Question Bank - Most important exam questions with answers asked in automobile engineering

Important questions with answers for automobile engineering subject

 

Dear students, below questions are collected from various board exam papers. I hope it may helps to get better score

1. Define scavenging.

Scavenging is the process of clearing off the burnt gases from combustion chamber after the expansion process and replacing them with fresh charge to start another cycle.

2. Write the demerits of two stroke engine

• Fuel consumption is more and thermal efficiency less
• It produces high amount of emissions like CO, UBHC, CO₂ etc.,
• Volumetric efficiency is less

3. What are the types of gear boxes?

Gear boxes are generally classified as

• Sliding mesh gear box
• Constant mesh gear box
• Synchromesh gear box

4. Name the controls on handle bar.

• Right handle bar controls
• Head light switch
• Starter button

• Left handle bar controls

• Head light dimmer switch

• Passing control switch

• Turn signal switch

• Horn button

5. State the functions of brake

• To stop the vehicle quickly with in the shortest possible distance.
• To slow down or stop the motion of a moving vehicle

6. Mention the common causes for tyre wear

• Under-inflation
• Over-inflation
• Wheel misalignment
• More heat

7. What is race vehicle?

    Race vehicle is a very fast vehicle that is used for race competition. The specification of vehicle is governed by rules of the racing.

8. Write any two daily inspection of two wheeler.

• Check the fuel level
• Check the type pressure
• Check the operations of lights, horns, switches
• Check the clutch and brake cables

9. Name any two periodic check- ups followed in three wheelers.

• Check the lubricating oil level
• Check chain play, wheel nut tight
• Check lights for their operations
• Clean air filter

10. Write few applications of three wheelers.

Three wheelers are extensively used to carrying passengers as well as goods like fruits, vegetables, milk canes, LPG gas cylinders, Paints, Electrical and electronics items.

11. What is the function of fuel feed pump?

The purpose of the fuel feed pump is to draw the fuel from the fuel tank to the carburetor or fuel injection pump through fuel filter under certain pressure.

12. Define spark ignition engine.

When the combustion of fuel takes place due to the spark produced by the spark plug, then the engine is said to be spark ignition engine.

13. What do you mean by self-starter mechanism?

Self-starter mechanism is used to crank the engine flywheel. The starter motor is linked to the engine fly wheel through a set of gears. A pinion gear is attached to the starter motor armature which drives a ring gear attached to the fly wheel.

14. What is main frame?

The frame is the skeleton or backbone of the vehicle. The main function is to provide a non-flexible mount to carry the rider and all the various components of the vehicle.

15. Why shock absorbers are used in suspension system?

When the vehicle moves in irregular roads the spring assembly moves in up or down direction. The spring does not come to its original position immediately and causing vibrations. To control the spring movement shock absorbers are used.

16. What is cast wheel?

It is made up of aluminum or magnesium alloys. Cast wheels are mostly used in cars and two wheelers. The alloy cast wheel is light in weight compared to steel disc wheel.

17. What is meant by overhauling?

Overhauling is a general process consists of cleaning, inspection, diagnosis, re adjustment and tuning up of an assembly or part. Example: engine overhauling

18. What are the types of lubrication systems?

• Petroil or mist lubrication system

• Wet sump pressure lubrication system

• Dry sump pressure lubrication system

19. What is scavenging efficiency?

Scavenging efficiency can be defined as the ratio of the volume of air in the cylinder at the start of the compression to the volume swept by the piston from the top edge of the ports to the top of the strokes. 

20. Mention the function and types of frames

The main function is to provide a non-flexible mount to carry the rider and all the various components of the vehicle. 

Types of frames

• Diamond frame
• Cradle frame
• Back bone frame
• Underbone frame
• Trellis frame

21. Compare drum and disk brake.                                                                               

S.No	Disc brake	Drum brake
1	These provide more cooling effect than drum brakes.	These provide lesser cooling effect than disc brakes.
2	Braking efficiency is much higher than drum brakes.	Braking efficiency is lower than disc brakes.
3	It is mostly used in light vehicles.	It is mostly used in heavy duty vehicles.
4	Friction surface are directly exposed to atmospheric air	Friction occurs on the internal surface

          

22. Write any one case study of a two wheeler

• Motor cycle: Example
• Make: Hero Motors Model: Splendor
• Engine: Four stroke Air cooled with100cc displacement volume OHC valve arrangement
• Clutch: Multiplate wet clutch
• Gear box: Four speed
• Electrical system: 12V

23. List the advantages of good maintenance

• Reduce the breakdown of vehicle
• Increased safety due to reduced breakdown
• Less expenses on repairs
• Increase the life of vehicle

24. What is the procedure to start the vehicle?

• Do preliminary checks such as fuel level, no leakage of oils, tyre pressure etc
• Setting the gear in neutral position
• Crank the engine by kick starter or self start

25. Distinguish pickup and delivery van   

S.No	Pickup van	Delivery van
1	It has higher load carrying capacity	Load carrying capacity of these vehicles is less than other types of vehicle
2	Pickup vans are generally used to carry passengers or for carrying goods	These vehicles are used to transfer light weight goods
3	It has larger cabin	It has smaller cabin
4	The drivers cockpit is provided with doors	The drivers cockpit may be provided with doors