1. Define limit, and fit?

fit is defined as the the degree of tightness and looseness between two meeting partw

2. What is the working principle of hydrostatic propeltion system in a tractor?

it depends on pascal law. As the pressure in the system is the same, the force that the fluid gives to the surroundings is therefore equal to pressure x area. In such a way, a small piston feels a small force and a large piston feels a large force

3. WHY THE COLOR OF VEHICLE TYRES ARE ALWAYS BLACK IN COLOUR.
IS THERE ANY THING RELATED WITH HEAT CONDUCTION?

During the process of vulcanisation of rubber to make it
sheer resistant to make tyres out of it, a certain
proportion of carbon is mixed into it. Without this
procedure the tyres will not be able to withstand the
friction n stress of the road. This carbon is responsible
for giving tyres the characteristic black colour.. When
ozone combines with ultraviolet light from the sun, it
attacks the tire polymer. To prevent tires from rapidly
deteriorating, a sacrificial absorber is used, "carbon
black" - which, fittingly, makes tires black

4. What is staring oil grade SAE nos of gear box,in passenger car?

"SAE" STAND "SOCIETY OF AUTOMOTIVE ENGINEERS" (USA).

SAE20W40 :4WHEELER ENGINE,2 WHEELER ENGINE, GEAR BOX &CLUTCH.
SAE40W60 :GEAR BOX OF RWD & 4WD VEHICLE.

5. WHAT IS TRANSVERSE WEIGHT SHIFT DUE TO DRIVE TORQUE?

it is weight of drive torque which is bolted to chassis of the car.

7. What is the range of the engine efficiency for two stroke engine? Why you don't see two stroke engine in car? What are problem with two stroke engine?

the range of two sroke engine is too high compare to the
four stroke engine be cause of each revalution one power in
two sroke engine . i canot see the 2 sroke engine in
car.power loss is more.

8. What is a injecter pressure in heavy viehle?

injecter pressure is 220 kg/cm square

9. WHAT IS THE MEANING OF CC OF ENGINE?

CC stands for Cubic centimeter. CC represents the total
volume of an engine cylinder. The engine which has more
CC , can produce more power than others.

10. WHAT IS THE DIFFRENCE BITWEEN BS2 & BS3 ENGINE?

IN BS2 there is No catalytic converter to reduce formation
of co and HC whereas in BS3 catalytic converter is
available to reduce the formation of HC and CO. So less
emission of HC and co will take place in BS3