The best fuels for compression ignition engines are
Straight chain paraffin
Aromatics
Branched chain paraffin
Naphthalene
Correct Answer :
D. Naphthalene
Related Questions
In a single dry plate clutch, torsional vibrations are absorbed by
Coil springs known as torsional springs
Cushion springs
Central hub
Clutch pedal
Valve overlap is the number of degrees of camshaft rotation during which
Both valves are closed
Both valves are open
Both 'A' and 'B'
None of these
Free pedal play in car clutches is about
15 mm
25 mm
40mm
60 mm
Which of the following oil is more viscous?
SAE 30
SAE 40
SAE 70
SAE 80
In a Diesel engine, the fuel is ignited by
An electric spark
The heat of compression
The hot exhaust
None of these
The specific gravity of Diesel is about
0.65
0.75
0.85
0.95
The natural gas is compressed in a CNG cylinder at a pressure of
200 bar
220 bar
250 bar
300 bar
The correct way to rectify an imbalanced wheel is to
Adjust the tyre pressure
Rotate the tyres
Adjust the damper spring tension
Attach appropriate weights to the wheel at appropriate positions
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
Damper is also known as
Shock absorber
Torsion bar
Spring
Radius rod
The calorific value of petrol is about
36.5-38.5 MJ/kg
39.4-42.5 MJ/kg
42.7-43.5 MJ/kg
45.5-47 MJ/kg
The basic purpose of tyres is to
Grip the road and provide good traction
Substitute for springs
Act as brake
None of these
In a square type engine
Geometrical shape is square
Diameter and length of piston are same
Two cylinders are placed horizontal and two vertical
Stroke length and cylinder bore are same
The vehicle ride will be comfortable if
Unsprung mass is kept minimum
Sprang mass is kept minimum
Vehicle mass is kept minimum
All of these
An imbalance wheel during vehicle operation
Makes large noise when its heavy point hits the road surface
Deflects in the vehicle's longitudinal direction
Bounces vertically or deflects from side to side (as seen from front or rear)
Creates a standing wave
The positive plates of a lead acid battery has
Lead peroxide (PbO₂)
Spongy lead (Pb)
Lead sulphate (PbSO₄)
Sulphuric acid (H₂SO₄)
The valve tappet clearance is measured by
Screw pitch gauge
Engineering scale
Feeler gauge
Vernier caliper
The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the engine cylinder from the crankcase, is known as
Cleaning
Priming
Scavenging
Detonation
The main purpose of an engine's air cleaner is that it
Controls the engine's air intake volume
Reduces the engine's air intake noise
Prevents rain water from entering the engine
Prevents dust and other foreign matter from entering the engine
Vulcanizing means
Heating rubber under pressure
Spraying with special paint
Melting rubber while stirring it
None of these
The function of oil control rings is that it
Lubricates the cylinder wall by releasing oil from its hole
Keeps the cylinder wall lubricated by holding oil in its channel
Prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan
Maintains a seal and prevents escape of burned gases and oil leakage
The main function of the brake fluid is
Lubrication
Power transmission
Cooling
None of these
The caster is called positive when the top of the king pin is inclined to the
Rear of the vehicle
Front of the vehicle
Left of the vehicle
Right of the vehicle
The engine oil is stored in __________ when the engine is not running.
Oil pan
Cylinder head
Oil pump
Separate oil tank
The basic part of the engine, to which the other engine parts are attached or assembled is the
Cylinder head
Crankshaft
Cylinder block
Oil pan
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
A petrol engine of a car develops 125 Nm torque at 2700 r.p.m. The car is driven in second gear having gear ratio of 1.75. The final drive ratio is 4.11. If the overall transmission efficiency is 90%, then the torque available at the driving wheels is
8.091 Nm
80.91 Nm
809.1 Nm
8091 Nm
The boiling point of Diesel fuel is in the range of
70°C to 100°C
100°C to 120°C
120°C to 180°C
180°C to 360 °C
A front stabilizer bar is used to
Increase vehicle load carrying capacity
Provide a softer ride
Control suspension movement and body roll
All of the above
Which of the following is not a part of the chassis?
Wheels
Front axle
Steering system
Seats