What Happens if Gasoline is Used in a Diesel Engine

1) What happens if gasoline is used in a Diesel engine?Diesel engine will work ?

No, It will not work, as the Compression ratio of Petrol engine is 6 to 10 & that of Diesel engine
is 15 to 22. Thus on such high compression, gasoline gets highly compressed & it may blast.

2) Which Mechanism is used in Automobile gearing system

a. Differential mechanism

3) Why different types of sound are produced in different bikes though they say run on SI
engine

a. Engine specifications are different in different manufactures like as Bore Diameter(CC),
Ignition timing. Also the exhaust passage take more responsible for sound.

4) Why entropy decreases with the increase in temperature?

a. ds=dQ/T Entropy is inversely proportional to the temperature so. as temp. increases,
entropy decreases.

5) 1 hp how much watt?

o. 746.2Watt

6) How to calculate bearing number to diameter of the inner and outer

a. Divide the shaft diameter size by 5, it will give last two digit of the bearing no. and
according to type of load we have to choose the type of bearing and that will give prior
no. of the bearing.

7) Explain Bicycle rear wheel Sprocket working?
a. Rear wheel sprocket works under the principle of ratchet and pawl.

8) Definition of Octane number & Cetane number

a. Octane No.- Octane number is defined as the percentage, by volume, of iso octane in
the mixture of iso octane and h-heptane. It is the measure of rating of SI engine.
b. Cetane No.- Cetane number is defined as the percentage, by volume, of n-cetane in
the mixture of n-cetane and alpha methyl naphthalene. It is the measure of rating of
CI engine.

9) Poisons ratio is higher in (rubber/ steel/wood)

a. When a material is compressed in one direction, it usually tends to expand in the other
two directions perpendicular to the direction of compression. This phenomenon is
called the Poisson effect. Poisson’s ratio is a measure of the Poisson effect.

i. For rubber = 0.5

ii. For steel = 0.288
iii. For wood < 0.2

iv. Thus Poisson’s ratio is higher in RUBBER.

10) The Fatigue life of a part can be improved by ?
a. Improving the surface finish by Polishing & providing residual stress by Shot
peening.

11) When crude oil heated Which Hydro carbon comes first?

a. Natural gas(Gasoline)… at 20 Celsius


12) Different between technology & engineering?

a. Engineering is application of science. Technology shows various methods of Engineering.
A bridge can be made by using beams to bear the load, by an arc or by hanging in a cable; all
shows different technology but comes under civil engineering and science applied is laws of
force/load distribution.

13) How a diesel engine works in generator?

a. Diesel engine is a prime mover, for a generator, pump, and for vehicles etc. generator
is connected to engine by shaft. mostly in thermal power plat ,there is an engine is
used to drive generator to generate power.


14) WHAT IS THE OTHER NAME OF MICROMETER & VERNIER CALLIPER

a. Micrometer’s other name is Screw Gauze &

Vernier caliper’s other name is slide caliper.

15) What is flashpoint?

a. Flash point: the lowest temperature at which the vapor of a combustible liquid can be
ignited in air.


16) what is basic difference between impulse turbine and reaction turbine

In impulse turbine, jet is used to create impulse on blades which rotates the
turbine and in reaction turbine, no jet is used pressure energy is converted
into kinetic energy.
In impulse turbine fluid enter& leave with same energy ,but in reaction
turbine fluid enter with pressure energy& leaves with kinetic energy In
impulse turbine all the pressure drops in nozzle only & in reaction turbine
pressure drops both fixed & moving blades. The difference is due to blade
profiles.

17) What is the need for drafting?

a. Drafting is the allowance gives to casting process. It also used to remove the casting
from mould without damage of corners.

18) what is the difference between BSP thread and BSW thread?

a. The British Standard Pipe thread (BSP thread) is a family of standard screw thread types
that has been adopted internationally for interconnecting and sealing pipe ends by
mating an external (male) with an internal (female) thread. British Standard Whitworth
(BSW) is one of a number of imperial unit based screw thread standards which use the
same bolt heads and nut hexagonal sizes.

19) What is refrigerant?

a. Any substance that transfers heat from one place to another, creating a cooling
effect. Water is the refrigerant in absorption machines.

20) The amount of carbon present in Cast Iron

a. Carbon is basically present in the form of cementite in cast iron. Its percentage lies in
the range of 2.03-6.67(% by weight of cementite for Cast Iron.If the amount is less than
the above range than it is stainless steel.

21) What are the loads considered when designing the Nut and Bolts?
a. Shear Loads & crushing loads

22) what is the effect of reheat on rankine cycle?
1. Efficiency increases
2. work output increases
3. Both
4. None of these.

a. 1. Efficiency increases. This prevents the vapor from condensing during its expansion
which can seriously damage the turbine blades, and improves the efficiency of the cycle,
as more of the heat flow into the cycle occurs at higher temperature.
23) Why Involutes Curve used in Gear?

a. Involutes curve is the path traced by a point on a line as the line rolls without slipping
on the circumference of a circle. Involutes curve has a contact angle between two gears
when the tangents of two gears pass through the contact point without friction.
24) What is Bearing stress?

a. The stress which acts on the contact surface area between two members is known as
bearing stress. An example for this is the stress between nut and the washer.
25) Which is hard material Cast Iron or Mild Steel?

a. Cast iron. Due to the excess carbon content than mild steel it is harder. The
more carbon content, the more hardness will be. But it reduces the weld
ability due to this hardness. It is brittle too.