In petrol engines, during suction stroke, ________ is drawn in the cylinder
Air and fuel
Only fuel
Only air
None of these
Correct Answer :
A. Air and fuel
Related Questions
The compression ratio of a petrol engine is nearly
4 : 1
8 : 1
15 : 1
20 : 1
The cetane rating of Diesel fuel is in the order of
25
45
70
90
The natural gas is compressed in a CNG cylinder at a pressure of
200 bar
220 bar
250 bar
300 bar
The Diesel engine works on
Otto cycle
Carnot cycle
Diesel cycle
Rankine cycle
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
In an engine, the temperature of the piston will be more at the
Crown of the piston
Skirt of the piston
Piston walls
Piston rings
The firing order for an opposed four cylinder l.C. engine is
1-2-3-4
1-3-4-2
1-4-3-2
1-3-2-4
The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of
Section width to section height
Section height to section width
Wheel diameter to section height
Wheel diameter to section width
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
The connecting rod connects the piston and the
Cylinder head
Cylinder block
Camshaft
Crankshaft
In which of the following conditions, the idle CO percentage should be measured with the vehicle?
Headlights and other electrical devices are switched off
Headlights and other electrical devices are switched on
Headlights and other lights are switched off
Headlights are switched on
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
Odometer is an instrument used for measurement of
Power
Fuel consumption
Engine r.p.m.
Distance
An engine has a clearance volume of 100 cm³ and a swept volume of 800 cm³. The compression ratio is
7 : 1
8 : 1
9 : 1
10 : 1
The auto ignition in a spark ignition engine means
Automatic ignition of the charge at the end of compression
Ignition induced by the passage of a spark
Ignition of the charge before the passage of flame front
Ignition induced to supplement the process of normal combustion
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
Which of the following parameter can be adjusted by modifying the tie rod attachment length?
Camber
Caster
Toe
Steering gear ratio
In a four stroke engine for each crankshaft revolution, the camshaft revolves
One half turn
One turn
Two turns
Four turns
The engine oil level should be checked
Immediately after the ignition switch is turned off
While the engine is running
A few minutes after the ignition switch is turned off
While the engine is running at high idle speed
In comparison with a radial tyre, one advantage of a bias ply tyre is
Longer life
Lower rolling resistance
Smoother ride at low speeds
None of these
The starting system includes
A battery, a starter, and an ignition switch
A battery, a distributor, and an ignition switch
A battery, a starter, and a distributor
A distributor, a starter, and an ignition switch
Thinner is added to the paint in order to
Make pigments and resin mix easily
Make paint film hard
Optimise its viscosity
None of these
The purpose of transmission in an automobile is
To vary the speed of automobile
To vary the torque at the wheels
To vary the power of automobile
None of these
A laminated glass upon cracking
Bursts into sharp edged fragments
Bursts into granular pieces
Sandwiched layer traps the fragments
Breaks into the form of crystals
The combustion process in a Diesel engine is a
Constant volume process
Constant pressure process
Constant temperature process
Adiabatic process
The ball joints are used on the tie rod ends, because they
Reduce the amount of noise generated
Reduce the amount of sliding resistance
Can deal with movement of the suspension both vertically and in other directions
Improve the force transmission speed
The octane number of compressed natural gas (CNG) is
90
100
110
120
The painting of automobiles is done to
Prevent rust from growing on the body
Improve its external appearance
Retain the characteristics of steel for long
All of these
The clutch is located between the transmission and the
Engine
Rear axle
Propeller shaft
Differential
The problems caused by the wheel imbalance are
Hard steering and hard ride
Poor acceleration and hard steering
Steering wheel vibrations and uneven tyre wear
Poor acceleration and reduced fuel efficiency