The antiknock property of compression ignition engine fuel can be improved by adding
Tetraethyl lead
Trimethyl pentane
Amyl nitrate
Hexadecane
Correct Answer :
C. Amyl nitrate
Related Questions
The function of antilock brake system (ABS) is that is
Reduces the stopping distance
Minimises the brake fade
Maintains directional control during braking by preventing the wheels from locking
Prevents nose dives during braking and thereby postpones locking of the wheels
A four cylinder engine has a capacity of 2.4 litres. The swept volume of one cylinder is
400 cm³
600 cm³
1200 cm³
2400 cm³
The acid used in automobile battery is
Hydrochloric acid
Hydrofluoric acid
Nitric acid
Sulphuric acid
The main characteristics of a maintenance free (MF) battery is that
A maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid
A maintenance free battery has a relatively short shelf life when compared with standard batteries
Since it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water
Recharging of a maintenance free battery is neither required nor possible
Cushioning springs in clutch plate reduces
Vehicle speed
Torsional vibrations
Jerky starts
None of these
The purpose of adding pigment to the paint is that it
Optimises the viscosity of paint
Makes paint film hard
Gives colour and filling up effect to the paint
None of the above
What type of bearing is used for main bearings and connecting rod bearings?
Ball bearings
Plain bearings
Needle roller bearing
Taper roller bearing
The stroke of an engine is the
Volume of the cylinder
Length of the connecting rod
Internal diameter of the cylinder
Distance between T.D.C. and B.D.C.
A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it
Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion
Allows the steering wheel to be turned by a greater amount when steering
Makes the steering more responsive
Reduces the amount of kickback for large steering angles
The basic purpose of providing caster angle on wheels is to
Prevent uneven tyre wear
Maintain directional control
Bring the road contact of the tyre under the point of load
Compensate for wear in the steering linkage
Which of the following oil is more viscous?
SAE 30
SAE 40
SAE 70
SAE 80
The number of exhaust manifolds in a V6 engine is
One
Two
Four
Eight
The air gap between the central electrode and ground (or side) electrode of a spark plug is around
0.2 mm
0.5 mm
1 mm
1.5 mm
A traction control system (TCS) in automobiles controls the
Vibrations on the steering wheel
Engine power during acceleration
Torque that is transmitted by the tyres to the road surface
Stopping distance in case of emergency
The condition that results in large quantities of HC emission is
High temperature combustion
Incomplete combustion
Low temperature combustion
High atmospheric temperature combustion
The basic purpose of tyres is to
Grip the road and provide good traction
Substitute for springs
Act as brake
None of these
The camshaft of a four stroke Diesel engine running at 1000 rpm will run at
500 rpm
1000 rpm
2000 rpm
4000 rpm
The function of a second ring is that it is a
Back up compression ring which will work in place of the top ring when it is broken
Compression ring and aids the top ring in sealing and cooling
Back up oil control ring which will work in place of the bottom ring when it is broken
Cushion ring which prevents piston slap and knock
The most commonly used supplementary restraint system (SRS) component is
Seat belt
Brake
Airbag
Steering
The firing order for an inline four cylinder I.C. engine is
1-2-3-4
1-3-4-2
1-2-4-3
1-3-2-4
A clutch is usually designed to transmit maximum torque which is
Equal to the maximum engine torque
80 % of the maximum engine torque
150 % of the maximum engine torque
None of these
The component that is responsible for converting the rotation of the steering wheel into lateral motion is the
Steering wheel
Steering shaft
Steering gearbox
Tie rod
The function of a radiator fan in the cooling system is that
It blows air through the radiator when necessary
It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump
It cools the engine by blowing air onto the cylinder block
It draws heat out of the engine compartment
The lower cylindrical portion of the piston which improves piston cooling performance is called
Piston crown
Connecting rod
Piston pin boss
Piston skirt
The correct flow of power through the drive train is
Engine drive shafts, clutch, main shaft, counter shaft, final driven gear, wheels
Engine clutch, main shaft, counter shaft, final driven gear, drive shafts, wheels
Engine clutch, counter shaft, main shaft, final driven gear, drive shafts, wheels
Engine main shaft, counter shaft, clutch, final driven gear, drive shafts, wheels
The effect of vapour locking on the brake performance is that the
Brakes function more effectively
Brakes fail completely
Brake operation is delayed after depression of the brake pedal
Vapour locking has no effect on brake performance
The order in which effort applied to the steering wheel is transferred to the front wheel is
Steering wheel, steering gearbox, steering shaft, tie rod, steering knuckle, front wheels
Steering wheel, steering shaft, steering gearbox, tie rod, steering knuckle, front wheels
Steering wheel, steering shaft, steering gearbox, steering knuckle, tie rod, front wheels
Steering wheel, tie rod, steering gearbox, steering shaft, steering knuckle, front wheels
The gradient resistance to a vehicle having a mass of 980 kg moving on an incline of 10° is
1.6694 N
16.694 N
166.94 N
1669.4 N
A basic difference between the spark ignition engine and the Diesel engine is that the
Diesel engine compresses air alone instead of an air-fuel mixture
Air temperature ignites the fuel in the Diesel engine
Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke
All of the above
For the same maximum pressure and temperature
Diesel cycle is more efficient than Otto cycle
Otto cycle is more efficient than Diesel cycle
Both Otto cycle and Diesel cycle are equally efficient
None of the above