The condition that results in large quantities of CO emission is
Insufficient air during combustion
Insufficient fuel during combustion
Low temperature combustion
High temperature combustion
Correct Answer :
A. Insufficient air during combustion
Related Questions
The main cause for the change in engine oil viscosity is
Humidity
Temperature
Vibration
Contamination
Engine misfiring is likely to result from
Spark plug gap too small
Spark plug gap too wide
Vapours lock in the fuel only
Incorrect fuel air mixture
The battery is an electrochemical device, which means battery
Makes chemicals by mechanical means
Uses chemical action to provide electricity
Has curved plates instead of flat plates
Does not use an electrolyte
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 heat transfer from coolant to air in the radiator of an automobile engine takes place by
Radiation only
Convention only
Convection and radiation
Conduction, convection and radiation
The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as
Indicator diagram
Axial force diagram
Valve timing diagram
None of these
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
When turning a corner
The front wheels are toeing out
The front wheels are turning on different angles
The inside front wheels has a greater angle than the outside wheel
All of the above
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
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 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 coefficient of rolling resistance for a truck weighing 63,500 N is 0.018. The rolling resistance to the truck is
1.143 N
11.43 N
114.3 N
1143 N
During suction stroke, the inside pressure of cylinder is
More than the atmospheric pressure
Less than the atmospheric pressure
Equal to the atmospheric pressure
None of these
The capacity of a battery is usually expressed in terms of
Volts
Amperes
Weight
Ampere hours
The two rows of cylinders in a 'V' type engine are generally arranged at
45°
60°
90°
130°
The cetane number of a Diesel fuel is a measure of
Volatility
Viscosity
Ignition quality
Delay period
The component of the oil filter that prevents the passage of metal particles and sludge is
Element
Relief valve
Check valve
Case
In a petrol engine, the high voltage for spark plug is in the order of
1000 volts
2000 volts
11 kilovolts
22 kilovolts
The antiknock property of compression ignition engine fuel can be improved by adding
Tetraethyl lead
Trimethyl pentane
Amyl nitrate
Hexadecane
The commonly used antifreeze solution in automobiles is
Carbon disulphide
Ethylene glycol
Ammonium chloride
Freon-12
Which of the following oil is more viscous?
SAE 30
SAE 40
SAE 70
SAE 80
The tyre rotation is generally done at
1000 km
4000 km
6000 km
10000 km
The petrol engine works on
Otto cycle
Carnot cycle
Diesel cycle
Rankine cycle
Which of the following parameter can be adjusted by modifying the tie rod attachment length?
Camber
Caster
Toe
Steering gear ratio
The lower cylindrical portion of the piston which improves piston cooling performance is called
Piston crown
Connecting rod
Piston pin boss
Piston skirt
The device for smoothening out the power impulses from the engine is called
Clutch
Differential
Flywheel
Torque converter
The connecting rods are generally made of ________ shaped crosssection.
I
C
L
H
The effect of having excess camber is
Excessive steering alignment torque
Hard steering
Too much traction
Uneven tyre wear
The starter motor is driven by
Chain drive
Gear drive
Flat belt drive
V-belt drive
If the engine coolant leaks into the engine oil, then engine oil
Appears milky
Become foamy
Turns black
None of these