Introduction Of Automobile — Part 1 MCQs with Explanations

A commercial vehicle with two steered axles and two driving axles is called an 8 × 4 vehicle. In the 8 × 4 configuration, the first number (8) represents the total number of wheels, and the second number (4) tells us how many of those wheels are powered by the engine (driven wheels). So, in this case, the vehicle has 8 wheels in total, with 4 of them being driven by the engine (helping the vehicle move), and the other 4 are used for steering (helping to turn the vehicle). Why the other options are incorrect: Option A: 4 × 2 means the vehicle has 4 wheels, with 2 of them being driven, and the other 2 being non-driven. This is not what we’re talking about here. Option B: 2 × 4 means 2 wheels are driven and 4 are steered, which doesn’t match the description. Option D: 4 × 8 means the vehicle has 4 wheels being driven and 8 steered, which is also incorrect for this scenario. Therefore, the correct answer is Option C: 8 × 4.

The tool employed to measure the shaft runout is the Dual gauge . Option A: Feeler gauge A feeler gauge is used to measure the gap width or clearance between two objects. It's not specifically used to measure shaft runout. Option B: Dual gauge A dual gauge, also known as a dial gauge or dial indicator, is commonly used to measure the runout or concentricity of a shaft. It provides accurate readings of any lateral movement or deviation from the true center of rotation. Option C: Micrometer A micrometer is a precision instrument used for measuring very small distances, typically with high accuracy. It's not the primary tool for measuring shaft runout. Option D: Caliper A caliper is a measuring tool used to measure the distance between two opposing sides of an object. It's not typically used for measuring shaft runout. So, the correct tool for measuring shaft runout is Option B: Dual gauge .

In a typical 4-cylinder car engine, the number of main bearings is usually Option C: 4 . Main bearings are important components in an engine that support and allow the crankshaft to rotate smoothly. The main bearings are typically located at various points along the crankshaft to provide stability and reduce friction as the engine operates.

Option A: Crown wheel and the sun gear The sun (side) gears sit inside the differential case and mesh with the planet (pinion) gears to allow left–right speed difference. Any clearance here is inherent to design/manufacturing and is not where final-drive backlash is set. Therefore, backlash is not adjusted between the crown wheel and sun gear. Option B: Sun gear and the planet gear These gears handle the differential action only. Their small clearances ensure smooth relative motion between the two axle shafts but are not adjusted as “backlash” for the final drive. No shimming or carrier movement is performed here for backlash adjustment, so this is not the correct location. Option C: Crown wheel and the drive pinion The crown wheel (ring gear) meshes directly with the drive pinion to form the final-drive gearset. The backlash is intentionally adjusted at this mesh to provide a precise tooth clearance for lubrication, thermal expansion, quiet operation, and tooth life. Mechanics set this by shifting the ring gear laterally via carrier side shims/adjusters and by setting pinion depth and bearing preload. This is the standard and correct adjustment point in differentials. Option D: Crown wheel and the planet gear The crown wheel is bolted to and drives the differential case; it does not directly mesh with the planet (pinion) gears. The planet gears mesh with the sun gears inside the case. Since there is no crown wheel–planet gear mesh, there is no backlash adjustment here. Conclusion: The adjustment for backlash in a differential is provided between the crown wheel and the drive pinion — Option C .

In the context of automobile engineering, a "Damper" is also known as a Shock absorber . The primary function of a shock absorber in a vehicle is to dampen or absorb the shocks and vibrations caused by road irregularities, providing a smoother and more comfortable ride. It helps in maintaining contact between the tires and the road surface, improving stability and handling. Option B, "Torsion bar," Option C, "Spring," and Option D, "Radius rod," are different components in an automobile suspension system and serve different purposes. None of them is synonymous with a damper or shock absorber. Therefore, the correct term for a damper in an automobile context is Shock absorber .

The correct answer is option C. Better weight distribution . In commercial vehicle layouts, the positioning of the engine forward, rear, or under the floor is mainly done to achieve better weight distribution. Weight distribution plays a crucial role in the overall performance and stability of a commercial vehicle. When the engine is located forward, it helps distribute the weight more evenly between the front and rear axles. This improves the balance of the vehicle and enhances its handling and stability, especially during cornering and braking. Alternatively, in some commercial vehicles, the engine may be located at the rear or under the floor. This configuration also helps in achieving better weight distribution by placing a significant portion of the vehicle's weight over the rear or central axles. This can provide better traction, especially in vehicles designed for off-road or heavy-duty applications. The other options mentioned in the question, such as better utilization of space, increase fuel economy, and reduce the weight of the chassis, are also important considerations in commercial vehicle design but may not be the primary reasons for determining the engine location. Hence, the correct answer is option C. Better weight distribution .

The push rod is an essential component in an internal combustion engine, especially in overhead valve (OHV) engines . It plays a crucial role in the valve actuation mechanism . Function of Push Rod: - The push rod transmits motion from the tappet (or lifter) to the rocker arm . - It helps in opening and closing the engine valves by transferring the camshaft motion. - It ensures proper valve timing and smooth engine operation. Analysis of Options: - Option A: Valve and valve spring → Incorrect , as the push rod is not directly connected to the valve spring. - Option B: Valve and rocker ram → Incorrect , because the push rod is positioned between the tappet and rocker arm , not the valve. - Option C: Tappet and rocker ram → Correct , as the push rod connects the tappet (lifter) to the rocker arm . - Option D: None of these → Incorrect , as Option C provides the correct answer. Conclusion: The correct answer is Option C: Tappet and rocker ram , as the push rod transmits motion between these two components in an engine's valve mechanism.

Light Motor Vehicle is the correct answer to “Full form of LMV is”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Chassis is the correct answer to “Vehicle without body is known as-”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

1895 is the correct answer to “First motor car race was held in . . . . . . . .”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Right hand drive is the correct answer to “Generally motor vehicle is”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

1898 is the correct answer to “The first motor car appeared in India in”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Four-cylinder in-line type is the correct answer to “Car engines are usually”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Aeroplane is the correct answer to “Which of the following is not an automobile”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Clear the engine sump and lower vehicle centre of gravity is the correct answer to “The central part of the axle beam is offset downwards to”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

All of these is the correct answer to “Electronic fuel injection system is used in engine of”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

All of the above is the correct answer to “The purpose of piston rings is to control”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Hyundai i10 is the correct answer to “The example of a hatchback is”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

All of these is the correct answer to “Catalytic converter for controlling exhaust emission is used in engine of”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Lack of balance and excessive length of propeller shaft is the correct answer to “Whirling of the propeller shafts is mainly due to”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Rear of cab to farthest rear wheel axis is the correct answer to “In a vehicle with dual rear axle, the wheel base is measured, from the”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Dissipate the energy is the correct answer to “Damper in an automobile is used to”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

One person is the correct answer to “The bucket seat can seat”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Socket type is the correct answer to “Best spanner for automobile work is the”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Hypoid drive is the correct answer to “The most popular drive at the drive axle for the passenger car is”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

I. C. engine is the correct answer to “Most commonly used power plant on automobiles is”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

All of these is the correct answer to “Which is the Indian manufacturer of trucks”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

All of these is the correct answer to “The camshaft controls”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Cornering power is the correct answer to “Cornering force divided by slip angle is called”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

All of these is the correct answer to “On the front end of a crankshaft is mounted.”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Bonnet is the correct answer to “The lid that covers the engine top in a car and situated at the front is called . . . . . . . .”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Clutch is the correct answer to “Which transmission component provides smooth take up of the drive and disengages the drive”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Gross vehicle weight is the correct answer to “In automobiles G. V. W. refers to”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Nickel chrome steel is the correct answer to “Generally valves are made from”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Brass is the correct answer to “The radiator core is generally made up of”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Kilo watt is the correct answer to “The unit of brake power is:”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Frame is the correct answer to “The basic automobile structure consists of the suspension system, axles, wheels and”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

To reduce the impact in case of low speed collisions is the correct answer to “Why 'Bumpers' are used in cars”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

0.75 is the correct answer to “The ratio of main journal diameter and the cylinder bore in a car engme is approximately”. This question is standard in competitive examination syllabi for Introduction Of Automobile.

Control the direction of expansion is the correct answer to “In autothermic pistons steel inserts are used to”. This question is standard in competitive examination syllabi for Introduction Of Automobile.