To correct heavy toe contact on ring gear teeth, move the (a) Ring gear towards pinion (b) Ring gear away from pinion (c) Drive pinion out and back lash Ans: c, 4. b) Generation of a braking effect at tight corners. The Ackermann steering layout (a) Makes for safer driving (b) Enables the driver to feel ahead position (c) Gives minimum tyre wear (d) Reduces load on the kingpins and stub axle Ans: a. Sachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college. 8. It also contributes to steering kickback or white lining. precipitate an attack of pain . In a vacuum suspended unit, when the brakes are on, the piston or diaphragm has on both sides of it, 13. b. if he performs just actions because he loves truth and liberty. (C) drying. The approximate ratio of effort applied : effort available from servo system is (a) 1:1 (b) 3:1 (c) 1:4 (d) 10:1 Ans: b, 30. Caster is defined as the inclination of (a) Front wheel to the vertical (b) The king pin axis in the fore and aft plane (c) The king pin axis in the transverse vertical plane (d) The axis of stub axle to the horizontal Ans: b. 7. Once the lower ball joint is positioned, the upper ball joint is positioned to achieve the desired balance between scrub radius, wheel centre offset and kingpin angle. In the hydraulic braking system, the piston in the master cylinder is connected by mechanical linkage to the (a) Wheel cylinders (b) Brake shoes (c) Brake pedal (d) Wheel pedal Ans: c, 15. a. D-region b. The distance between dual tyres of vehicles is to be correctly spaced to, (a) Ensure proper distribution of load between dual wheels, (c) Reduce the slippage between tyre and road while taking a turn, 45. 101 Select the correct statement. The fact that steering raises and lowers the vehicle also means that increased kingpin inclination contributes to increased steering efforts, although it is not a major contributor to the overall steering efforts. Amount: The king pin inclination in vehicles ranges from 6°to 8°.It must be equal to both sides. Understanding what caster does and how to use it is a powerful tool in the box of a suspension tuner. In trucks the system of wheel braking employed is, 28. The King pin inclination ranges from 3.5° t 8.5° & its average value is 5°. In jeeps we use (a) Mechanical brakes (b) Hydraulic brakes (c) Air brakes Ans: b, 28. As a rule when comparing the front and rear wheel cylinder pistons it will be found that the pistons in the, 9. In the integral type of power brake, the diaphragm acts directly on the hydraulic piston in the (a) Master cylinder (b) Wheel cylinder (c) Multiplier unit Ans: a, 18. More often, the condition that draws attention to trouble in the differential is, 3. In the power assisted brake system, movement of the brake pedal (a) Increases the hydraulic pressure which actuates the control valve (b) Actuates the valve in the bellows through linkage (c) Actuates the valve to admit atmospheric pressure to one side of the diaphragm Ans: c, 24. For these reasons it should be minimised. the kingpin axis intersects the ground inboard of the wheel centre line) will give a toe out tendency on a front axle when subject to a braking force. Of the four tyres on a car, the one that wears most is the (a) Right front tyre (b) Right rear tyre (c) Left front tyre (d) Left rear tyre Ans: b, 43. Power brakes in general operate making use of the pressure differential between the vacuum from the intake manifold and (a) Compressed air (b) Atmospheric pressure (c) Venturi vacuum Ans: b, 22. Since oil is a liquid it has the tendency to 'leak' through every gas/slot it finds during movement. The Impact of Independent Front Suspension Everything took a turn for the worse when independent front suspension was introduced. Good examples of more advanced suspension systems designed to minimise wheel centre offset are the ‘Revo’ knuckle on the Mk2 Ford Focus RS and ‘Super Strut’ front suspension on the ST205 Toyota Celica GT-Four. Additionally, he has interested in Product Design, Animation, and Project design. The king pin angle has an influence on the geometric variations of the wheel plan when steering and the forces transmitted to the chassis. The type of braking system referred to as power brake, makes use of (a) Electromagnets (b) Compressed air (c) Vacuum Ans: b, 10. 8) Which ionization layer exists during day time & usually vanishes at night due to highest recombination rate? Two general types of vacuum assisted power brakes are (a) Vacuum suspended and power suspended (b) Integral and pressure suspended (c) Atmospheric suspended and vacuum suspended Ans: c, 17. In the atmospheric suspended system the brakes are applied when (a) Vacuum is applied to both sides of the diaphragm (b) Atmospheric pressure is applied to both sides of the diaphragm (c) Atmospheric pressure is applied to one side of the diaphragm Ans: a, 12. Brake efficiency is a term which denotes (a) Efficiency of the braking system as a whole (b) Efficiency of the braking linings (c) The deceleration as percentage of gravity (d) Efficiency of the operating linkage Ans: c, 7. As the outside wheel is the heavily loaded wheel during cornering, this increase in positive camber acts against bump camber and will reduce the cornering capacity of the outside tyre. Learn how your comment data is processed. Hydraulic seals - Definition, Types, Diagram , Function, Failure, Application. In the vacuum suspended system, the brakes are applied when (a) Atmospheric pressure is applied to one side of the diaphragm (b) Vacuum is applied to both sides of diaphragm (c) Atmospheric pressure is applied to both sides of the diaphragm Ans: a, 11. Steering Axis Inclination) is the angle from the vertical defined by the centerline passing through the upper and lower ball joints. The king pin angle must be positive to allow a better steering feedback but should not be too high to limit the camber gain when steering. On a MacPherson strut, the kingpin axis is defined by a line passing through the strut top bearing and the lower ball joint. c. give reasons to any man. In the hydraulic braking system, the movement of the pistons in the wheel cylinder is transmitted to the, 16. 1. With a positive kingpin angle, the outside wheel in a corner will gain positive camber and the inside wheel will loose positive camber. Normal E-region c. Sporadic E-region d. Appleton region. At least 4 mm below the gingival margin c. At the cingulum of anterior t eeth d. At least 7 mm below the gingival margin e. In the floor of the mouth Key: b . The scrub radius is the lever arm for braking forces into the suspension. and 5? However, with conventional suspension systems, very low values of kinpin inclination, wheel centre offset and scrub radius result in conflicting requirements and a compromise must be reached. The distance between dual tyres of vehicles is to be correctly spaced to (a) Ensure proper distribution of load between dual wheels (b) Reduce over-steering effect (c) Reduce the slippage between tyre and road while taking a turn (d) Ensure effective braking Ans: c, 45. Explanation are given for understanding. Scrub radius is the distance from the steer axis to the centre of the tyre contact patch at ground level and wheel centre offset is the distance from the kingpin axis to the wheel centre. During braking the brake shoe is moved outward to press against the (a) Wheel piston or cylinder (b) Brake lining (c) Brake drum or disc (d) Wheel rim or axle Ans: c, 38. Caster is defined as the inclination of, (b) The king pin axis in the fore and aft plane, (c) The king pin axis in the transverse vertical plane, (d) The axis of stub axle to the horizontal, (b) Enables the driver to feel ahead position, (d) Reduces load on the kingpins and stub axle, Mechanical MCQ Objectives Question and Answers, Technical Mechanical Interview Question and Answers, Automobile Engineering Parts and System Notes , Article, Automobile Trends , News articles , Notes, Automobile Engineering Online Notes , Objective and Interview Questions, Automobile Engineering MCQ | Objective Question and Answers Part1, Automobile Engineering MCQ | Objective Question and Answers Part 2, Automobile Engineering MCQ | Objective Question and Answers Part 3, Automobile Engineering MCQ | Objective Question and Answers Part 4, Automobile Engineering MCQ | Objective Question and Answers Part 5, Automobile Engineering Interview Question and Answers Part 2, Automobile Engineering Interview Question and Answers Part 3. (B) distillation. Brake efficiency is a term which denotes, (a) Efficiency of the braking system as a whole, (c) The deceleration as percentage of gravity, 7. Excessive wheel centre offsets on front wheel drive cars or four wheel drive cars manifests itself as torque steer. Thank you For Visiting. The steer axis (or kingpin axis) on a conventional double wishbone suspension passes through the upper control arm and lower control arm ball joints. All the solutions of Coordinate Geometry - Mathematics explained in detail by experts to help students prepare for their ICSE exams. In trucks the system of wheel braking employed is (a) Mechanical (b) Hydraulic (c) Pneumatic Ans: c, 27. Q17. Since caster is not adjustable on nearly all FWD cars and usually not adjustable for many late model cars as well, we saved its discussion until now. In a differential with a gear ratio of 4 : 1 the drive pinion would revolve four times to cause the ring gear to rotate, (a) 1 time (b) 2 times (c) 4 times (d) 6 times Ans: a, 2. The pain usually last for few seconds up to a minute in the early. The Ultimate Handling Guide Part VIII: Understanding Your Caster, King Pin Inclination and Scrub. The machine operates... LearnMech.Com is a Mechanical Project-oriented platform run by Sachin Thorat who is a B-Tech Graduate in Mechanical Engineering. The toe-in which results from the negative scrub radius on the braking wheel will counteract this and improve stability. Movement of the brake pedal forces brake fluid from the master brake cylinder through brake lines and into the (a) Brake shoes (b) Wheel cylinders (c) Brakes cables (d) Pedal rod Ans: b, 37.