Automobile Engineering Interview Question and Answers Part 3
Automobile Engineering Basic Interview Question , quiz ,viva , oral Examination
72. What is the function of clutch?
The function of the clutch is to connect and disconnect the engine with road wheels. The clutch has to be disengaged during gear shifting, idling etc.
73. What are the types of clutch?
• Single plate clutch
• Multi plate clutch
• Cone clutch
• Semi centrifugal clutch
• Centrifugal clutch
• Fluid flywheel
74. State the requirements of an automotive clutch
a) Torque transmission should be maximum
b) Gradual engagement of clutch plates
c) Heat dissipation should be more
d) Dynamic balancing of clutch components
e) Vibration damping
f) Size should be small
g) Inertia should be low
h) Clutch free pedal play should be sufficient
i) Ease of operation
75. What is the function of gear box? State its types.
The functions of the gearbox are
i). To provide the leverage ratio
ii). To provide the neutral position
iii). To provide a means to reverse the vehicle.
• Sliding mesh gearbox
• Constant mesh gearbox
• Synchromesh gearbox
• Automatic gearbox – Torque converter
76. Why is gear box necessary in automobile?
• The variation of resistance to vehicle motion at different speeds
• The variation of tractive effort of the vehicle required at various speeds For above said reasons, a gearbox is necessary in an automobile
77. What is tractive effort?
It is the force available at the road wheelsfor propelling the vehicle.
T = µW
Where, T = Tractive effort
µ– Coefficient of friction between tyre and road surface
W – Load of the vehicle
78. Why is sliding mesh gear box not preferred?
• More noise
• More wear and tear on the gears
• For smooth, quiet and quick change of gears, the driver requires great skill
For the above-said drawbacks, the sliding mesh gearbox is generally not preferred.
79. What is automatic transmission?
In the automatic transmission, for changing the gear ratios, manual effort is not at all needed. The change of gear is performed automatically according to the vehicle speed.
80. What is an over drive?
When the speed of the output shaft is greater than the speed of the input shaft, then the drive is known as overdrive.
Example: 0.8:1 or 0.9: 1
81. What is a universal joint? What are its types?
Universal joint is a type of flexible joint between two shafts who axes intersect and may assume different inclinations at different times. It is used to transmit power even at inclined angles of the shaft.
• Yoke joint
• Single cardan joint
• Double cardan joint
• Rag joint
• Canfield joint
82. State the functions of a slip joint.
The function of a slip joint is to accommodate the propeller shaft length variations, when a vehicle is moving over a bump or bit.
83. What is the necessity of a propeller shaft?
The propeller shaft is used to transmit the power from the gearbox to the final drive. It is also used to cover the span between these two components.
84. What is Hotchkiss drive and Torque Tube drive?
In Hotchkiss drive, the loads such as vehicle weight, driving torque, braking torque and side thrust all are taken by leaf springs. Two universal joints and one slip joint are must needed.
In Torque tube drive, the driving torque and braking torque are taken by torque tube while the vehicle weight and side thrust are taken care of by leaf springs. One universal joint is just sufficient.
85. What is the function of differential unit?
The function of a differential unit is to permit the vehicle turns without wheel skidding. It permits higher speed for outer wheels and reduced speed for inner wheels during turning.
86. What is the function of pressure plate in a clutch?
The function of a pressure plate is to hold the friction (clutch) plate tightly against the engine flywheel.
87. What is meant by differential lock?
A Differential lock will transmit the same amount of power to both wheels on the axle – which is very useful in 4WD applications where a truck might be stuck and have problems getting out of deep mud or snow.
88. What is a fluid coupling?
Fluid coupling is device which transmits torque due to the kinetic energy of the moving fluid. In a fluid coupling, two members namely impeller and turbine are present.
89. What is the use of torque convertor?
The torque converter is device which provides a varying torque ratio using fluid energy. In a torque converter, three members namely impeller, turbine and stator are present.
90. State the forces act on the rear axle
• Shear force due to vehicle weight
• Bending moment due to vehicle weight
• Driving torque
• Shear force due to side thrust
• Bending moment due to side thrust
91. What are the different types of rear axles?
• Semi floating rear axle
• Full floating rear axle
• Three quarter floating rear axle
92. What is the purpose of Stator in the Torque Converter?
The stator changes fluid flow between the turbine and pump and thus permits the torque
multiplication. Without a stator, a torque converter will simply act as a fluid coupling.
93. Why Synchronizer is required in the automotive transmission system?
Synchronizer is used to equalize the speed of two mating surfaces, before the contact is established. By doing so, wear & tear and noise can be avoided.
94. What is transfer box? Where it is used?
The transfer box is used to convert 2 wheel drive into 4 wheel drive. This is mainly used in hilly regions.
95. Define wheel track and wheel base.
The distance between the tyre centers, mounted on the same axle is known as wheel track.
The wheelbase is the distance between the centers of the front and rear wheels
96. Give a brief note on damper.
It is used to dampen the vibrations of the suspension springs. It is mostly used in independent suspension.
97. Distinguish between disc brake with drum brake
98. What is meant by bleeding of brakes?
The process of removing air from the hydraulic brakes is known as bleeding of brakes.
99. Define steering gear.
The steering gear is used to convert the rotational movement of the steering wheel into linear movement of the steering linkage. Moreover it provides mechanical advantage.
100. What are the different types of wheels?
- Pressed steel disc wheels
- Wire spoke wheels
- Light alloy casted wheels
101. What is the purpose of Toe-in and Toe-out?
The purpose of providing a toe in and toe out is straight line stability of the vehicle, after negotiating a turn.
102. What are the different types of tyres used in automobile?
- Cross ply tyres
- Radial ply tyres
- Belted bias tyres
103. What are the different types of springs used in suspension system?
- Leaf springs (Rigid axle suspension)
- Coil springs (Independent suspension)
- Torsion bar (Independent suspension)
104. Define king pin inclination.
The tilt of the king pin from the vertical reference line is known as King Pin Inclination (KPI). It is also called as Steering Axis Inclination (SAI).
105. Give the function of tyre?
- Supporting Vehicle Weight
- Transferring Traction & Braking forces to the Road Surface
- Changing & Maintenance Direction of Travel
- Absorbing Road shocks
106. Define castor and camber.
Castor: The tilt of the king pin from the vertical reference line when viewed from side is known as castor.
Camber:The camber angle is the inward or outward tilt of the wheel relative to the vertical reference
107. What are the benefits of anti-lock brake system?
- Preventing the wheel from locking at the time of braking
- Keeping the wheel rotating
- Due to rotating wheel, it helps you to steer away the vehicle from the object, while applying brakes at the same time.
- It is even more effective in sand, snow, water, and mud where loss of traction is even higher, as on these surfaces, with normal braking system, it is even easier to lock wheels and loose traction but ABS works excellent in these conditions also and stops the vehicle in a much shorter distance.
108. What is steering ratio?
The steering ratio is defined as the ratio of angle turned on the steering wheel to the angle turned by the stub axle.
109. What is toe in and toe out?
The distance between the front ends of wheels is less than the rear end, the condition is said to be toe-in. The distance between the front ends of wheels is more than the rear end, the condition is said to be toe out.
110. What are the types of steering gear box?
a) Worm & Worm wheel steering gear
b) Worm and Nut steering gear
c) Worm and Roller steering gear
d) Recirculating Ball steering gear
e) Rack and Pinion steering gear
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