1.What is the function of connecting rod?
Ans:- It is used to convert reciprocating motion of the piston into rotary motion of the crankshaft.
2. What is scavenging process?
Ans:- It is the process of forcing out the burnt gases out of the cylinder by admitting fresh charge into the cylinder
.3. What is the function of cooling system?
Ans:-
- To cool the engine parts and save it from overheating.
- To maintain normal temperature under all working speeds and loads.
4. What are the types of pumps used in Lubrication system?
Ans:-
- Gear pump
- Rotor pump
5. What are the properties of petrol?
Ans:-
- Purity
- Volatility
- Sulphur content
- Gum content
- Antiknock quality
- Calorific value
- Operating economy
6. What is meant by octane number and cetane number?
Ans:-
- Octane number : The octane number of any fuel is the percentage of iso-octane by volume in mixture of iso –octane and normal heptane.
- Cetane number : The cetane number is defined as the percentage by volume of normal cetane and alpha-methyl-napthalene.
7. Write the types of injection nozzles.
Ans:-
- Single hole nozzle
- Multihole nozzle
- Pintle nozzle
- Pintaux nozzle
8. What is governing?
Ans:-
The process of controlling the speed of the engine by adjusting the fuel supply is called governing.
9. What is the function of a clutch?
Ans:-
- It is used for connecting or disconnecting the drive of the engine to the gear box.
- To disconnect the engine from the gear box as required under following situations.
- To start the engine and warm it up
- To facilitate to engage 1st or 2 nd gear to move the vehicle from the rest
- Disconnect power to gear box for easy shifting of gears, so that the noise and damage to the gear is avoided.
- Disconnecting drive from the engine to stop the vehicle after application of brakes.
- To transmit the engine power to the rear wheels without shock.
- The clutch is engaged only when the vehicle is in motion.
10.Write the causes for clutch slipping.
Ans:-
- Worn lining
- Lining glazed
- Grease or oil on lining
- Weak pressure spring
- Lack of free play in clutch pedal
- Worn splines on clutch
11. Write the types of gear used in final drive
Ans:-
- Straight bevel gear
- Spiral bevel gear
- Hypoid bevel gear
- Worm and worm wheel
12. What is non-slip differential?
Ans:-
A non-slip differential is a type of differential is a type of differential that allows its two output shafts to rotate at different speeds but limits the maximum difference between the two shafts.
13. What is live axle and dead axle?
Ans:-
- Live axle : It has the differential mechanism through which the engine power is transmitted to the wheels.
- Dead Axle : it is a dummy axle without any connections with the engine. or Also known as Axel without supply of engine power.
14. What is toe-out on turns?
Ans:-
The wheel may set closer at the rear than at the front in which case the difference of the distances between the wheels at the front and the rear is called toe-out.
15. What are the types of front independent suspension?
Ans:-
- Wishbone type or parallel link type
- Mac Pherson strut type
- Vertical guide type
- Trailing link type
- Swinging half axle type
16. What is shock absorber?
Ans:-
The shock absorber is a device which introduces resilience to the up and down movement of the suspension spring so as to damp out the vibrations quickly.
17. Name different battery ratings.
Ans:-
- Twenty hour rate
- Twenty minute rate
- 25 ampere rate
- Cold rate
18. What are the two types of ignition system?
Ans:-
- Compression ignition system ( Diesel )
- Spark ignition system ( Petrol)
19. What are the various types of lighting system used in automobiles?
Ans:-
- Head light
- Parking light
- Directional signal light
- Blinker lights
- Stop lights
- Tail lights
- Interior lights
20. What is catalytic converter?
Ans:- It is a which is used to control the emission levels of various pollutants by changing the chemical characteristics of the exhaust gases.
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