Automobile Engineering Interview Question and Answers Part 1

Automobile Engineering Basic Interview Question , quiz ,viva , oral Examination 

Automobile Engineering Interview Q&A :  Part 1 | Part 2 | Part 3 | Part 4 

1. What are the functions of a frame?

• To support the chassis components and the body.
• To withstand static and dynamic loads without undue deflection or distortion.
• To carry the load of the passengers or goods carried in the body.

2. List out the various materials used in the construction of chassis frames.

• Low Carbon Steel – 0.18 or 0.20 % carbon content
• High Carbon Steel – 0.25 % carbon content
• Alloy Steel – With alloying elements like Ni & Cr

3. Write down any two main sections of vehicle construction.

• Chassis construction
• Body construction

4. What are two types of vehicle suspensions?

• Rigid axle suspension
• Independent suspension

5. What loads are coming to axle?

• Vertical bending load due to vehicle weight
• Driving torque
• Braking torque
• Side thrust

6. What are the functions of a gear box?

• It has to provide torque multiplication
• It has to provide neutral position
• It has to provide the means to reverse a vehicle

7. Why you need a gear box?

When a vehicle is moving on a road, it has to encounter different resistances depending upon the road surface, vehicle speed and road gradient. Hence, wheel torque required at road wheels is different for different operating conditions. To satisfy this requirement, a gearbox is necessary in a vehicle.

Read more Gearbox Design | Machine Design- Interview Question and Answers

8. Name the different kind of resistances to vehicle motion.

• Air resistance
• Rolling resistance
• Gradient resistance

9. Why is the frame narrow at front?

• The frame is narrowed at the front to provide a better steering lock.
• This also permits smaller turning circle radius

10. List out the various materials used in the construction of vehicle body

• Wood
• Metals
• Plastics
• Mixed construction of all these materials

11. Why are the side members of the frame upswept at two places?

The frame is upswept at the rear and front to accommodate the movement of the axles due to springing. It also keeps the chassis height low.

12. What is the function of a bumper?

A bumper is the front-most or rear-most part, which is designed to allow the vehicle to sustain an impact without damage to the vehicle’s safety systems

13. What are the stresses to which the frame members are subjected to?

• Frame longitudinal members – bending stress
• Frame side members – twisting stress

14. Name few components of engine.

• Cylinder block
• Cylinder head
• Crankcase
• Cylinder
• Piston
• Connecting rod
• Crankshaft
• Camshaft
• Valves
• Spark plug (in the case of petrol engine)
• Fuel injector (in the case of diesel engine)

Read more : IC engine Major Parts and Its Function, Materials,Images,Manufacturing Method.

15. What are the types of frames?

• Ladder type frame
• Perimeter type frame
• X type frame
• Backbone type frame

16. What is meant by self-propelled vehicle?

A self propelled vehicle is known as an “Automobile”

17. List the various manufacturers of automobile products in India.

• Maruti, Hyundai, Nissan, Ford – Passenger Vehicles
• Tata, Ashok Leyland – Heavy Commercial Vehicles
• Bajaj, Hero Honda, TVS Suzuki – Two Wheelers
• Bajaj, Mahindra – Three Wheelers

18. State the major types of automobiles according to the fuel used.

• Petrol Engines (SI engines)
• Diesel Engines (CI engines)
• Gas Engines (either SI or CI mode)

19. Classify automobiles with respect to the drive of the vehicle.

• Front wheel drive
• Rear wheel drive
• All four wheel drive
• Left hand drive
• Right hand drive

20. What is meant by the term Chassis?

A complete vehicle without a body structure is known as Chassis. It comprises of basic structure, power unit, transmission system, controls and auxiliaries.

21. How automobiles are classified into different types?

• Based on Make & Model
• Based on Fuel
• Based on Body Style
• Based on No. of Wheels
• Based on Drive
• Based on Transmission

22. What are the two types of cylinder liners?

• Dry liners
• Wet liners

23. What are the functions of piston rings?

To provide a gas tight seal between the piston and cylinder liner to prevent the escape of gases from top side of the piston to the underside.

24. What are the two types of piston rings?

• Compression rings
• Oil rings

25. What are the different methods of engine cooling?

• Air cooling • Oil (or) Water cooling

26. What are the advantages of air-cooled engines?

• Less weight-power ratio
• Does not require radiator and water pump
• No antifreeze agents required
• No salt and mud deposits in the system
• Air cooled engines are cheaper

27. What are the components of water cooling method?

Water pump, radiator tube, upper tank, lower tank, thermostat valve etc.

28. State the difference between S.I and C.I engine.

29. What is clearance volume? And what are its effects?

The volume above the piston, when it reaches TDC is known as clearance volume. The clearance volume is inversely proportional to the compression ratio.

30. What is the function of piston, connecting rod, crank shaft and cylinder head?

• Piston – The piston assembly transfers the force from the power stroke to the crankshaft
• Connecting rod – converts reciprocating motion of piston into rotary motion of crankshaft
• Cylinder head – it acts as a top cover to the cylinder block. The valves are placed in the cylinder head in an overhead valve engine.

31. What is the purpose of cooling system?

The purpose of cooling system is to cool the engine components in order to keep their temperature below certain limit and thereby avoiding excessive thermal stress in those components.

32. State the merits and demerits of air and water cooling system.

Air Cooling
Merits
1. Less weight-power ratio
2. Does not require radiator and water pump
3. No antifreeze agents required
4. No salt and mud deposits in the system
5. Air cooled engines are cheaper

Demerits
1. Cooling efficiency is lower
2. Non uniform cooling
3. Engines are noisier.
4. It needs impellor or blower to blow air over the fins.

Water Cooling

Merits
1. Cooling efficiency is better
2. More uniform cooling
3. Engine operation is silent in nature
4. It does not need an impeller or blower

Demerits
1. More number of components like radiator, water pump
2. Antifreeze agents needed (Ethylene Glycol, Methanol)
3. More salt and mud deposition in the system
4. Engines are costlier

33. What is the purpose of lubricating system? State its types.

The purpose of lubrication system is to supply the lubricating oil between the moving parts of the engine in order to

1. Reduce the friction
2. Provide the cooling effect
3. carry away the deposits formed due to wear and tear.

Types: –

• Mist lubrication
• Splash lubrication
• Pressure feed lubrication
• Combined splash & pressure feed lubrication.

Read more : Engine Lubrication System | Working Principle , Types and Components

34. What is meant by turbo charging?

Increasing the density of inducted charge/air by using a compressor which gets its power from exhaust driven turbine is known as Turbo charging.

35. What are the various pollutants in I.C engine?

• HC
• CO
• NOx
• Particulates
• SO2
• CO2

36. What is meant by P.C.V? And what are its effects?

PCV – Positive Crankcase Ventilation
It is used to reduce the blow-by and thereby unburned hydrocarbon emissions

37. What is a Catalyst?

Catalyst is a chemical substance which increases the rate of chemical reaction. Examples are Platinum, Palladium and Rhodium.

38. Write down the firing order a 4 cylinder and 6 cylinder engine

4 cylinder engine firing order: 1-4-3-2
6 cylinder engine firing order: 1-5-3-6-2-4

Read More : Firing Order | Purpose , Firing order Of Different Engine

Automobile Engineering Interview Q&A :  Part 1 | Part 2 | Part 3 | Part 4 

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