MCQOPTIONS
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MCQOPTIONS
This section includes 44 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In an automobile engine the temperature of the piston will be more at |
| A. | The crown of the piston |
| B. | The skirt of the piston |
| C. | The piston walls |
| D. | The piston rings |
| Answer» B. The skirt of the piston | |
| 2. |
The function of a piston is |
| A. | It forms a movable wall of combustion chamber |
| B. | It transmits turning force to the crankshaft via connecting rod |
| C. | It functions like crosshead and transmits side thrusts |
| D. | All of the mentioned |
| Answer» E. | |
| 3. |
A 150 c.c. two-stroke petrol engine running at 5000 rpm can develop a maximum brake power of |
| A. | 15 kW |
| B. | 10 kW |
| C. | 5 kW |
| D. | 1 kW |
| Answer» D. 1 kW | |
| 4. |
In a diesel engine the temperature of gases under full load may be of the order of |
| A. | 550-650 degree Celsius |
| B. | 200-300 degree Celsius |
| C. | 150-200 degree Celsius |
| D. | 100 degree Celsius |
| Answer» B. 200-300 degree Celsius | |
| 5. |
What is the material of the connecting rod |
| A. | Mild steel |
| B. | Forged steel |
| C. | Tool steel |
| D. | Cast iron |
| Answer» C. Tool steel | |
| 6. |
The plate which acts as a packing between cylinder block and cylinder head is called |
| A. | Chaplet |
| B. | Liner |
| C. | Gasket |
| D. | Flange |
| Answer» D. Flange | |
| 7. |
The thickness of wet liners ranges from |
| A. | 1.5 mm to 6 mm |
| B. | 1 mm to 2 mm |
| C. | 6 mm to 10 mm |
| D. | 0.5 mm to 2.5 mm |
| Answer» B. 1 mm to 2 mm | |
| 8. |
Engines used in tractors are |
| A. | Single cylinder engines |
| B. | Two cylinder engines |
| C. | Four cylinder engines |
| D. | Six cylinder engines |
| Answer» C. Four cylinder engines | |
| 9. |
W-type arrangement in twelve and sixteen cylinder engines has |
| A. | One row of cylinders |
| B. | Two rows of cylinders |
| C. | Three rows of cylinders |
| D. | Four rows of cylinders |
| Answer» D. Four rows of cylinders | |
| 10. |
A gas undergoes step 4 in Carnot cycle. Which of these processes describes the 2nd step |
| A. | Isentropic expansion |
| B. | Isentropic compression |
| C. | Isothermal expansion |
| D. | Isothermal compression |
| Answer» C. Isothermal expansion | |
| 11. |
A steam engine comes under the category of |
| A. | External combustion engines |
| B. | Internal combustion engines |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» B. Internal combustion engines | |
| 12. |
The thickness of dry liners ranges from |
| A. | 3 mm to 9mm |
| B. | 1.5 mm to 3 mm |
| C. | 1 mm to 2 mm |
| D. | 0.5 mm to 2.5 mm |
| Answer» C. 1 mm to 2 mm | |
| 13. |
The entrance of the piston pin hole is sealed by |
| A. | Steel plating |
| B. | Snap ring |
| C. | Rubber ring |
| D. | None of the mentioned |
| Answer» C. Rubber ring | |
| 14. |
In two-stroke cycle engines, what replaces valves of a four-stroke engine |
| A. | Fins |
| B. | Notches |
| C. | Ports |
| D. | Tubes |
| Answer» D. Tubes | |
| 15. |
Piston pin is also known as |
| A. | Gudgeon pin |
| B. | Crank pin |
| C. | Screw pin |
| D. | None of the mentioned |
| Answer» B. Crank pin | |
| 16. |
The crankshaft rotates the camshaft using |
| A. | Belt drive |
| B. | Chain drive |
| C. | Gear drive |
| D. | Motor drive |
| Answer» C. Gear drive | |
| 17. |
The purpose of a piston pin is that |
| A. | It prevents the valve from rotating |
| B. | It links the connecting rod to the crankshaft |
| C. | It ensure the piston ring to the piston |
| D. | It connect the piston to the connecting rod |
| Answer» E. | |
| 18. |
Engines used in Ashok Leyland Comet trucks are |
| A. | Single cylinder engines |
| B. | Two cylinder engines |
| C. | Four cylinder engines |
| D. | Six cylinder engines |
| Answer» E. | |
| 19. |
Piston rings are not completely closed because |
| A. | Closed rings are hard to manufacture |
| B. | Gap allows the ring to expand and fit over |
| C. | They are designed to let pass some lubricant to the combustion chamber |
| D. | None of the mentioned |
| Answer» C. They are designed to let pass some lubricant to the combustion chamber | |
| 20. |
Passenger car engines contain |
| A. | 2 compression ring and 1 oil control ring |
| B. | 2 compression ring and 2 oil control ring |
| C. | 1 compression ring and 1 oil control ring |
| D. | 2 compression ring and no oil control ring |
| Answer» B. 2 compression ring and 2 oil control ring | |
| 21. |
The function of crankcase in two stroke petrol engines is |
| A. | It holds the engine lubricating oil |
| B. | It forms a pressurised chamber for fuel air mixture |
| C. | It holds the exhaust gases after combustion |
| D. | None of the mentioned |
| Answer» C. It holds the exhaust gases after combustion | |
| 22. |
One 'ton of refrigeration' equals how much Btu/hr. |
| A. | 14,500 Btu/hr |
| B. | 12,000 Btu/hr |
| C. | 13,000 Btu/hr |
| D. | 15,000 Btu/hr |
| Answer» C. 13,000 Btu/hr | |
| 23. |
When no.1 piston of a four cylinder in line four stroke engine is performing the power stroke, no.4 piston is on the stroke called |
| A. | Suction |
| B. | Compression |
| C. | Power |
| D. | Exhaust |
| Answer» B. Compression | |
| 24. |
Which of these is not a cylinder head type of an ic engine |
| A. | L head |
| B. | I head |
| C. | T head |
| D. | X head |
| Answer» E. | |
| 25. |
If the diameter of a piston is 'D' then the length of skirt is usually of the range of |
| A. | 0.75D to 0.8D |
| B. | 0.5D to D |
| C. | 1.5D to 2D |
| D. | 0.2D to 0.6D |
| Answer» B. 0.5D to D | |
| 26. |
The expansion process in diesel engine is |
| A. | Isothermal |
| B. | Adiabatic |
| C. | Isobaric |
| D. | None of the mentioned |
| Answer» C. Isobaric | |
| 27. |
In S.I engine the intake valve closes |
| A. | At BDC |
| B. | At TDC |
| C. | 25 degree to 84 degree after BDC |
| D. | 10 degree to 20 degree before TDC |
| Answer» D. 10 degree to 20 degree before TDC | |
| 28. |
The efficiency of a combined cycle gas turbine(steam cooled) can range as high as |
| A. | 0.2 |
| B. | 0.3 |
| C. | 0.4 |
| D. | 0.6 |
| Answer» E. | |
| 29. |
In a four stroke S.I engine the exhaust valve usually opens |
| A. | At BDC |
| B. | 35 degree to 60 degree before BDC |
| C. | 35 degree to 60 degree after BDC |
| D. | 10 degree to 20 degree before BDC |
| Answer» C. 35 degree to 60 degree after BDC | |
| 30. |
The gears on camshaft and crankshaft are known as |
| A. | Lining gears |
| B. | Aligning gears |
| C. | Timing gears |
| D. | Tuning gears |
| Answer» D. Tuning gears | |
| 31. |
A square type engine |
| A. | Has geometrically square shape |
| B. | Has two vertical and two horizontal cylinders |
| C. | Has cylinder bore equal to stroke length |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 32. |
Which one of the following is a type of Gasket |
| A. | Copper asbestos |
| B. | Steel asbestos |
| C. | Single sheet rigid |
| D. | All of the mentioned |
| Answer» E. | |
| 33. |
Which of the following item is made of aluminium alloy |
| A. | Piston ring |
| B. | Piston |
| C. | Connecting rod |
| D. | Crankshaft |
| Answer» C. Connecting rod | |
| 34. |
The angle between two cylinders in a two cylinder V-type engine is usually |
| A. | 15 degrees |
| B. | 45 degrees |
| C. | 60 degrees |
| D. | 90 degrees |
| Answer» D. 90 degrees | |
| 35. |
Gudgeon pins are made of |
| A. | Cast iron |
| B. | Aluminium |
| C. | Same material as that of piston |
| D. | Hardened and ground steel |
| Answer» D. Hardened and ground steel | |
| 36. |
In a diesel engine the pressure during combustion may increase to a range at |
| A. | 10-15 atm |
| B. | 15-20 atm |
| C. | 20-30 atm |
| D. | 55-75 atm |
| Answer» E. | |
| 37. |
Compression rings are fitted at the |
| A. | Middle of skirt |
| B. | Bottom of skirt |
| C. | Top of skirt |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 38. |
Cylinder liner materials are made of alloy iron containing |
| A. | Manganese |
| B. | Nickel |
| C. | Chromium |
| D. | All of the mentioned |
| Answer» E. | |
| 39. |
Compression rings have which type of cross section |
| A. | Rectangular |
| B. | L shaped |
| C. | Keystone |
| D. | All of the mentioned |
| Answer» E. | |
| 40. |
In the cam, the distance between the base circle and the nose is called |
| A. | Lift |
| B. | Lobe |
| C. | Flank |
| D. | Pitch |
| Answer» B. Lobe | |
| 41. |
In a Otto cycle engine, combustion occurs at |
| A. | Constant pressure |
| B. | Constant temperature |
| C. | Constant volume |
| D. | Constant heat |
| Answer» D. Constant heat | |
| 42. |
Higher efficiency in Otto cycle can be achieved by |
| A. | Increasing the compression ratio |
| B. | Decreasing the compression ratio |
| C. | Keeping the compression ratio constant |
| D. | Efficiency does not depend on compression ratio |
| Answer» B. Decreasing the compression ratio | |
| 43. |
The crankshaft should be inspected for |
| A. | Cracks |
| B. | Alignment of crankpins and journals |
| C. | Cleanliness of oil gallaries |
| D. | All of the mentioned |
| Answer» E. | |
| 44. |
Thermal power plants operate on which of these cycles |
| A. | Otto cycle |
| B. | Rankine cycle |
| C. | Carnot cycle |
| D. | Stirling cycle |
| Answer» C. Carnot cycle | |