The function performed by the modulator during ABS operation is that
A. It increases and decreases the hydraulic pressure
B. It balances the front wheel and rear wheel braking forces
C. It determines which wheel is about to lock in accordance with signals from the wheel speed sensors
D. It transmits wheel speed sensor signal to the control module
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What is the cause of brake pedal spongy fault?
A. Air in hydraulic system
B. Improper brake oil
C. Both are correct
D. None of these
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Which type of brakes are filled in vehicle?
A. Service brakes
B. Auxiliary brakes
C. Both are correct
D. None of these
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The following is not a drum brake
A. External contracting brake
B. Internal expanding brake
C. Disc brake
D. All of the above
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What is the principle on which brakes work?
A. Vibration
B. Friction
C. Suction
D. Dragging
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A braking torque of 2 kN-m is applied on a machine member to reduce the speed from 2000 rpm to 500 rpm in 10 sec. The specific heat of the brake material is 500 J/kg °C. The temperature rise for the brake per unit mass during braking period is
A. 45°C
B. 34°C
C. 109.4°C
D. 91.3°C
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The service brakes employed in cars are usually operated
A. Mechanically
B. Hydraulically
C. By means of engine vacuum
D. By compressed air
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The main component of air pressure brake is
A. Air compressor
B. Slack adjuster
C. Air tank
D. All are correct
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The following factor(s) contribute to the effectiveness of the brakes
A. Area of brake linings
B. Radius of car wheel
C. Amount of pressure applied to shoe brakes
D. All of the above
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What is the braking torque at leading shoe if resultant frictional force acts at a distance of 250 mm from the brake drum center, coefficient of friction between the shoe and the drum as 0.5, the free ends of the two shoes are pushed apart with a force of 300 N which is acting at a distance of 320 mm from anchor, and two shoes are anchored together 170 mm away from the brake drum center?
A. 276.6 Nm
B. 256.6 Nm
C. 266.6 Nm
D. 246.6 Nm
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In an automotive brake system, balance between front and rear braking is ensured with the help of:
A. Master cylinder
B. Proportioning valve
C. Metering valve
D. Differential switch
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Which type of braking system is used on aircraft?
A. Pneumatic
B. Hydraulic
C. Mechanical
D. None of these
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Which of the following brakes is commonly used in motor cars?
A. Band brake
B. Shoe brake
C. Internal expanding shoe brake
D. All of the above
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The power brake may be exerted by
A. Electrical energy
B. Engine vacuum
C. Air pressure
D. All of the above
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As compared to drum brakes, disc brakes has
A. Same resistance to fade
B. High resistance to fade
C. Lower resistance to fade
D. No resistance to fade
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The parking brake usually operates on
A. Front wheels
B. Rear wheels
C. Left wheels
D. All the wheels
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If the car is moving on the level road at a speed of 50 km/h has a wheelbase 4 m, a distance of C. G. from ground 800 mm and distance from rear wheels is 1.2 m. Coefficient of friction is 0.8. What is the retardation if the brakes are applied to all wheels?
A. 7.8 m/s2
B. 6.8 m/s2
C. 5.8 m/s2
D. 4.8 m/s2
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The ventilated disc brake is a disc brake in which
A. A duct directs air towards the caliper for cooling while the vehicle is moving
B. Caliper is covered with cooling fins
C. Disc contains many small holes for optimum cooling performance
D. Disc contains radial vanes between its rubbing surfaces for optimum cooling performance
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The sequence in which the force is transmitted through front brakes in a hydraulic brake system is
A. Brake pedal - Master cylinder - Brake lines - Brake booster - Brake calipers
B. Brake pedal - Brake booster - Master cylinder - Brake lines - Brake calipers
C. Brake pedal - Master cylinder - Brake booster - Brake lines - Brake calipers
D. Brake pedal - Brake lines - Brake booster - Master cylinder - Brake calipers
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Which of the following phenomenon occurs during braking action?
A. Conversion of heat energy to kinetic energy
B. Conversion of kinetic energy to heat energy
C. Accumulation of energy
D. none of the above
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