 1 |
| B. | 5 : 1 |
| C. | 10:1 |
| D. | 15 : 1 |
| Answer» C. 10:1 | |
| 26. |
Air fuel ratio at which a petrol engine can not work is |
| A. | 8 : 1 |
| B. | 10 : 1 |
| C. | 15 : 1 |
| D. | 20 : 1 and less |
| Answer» D. 20 : 1 and less | |
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