Question 1:
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
Answer: _________
Question 2:
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
Answer: _________
Question 3:
Which type of brakes are filled in vehicle?
A.
Service brakes
B.
Auxiliary brakes
C.
Both are correct
D.
None of these
Answer: _________
Question 4:
The following is not a drum brake
A.
External contracting brake
B.
Internal expanding brake
C.
Disc brake
D.
All of the above
Answer: _________
Question 5:
What is the principle on which brakes work?
A.
Vibration
B.
Friction
C.
Suction
D.
Dragging
Answer: _________
Question 6:
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
Answer: _________
Question 7:
The service brakes employed in cars are usually operated
A.
Mechanically
B.
Hydraulically
C.
By means of engine vacuum
D.
By compressed air
Answer: _________
Question 8:
The main component of air pressure brake is
A.
Air compressor
B.
Slack adjuster
C.
Air tank
D.
All are correct
Answer: _________
Question 9:
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
Answer: _________
Question 10:
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
Answer: _________
Question 11:
Aluminium conducts . . . . . . . . heat than cast iron.
A.
More
B.
Less
C.
Equal
D.
None of these
Answer: _________
Question 12:
The parking brakes fall into which of the following classifications?
A.
Mechanical
B.
Pneumatic
C.
Hydraulic
D.
Air-over-hydraulics
Answer: _________
Question 13:
Braking is produced by the frictional contact between the brake drum and
A.
Brake shoe return spring
B.
Wheel cylinders piston
C.
Expanding cam
D.
Brake shoes
Answer: _________
Question 14:
The role of antilock brake system (ABS) is that
A.
It reduces the vehicle's stopping distances
B.
It minimizes brake fade
C.
It maintains directional control during braking by preventing the wheels from locking
D.
It prevents nose dives during braking and thereby postpones locking of the wheels
Answer: _________
Question 15:
The pistons in the front wheel cylinders as compared to those in rear wheel cylinders in hydraulic brake system are
A.
Larger
B.
Smaller
C.
Of the same size
D.
None of the above
Answer: _________
Question 16:
The process of removing air from the brake system is known as
A.
Bleeding
B.
Self energizing
C.
Servo action
D.
Energization
Answer: _________
Question 17:
. . . . . . . . section is the cross-section of the brake shoe?
A.
X
B.
Y
C.
Z
D.
T
Answer: _________
Question 18:
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?
A.
4.76 m/s 2
B.
5.76 m/s 2
C.
6.76 m/s 2
D.
7.76 m/s 2
Answer: _________
Question 19:
The difference between DOT 3 and DOT 4 fluid is that the
A.
DOT 4 fluid has a higher boiling point the DOT 3 fluid
B.
DOT 3 fluid has a higher boiling point than DOT 4 fluid
C.
DOT 3 and dot 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life
D.
DOT 4 fluid is more resistant to freezing than DOT 3 fluid
Answer: _________
Question 20:
Following brake can never become self-locking
A.
Disk brake
B.
Block brake
C.
Band brake
D.
All of the above
Answer: _________
Question 21:
In vacuum booster servo assisted hydraulic brake, vacuum is developed
A.
In the inlet manifold
B.
In the outlet manifold
C.
In the crankcase
D.
None of these
Answer: _________
Question 22:
The main function of a master cylinder is that it
A.
Adjusts the extent of brake pedal play
B.
Boosts the force applied to the brake pedal
C.
Converts the brake pedal force into hydraulic pressure
D.
Ensures that all the wheel brakes are supplied with the same amount of fluid pressure
Answer: _________
Question 23:
When the hydraulic brake pedal is pressed by the driver and feels 'spongy' it indicates that-
A.
Brake shoe clearance is excessive
B.
System contains air
C.
System is in good condition
D.
Brake fluid require change
Answer: _________
Question 24:
Bleeder valve is the valve fitted on wheel cylinders for forcing air out of the braking system
A.
Correct
B.
Incorrect
C.
Both are correct
D.
None of these
Answer: _________
Question 25:
What is the remedy of the cause fault 'Air in hydraulic system'?
A.
Bleed the system
B.
Adjust brake pedal
C.
Use brake oil
D.
All are correct
Answer: _________
Question 26:
If the brake efficiency is 70%, then the braking quality is said to be
A.
Fair
B.
Very good
C.
Good
D.
Poor
Answer: _________
Question 27:
What is the cause of the fault 'insufficient braking'?
A.
Insufficient air in the system
B.
Brake shoes worn out
C.
Brakes require re-adjusting
D.
All are correct
Answer: _________
Question 28:
The most effective braking system for a four wheeled vehicle will have
A.
All wheels braking
B.
Front wheel braking
C.
Real wheels braking
D.
Front wheels braking if the front wheel is the drive axle
Answer: _________
Question 29:
In disc brakes, pad-to-disc adjustment is provided by
A.
Caliper
B.
Piston
C.
Piston seal
D.
Bleed screw
Answer: _________
Question 30:
The mechanical brakes are operated by means of
A.
Levers
B.
Bell cranks
C.
Cams
D.
All of the above
Answer: _________
Question 31:
Hydraulic brakes function on the principle of
A.
Law of conservation of momentum
B.
Law of conservation of energy
C.
Pascal's law
D.
None of the above
Answer: _________
Question 32:
The advantage of a tandem master cylinder is that it
A.
Enhances safety by serving two independent lines in a divided-line brake circuit
B.
Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss
C.
Supplies equal fluid pressures to each line of a divided-line brake circuit, thereby preventing the brakes from dragging on one side
D.
Increases the brake fluid pressure to reduce the force required to depress the brake pedal
Answer: _________
Question 33:
The brake bleeding process removes . . . . . . . . from the hydraulic brake system.
A.
Air
B.
Vacuum
C.
Excess fluid
D.
Excess pressure
Answer: _________
Question 34:
Following is (are) the type(s) of shape(s) for the pads of caliper disk brakes
A.
Circular
B.
Annular
C.
Both A and B
D.
None of the above
Answer: _________
Question 35:
Vacuum tank is connected to the valve of brake booster through a . . . . . . . . pipe?
A.
Rubber
B.
Steel
C.
Copper
D.
None of these
Answer: _________
Question 36:
Servo action is to
A.
The amplification of braking forces
B.
Increase force of friction between shoe and wheel
C.
Transfer of weight during stop
D.
All of the above
Answer: _________
Question 37:
During braking, the brake shoe is moved outward to force the lining against the
A.
Wheel piston or cylinder
B.
Anchor pin
C.
Brake drum
D.
Wheel rim or axle
Answer: _________
Question 38:
Removal of air bubbles present in the braking system is called
A.
Blooding
B.
Bleeding
C.
Tunning
D.
None of these
Answer: _________
Question 39:
The process of removing all of the old brake fluid from the hydraulic system is called
A.
Bleeding
B.
Cleaning
C.
Changing
D.
Flushing
Answer: _________
Question 40:
The heat dissipates quickly in drum brakes than that in disc brakes.
A.
True
B.
False
Answer: _________
Question 41:
Hand brake is applicable to
A.
Only front wheels
B.
Only rear wheels
C.
Both front and rear wheels
D.
All of the above
Answer: _________
Question 42:
How does the brake pedal behave during ABS operation?
A.
It is pushed upwards forcefully
B.
It transmits slight kickback to the drivers foot
C.
The pedal stroke becomes longer
D.
Nothing happens
Answer: _________
Question 43:
Generally which brakes are on the front wheels?
A.
Drum brake
B.
Disk brake
C.
Shoe brake
D.
Double shoe brake
Answer: _________
Question 44:
The force required to stop a vehicle is dependent on
A.
The weight of vehicle
B.
The deceleration rate
C.
Both A and B
D.
None of the above
Answer: _________
Question 45:
The component of the wheel cylinder which seals the brake fluid is
A.
Piston
B.
Spring
C.
Dust cover
D.
Cup
Answer: _________
Question 46:
Band brakes are used in
A.
Chain saws
B.
Hoists
C.
Bucket conveyors
D.
All of the above
Answer: _________
Question 47:
What is the remedy of the cause 'worn out brake linings'?
A.
Adjust brake lining or fit new lining
B.
Bleed the brake system
C.
Adjust the brake shoe
D.
All are correct
Answer: _________
Question 48:
In the disc brake, the disc is attached
A.
To the piston
B.
To the caliper
C.
To the wheel hub
D.
To the steering knucle
Answer: _________
Question 49:
Fading of brakes occurs . . . . . . . .
A.
At high speed
B.
At low speed
C.
During continuous application
D.
When brake lining is worn out
Answer: _________
Question 50:
The oldest braking system used on any automobile is
A.
Mechanical braking on front wheels only
B.
Engine exhaust braking system
C.
Vacuum pump controlled braking system
D.
Girling braking system
Answer: _________
Question 51:
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?
A.
8.75 m/s 2
B.
8.81 m/s 2
C.
7.71 m/s 2
D.
6.81 m/s 2
Answer: _________
Question 52:
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?
A.
3.7 m/s 2
B.
2. 7 m/s 2
C.
1.7 m/s 2
D.
4.7 m/s 2
Answer: _________
Question 53:
The most suitable material for a brake drum is
A.
Cast aluminium having cast iron bonded fins
B.
Cast iron
C.
Cast iron having aluminium bonded fins
D.
Aluminium
Answer: _________
Question 54:
Select the better arrangement of shoes for manually operated hydraulic brake system
A.
One leading, one trailing shoe
B.
Both leading shoes
C.
Both trailing shoes
D.
Any of the arrangement
Answer: _________
Question 55:
In what position should the brake pedal be kept when a bleed screw is loosened?
A.
Slightly depressed
B.
Depressed half-way
C.
Fully depressed
D.
Fully released
Answer: _________
Question 56:
The brake pipes in hydraulic brake system are made of
A.
Rubber
B.
Steel
C.
Pvc
D.
Aluminium
Answer: _________
Question 57:
The function of master cylinder in hydraulic brakes is to
A.
Builds up hydraulic pressure to operate the brakes
B.
Maintains constant volume of fluid in the system
C.
Serves as a pump to force air out of the hydraulic system
D.
All of the above
Answer: _________
Question 58:
In a disc brake, which component provides the pad-to-disc adjustment?
A.
Bleed screw
B.
Piston
C.
Caliper
D.
Piston seal
Answer: _________
Question 59:
Which of the following phrases correctly describes the function of the brake?
A.
To change speed
B.
To stop in emergency
C.
To couple the engine to the road wheels
D.
To decelerate the automobile
Answer: _________
Question 60:
Desired slip rate in case of ABS of a road vehicle is:
A.
0%
B.
10 - 30%
C.
100%
D.
80 - 90%
Answer: _________
Question 61:
What is meant by ABS?
A.
Avoid brake system
B.
Actual brake system
C.
Anti-lock braking system
D.
Automatic brake system
Answer: _________
Question 62:
In the air brake, air pressure is supplied by
A.
The engine manifold
B.
A compressor
C.
The diaphragm valve
D.
A condensor
Answer: _________
Question 63:
What is the cause of poor braking?
A.
Wet brake lining
B.
Burntor worn out linings
C.
Both are correct
D.
None of the above
Answer: _________
Question 64:
What is the function of brake lining?
A.
To increase the co-efficient of friction
B.
To prevent wearing away of the metal
C.
Both are correct
D.
None of the above
Answer: _________
Question 65:
Which of the following is a type of brake?
A.
Air pressure brake
B.
Hydraulic disc brake
C.
Vacuum assisted brake
D.
All are correct
Answer: _________
Question 66:
Tandem master cylinder consists of
A.
One cylinder and one reservoir
B.
Two cylinders and one reservoir
C.
One cylinder and two reservoirs
D.
Two cylinders and two reservoirs
Answer: _________
Question 67:
In disc brake, the disc is attached to the
A.
Wheel
B.
Axle
C.
Suspension system
D.
None of the above
Answer: _________
Question 68:
What is the cause of noisy brakes fault?
A.
Bent back plate
B.
Dirty lining
C.
Drum distorted
D.
All are correct
Answer: _________
Question 69:
Disk brakes self-adjust when lining wear allows the piston to . . . . . . . .
A.
Slide outward of the seal and take new position closer to the disc
B.
Slide inward of the seal and take new position closer to the disc
C.
Slide both sides of the seal and take new position closer to the disc
D.
None of the above
Answer: _________
Question 70:
Breaking is produced by the frictional effect between the brake drum and
A.
Wheel cylinder piston
B.
Brake shoes
C.
Wheel studs
D.
Wheel rim
Answer: _________
Question 71:
On what principle does the braking system in the car work?
A.
Frictional force
B.
Gravitational force
C.
Magnetic force
D.
Electric force
Answer: _________
Question 72:
The hand brake of the automobile is usually
A.
External contracting brake
B.
Internal expanding brake
C.
Disc brake
D.
All of the above
Answer: _________
Question 73:
ABS function requires measurement of
A.
Wheel rotation
B.
Torque
C.
Temperature
D.
Camber
Answer: _________
Question 74:
The function of unloader valve is to
A.
Relieve the pressure of air in the reservoir
B.
Filter the air
C.
Relieve the load on the compressor
D.
None of the above
Answer: _________
Question 75:
Requirements of a good braking system is
A.
Brake should have less wearing parts
B.
Brakes should work equally good in all weathers
C.
Both are correct
D.
None of the above
Answer: _________
Question 76:
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
D.
None of the above
Answer: _________
Question 77:
In vacuum brake, cylinder chamber consists of
A.
Atmospheric valve
B.
Vacuum valve
C.
Both A and B
D.
None of the above
Answer: _________
Question 78:
The brake shoes are curved to conform to the inner diameter of the
A.
Tyre
B.
Wheel
C.
Pedal
D.
Brake drum
Answer: _________
Question 79:
If a force of 10 units is applied to the master cylinder of an automotive brake system which uses wheel cylinder piston of 5 square units surface area, then the output force at wheels will be
A.
10 units
B.
15 units
C.
50 units
D.
Cannot be estimated
Answer: _________
Question 80:
In hydraulic brake system, the movement of the piston in the master cylinder produces hydraulic pressure which causes movement of the
A.
Brake shoe
B.
Brake pedal
C.
Brake cam
D.
None of these
Answer: _________
Question 81:
The main component of vacuum servo brake is
A.
Exhauster
B.
Vacuum tank
C.
Vacuum booster
D.
All are correct
Answer: _________
Question 82:
The metering valve is used to proportion the braking effect between the front and the rear axle.
A.
True
B.
False
Answer: _________
Question 83:
The brake system which is the most efficient among the given, is
A.
Mechanical brake system
B.
Hydraulic brake system
C.
Vacuum servo brake system
D.
Air brake system
Answer: _________
Question 84:
The condition that causes vapour locking in a brake system is
A.
Overheating of the fluid due to frequent brake application
B.
Over cooling of the brakes during high speed driving
C.
Keeping the vehicle without use for an extended period
D.
An excessively high engine speed on a downhill road
Answer: _________
Question 85:
When Brake is applied the kinetic energy of a body is converted into-
A.
Mechanical energy
B.
Potential energy
C.
Electrical energy
D.
Chemical energy
Answer: _________
Question 86:
. . . . . . . . mostly used for the braking surface.
A.
Steel
B.
Cast iron
C.
Copper
D.
Aluminium
Answer: _________
Question 87:
The brake lining consists mainly of
A.
Asbestos
B.
Copper
C.
Cast iron
D.
Aluminium
Answer: _________
Question 88:
The torque capacity (Mt) of disk brake is given by
A.
μPRf
B.
μ/PRf
C.
μP/Rf
D.
μRf/P
Answer: _________
Question 89:
What is the factor that tend to increase brake temperature?
A.
Load on vehicle
B.
Speed of vehicle
C.
Unbalanced braking
D.
All are correct
Answer: _________
Question 90:
The brake bleeding process removes . . . . . . . . from system.
A.
Air
B.
Vacuum
C.
Excess fluid
D.
Excess pressure
Answer: _________
Question 91:
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
Answer: _________
Question 92:
Which type of braking system is used on aircraft?
A.
Pneumatic
B.
Hydraulic
C.
Mechanical
D.
None of these
Answer: _________
Question 93:
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
Answer: _________
Question 94:
The power brake may be exerted by
A.
Electrical energy
B.
Engine vacuum
C.
Air pressure
D.
All of the above
Answer: _________
Question 95:
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
Answer: _________
Question 96:
The parking brake usually operates on
A.
Front wheels
B.
Rear wheels
C.
Left wheels
D.
All the wheels
Answer: _________
Question 97:
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/s 2
B.
6.8 m/s 2
C.
5.8 m/s 2
D.
4.8 m/s 2
Answer: _________
Question 98:
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
Answer: _________
Question 99:
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
Answer: _________
Question 100:
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
Answer: _________
Question 101:
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 the front wheels?
A.
3.4 m/s 2
B.
2.4 m/s 2
C.
1.4 m/s 2
D.
4.4 m/s 2
Answer: _________
Question 102:
When brakes are applied on a moving vehicle
the kinetic energy is converted to
A.
Mechanical energy
B.
Heat energy
C.
Electrical energy
D.
Potential energy
Answer: _________
Answer Key
1:
A
2:
C
3:
C
4:
C
5:
B
6:
D
7:
B
8:
D
9:
D
10:
C
11:
A
12:
A
13:
D
14:
C
15:
A
16:
A
17:
D
18:
A
19:
A
20:
A
21:
A
22:
C
23:
B
24:
A
25:
A
26:
B
27:
D
28:
A
29:
C
30:
D
31:
C
32:
A
33:
A
34:
C
35:
B
36:
A
37:
C
38:
B
39:
A
40:
B
41:
B
42:
B
43:
B
44:
C
45:
D
46:
D
47:
A
48:
C
49:
B
50:
B
51:
A
52:
A
53:
A
54:
A
55:
C
56:
B
57:
D
58:
D
59:
D
60:
B
61:
C
62:
B
63:
C
64:
C
65:
D
66:
D
67:
B
68:
D
69:
A
70:
B
71:
A
72:
A
73:
A
74:
C
75:
C
76:
A
77:
C
78:
D
79:
C
80:
A
81:
D
82:
B
83:
C
84:
A
85:
A
86:
B
87:
A
88:
A
89:
D
90:
A
91:
C
92:
B
93:
C
94:
D
Solution: 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 .
95:
B
96:
B
97:
A
98:
D
99:
B
100:
B
101:
B
Solution: $$
x08egin{aligned}
extbf{Given:}
& L=4, ext{m},
h=0.8, ext{m},
d_{ ext{rear}}=1.2, ext{m},
mu=0.8 \[4pt]
ext{Front axle distance:}
& L-d_{ ext{rear}}=2.8, ext{m} \[6pt]
extbf{Concept:}
& ext{Front-wheel braking
force limited by front-axle load} \[6pt]
ext{Static front-axle load:}
& W_f=Wfrac{d_{ ext{rear}}}{L}=0.3W \[4pt]
ext{Max braking force:}
& F_{max}=mu W_f=0.3mu W \[4pt]
ext{Retardation:}
& a=frac{F_{max}}{m}=0.3mu g \[4pt]
& a=0.8 imes0.3 imes9.81approx2.35, ext{m/s}^2approx2.4, ext{m/s}^2 \[6pt]
& x08oxed{ ext{Answer: } 2.4, ext{m/s}^2
( ext{Option B})}
end{aligned}
$$
102:
B