Braking System — Part 1 MCQs with Explanations

$$ \begin{aligned} \textbf{Given:}\;& L=4\,\text{m},\; h=0.8\,\text{m},\; d_{\text{rear}}=1.2\,\text{m},\; \mu=0.8 \\[4pt] \text{Front axle distance:}\;& L-d_{\text{rear}}=2.8\,\text{m} \\[6pt] \textbf{Concept:}\;& \text{Front-wheel braking; force limited by front-axle load} \\[6pt] \text{Static front-axle load:}\;& W_f=W\frac{d_{\text{rear}}}{L}=0.3W \\[4pt] \text{Max braking force:}\;& F_{\max}=\mu W_f=0.3\mu W \\[4pt] \text{Retardation:}\;& a=\frac{F_{\max}}{m}=0.3\mu g \\[4pt] & a=0.8\times0.3\times9.81\approx2.35\,\text{m/s}^2\approx2.4\,\text{m/s}^2 \\[6pt] & \boxed{\text{Answer: } 2.4\,\text{m/s}^2\;(\text{Option B})} \end{aligned} $$

Flushing is the process of completely removing the old brake fluid from the hydraulic braking system and replacing it with fresh brake fluid. Brake fluid can absorb moisture and contaminants over time, which may reduce braking efficiency and cause corrosion inside the brake components. Bleeding is different because it mainly refers to removing trapped air bubbles from the brake lines, not completely replacing all the fluid. Therefore, the correct answer is Flushing .

The correct answer is Option D: All of the above . Explanation: Let's go through each option to understand how the power brake can be exerted: A. Electrical energy: Some modern vehicles use electrically assisted braking systems, where electrical energy is used to enhance braking force. This can be achieved through technologies like regenerative braking or electrically operated brake boosters. B. Engine vacuum: Many vehicles utilize engine vacuum to assist in applying the brakes. This is commonly known as a vacuum booster or vacuum-assisted brake system. The engine's vacuum creates a pressure differential, which helps in applying the brakes with less pedal effort. C. Air pressure: Air pressure is commonly used in large commercial vehicles, such as trucks and buses, for their braking systems. These vehicles use an air brake system, where compressed air is used to exert force on the brake mechanisms. Therefore, as all of the options mentioned in the question (electrical energy, engine vacuum, and air pressure) can be utilized to exert power for the brake system, the correct answer is Option D: All of the above .

Anti-lock braking system is the correct answer to “What is meant by ABS”. This question is standard in competitive examination syllabi for Braking System.

A compressor is the correct answer to “In the air brake, air pressure is supplied by”. This question is standard in competitive examination syllabi for Braking System.

All are correct is the correct answer to “Which of the following is a type of brake”. This question is standard in competitive examination syllabi for Braking System.

Two cylinders and two reservoirs is the correct answer to “Tandem master cylinder consists of”. This question is standard in competitive examination syllabi for Braking System.

Axle is the correct answer to “In disc brake, the disc is attached to the”. This question is standard in competitive examination syllabi for Braking System.

All are correct is the correct answer to “What is the cause of noisy brakes fault”. This question is standard in competitive examination syllabi for Braking System.

Slide outward of the seal and take new position closer to the disc is the correct answer to “Disk brakes self-adjust when lining wear allows the piston to . . . . . . . .”. This question is standard in competitive examination syllabi for Braking System.

Brake shoes is the correct answer to “Breaking is produced by the frictional effect between the brake drum and”. This question is standard in competitive examination syllabi for Braking System.

Enhances safety by serving two independent lines in a divided-line brake circuit is the correct answer to “The advantage of a tandem master cylinder is that it”. This question is standard in competitive examination syllabi for Braking System.

Air is the correct answer to “The brake bleeding process removes . . . . . . . . from the hydraulic brake system.”. This question is standard in competitive examination syllabi for Braking System.

Both A and B is the correct answer to “Following is (are) the type(s) of shape(s) for the pads of caliper disk brakes”. This question is standard in competitive examination syllabi for Braking System.

Steel is the correct answer to “Vacuum tank is connected to the valve of brake booster through a . . . . . . . . pipe”. This question is standard in competitive examination syllabi for Braking System.

The amplification of braking forces is the correct answer to “Servo action is to”. This question is standard in competitive examination syllabi for Braking System.

Bleeding is the correct answer to “Removal of air bubbles present in the braking system is called”. This question is standard in competitive examination syllabi for Braking System.

False is the correct answer to “The heat dissipates quickly in drum brakes than that in disc brakes.”. This question is standard in competitive examination syllabi for Braking System.

8.75 m/s2 is the correct answer to “The car is moving up on the 12o inclined road with horizontal at 36 km/h which is having wheelbase 1.4 m. The C. G. of the car is 0.9 m above the road. The coefficient of friction is 0.7. What is the retardation of the car if the brakes are applied to all the four wheels”. This question is standard in competitive examination syllabi for Braking System.

3.7 m/s2 is the correct answer to “If the car is moving on the level road at a speed of 50 km/h has a wheelbase 3 m, a distance of C.G. from ground 700 mm and distance from rear wheels is 1.1 m. Coefficient of friction is 0.7. What is the retardation if the brakes are applied to the rear wheels”. This question is standard in competitive examination syllabi for Braking System.

Cast aluminium having cast iron bonded fins is the correct answer to “The most suitable material for a brake drum is”. This question is standard in competitive examination syllabi for Braking System.

One leading, one trailing shoe is the correct answer to “Select the better arrangement of shoes for manually operated hydraulic brake system”. This question is standard in competitive examination syllabi for Braking System.

Fully depressed is the correct answer to “In what position should the brake pedal be kept when a bleed screw is loosened”. This question is standard in competitive examination syllabi for Braking System.

Steel is the correct answer to “The brake pipes in hydraulic brake system are made of”. This question is standard in competitive examination syllabi for Braking System.

All of the above is the correct answer to “The function of master cylinder in hydraulic brakes is to”. This question is standard in competitive examination syllabi for Braking System.

To decelerate the automobile is the correct answer to “Which of the following phrases correctly describes the function of the brake”. This question is standard in competitive examination syllabi for Braking System.

10 - 30% is the correct answer to “Desired slip rate in case of ABS of a road vehicle is:”. This question is standard in competitive examination syllabi for Braking System.

More is the correct answer to “Aluminium conducts . . . . . . . . heat than cast iron.”. This question is standard in competitive examination syllabi for Braking System.

Mechanical is the correct answer to “The parking brakes fall into which of the following classifications”. This question is standard in competitive examination syllabi for Braking System.

Brake shoes is the correct answer to “Braking is produced by the frictional contact between the brake drum and”. This question is standard in competitive examination syllabi for Braking System.

It maintains directional control during braking by preventing the wheels from locking is the correct answer to “The role of antilock brake system (ABS) is that”. This question is standard in competitive examination syllabi for Braking System.

Larger is the correct answer to “The pistons in the front wheel cylinders as compared to those in rear wheel cylinders in hydraulic brake system are”. This question is standard in competitive examination syllabi for Braking System.

Bleeding is the correct answer to “The process of removing air from the brake system is known as”. This question is standard in competitive examination syllabi for Braking System.

T is the correct answer to “. . . . . . . . section is the cross-section of the brake shoe”. This question is standard in competitive examination syllabi for Braking System.

4.76 m/s2 is the correct answer to “The car is moving down on the 14° inclined road with horizontal at 36 km/h which is having wheelbase 1.4 m. The C. G. of the car is 0.9 m above the road. The coefficient of friction is 0.75. What is the retardation of the car if the brakes are applied to all the four wheels”. This question is standard in competitive examination syllabi for Braking System.

DOT 4 fluid has a higher boiling point the DOT 3 fluid is the correct answer to “The difference between DOT 3 and DOT 4 fluid is that the”. This question is standard in competitive examination syllabi for Braking System.

Disk brake is the correct answer to “Following brake can never become self-locking”. This question is standard in competitive examination syllabi for Braking System.

It increases and decreases the hydraulic pressure is the correct answer to “The function performed by the modulator during ABS operation is that”. This question is standard in competitive examination syllabi for Braking System.

Both are correct is the correct answer to “What is the cause of brake pedal spongy fault”. This question is standard in competitive examination syllabi for Braking System.

Both are correct is the correct answer to “Which type of brakes are filled in vehicle”. This question is standard in competitive examination syllabi for Braking System.