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
Correct Answer :
C. Convection and radiation
Related Questions
The temperature indicating instrument in vehicles indicates the temperature of
Engine piston
Engine cylinder
Lubricating oil
Jacket cooling water
The ignition coil is used to
Step up current
Step down current
Step up voltage
Step down voltage
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 compression ratio for Diesel engines usually lies in the range of
6-10
10-1
15-25
25-40
If a tyre is designated as 175/65 R-14 82-S, then the aspect ratio for the tyre is
175
65
14
82
The basic purpose of tyre rotation on automobiles is to
Avoid ply separation
Equalize wear
Get better ride
None of these
Two general types of tyres are
Tube type and tubeless
Solid and tubeless
Air and pneumatic
Split rim and drop centre
In aluminium cylinder blocks, the cylinder liners are made of
Aluminium
Ceramic
Brass
Cast iron
In a forced feed lubrication system, the device used to guard against excessive oil pressure, is known as
Release chamber
Balancer
Relief valve
Stop valve
The component in the radiator of an automobile that increases the boiling point of water is
Drain plug
Water jacket
Vacuum valve
Pressure cap
The oil pump is driven by the
Camshaft
Alternator shaft
Crankshaft via drive belt
Crankshaft directly
The specific gravity of petrol is about
0.75
0.85
0.95
1.25
The torque converter uses ________ to transfer torque.
Air
Automatic transmission fluid (ATF)
Gears
Steel belt
In a four stroke engine for each crankshaft revolution, the camshaft revolves
One half turn
One turn
Two turns
Four turns
With the increase of battery temperature, the specific gravity of electrolyte
Increases
Decreases
Remains the same
None of these
The petrol engines are also known as
Spark ignition (S.I.) engines
Compression ignition (C.I.) engines
Steam engines
None of these
The minimum parking brake force is generally ________ of gross vehicle mass (GVM).
5 %
10 %
15 %
20 %
The advantage of having a tandem master cylinder arrangement in automobiles is that it
Enhances safety by serving two independent lines in a divided line brake circuit
Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss
Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side
Boosts the brake fluid pressure to reduce the force required to depress the brake pedal
The two kinds of piston rings are
Compression and oil control rings
Compression and sliding seal rings
Oil scrapper and oil control rings
Pressure and sealing rings
An oil filter bypass valve opens when the
Engine is cold
Engine overheats
Oil filter becomes clogged
Engine runs at high speed
The calorific value of Diesel is about
36.5 MJ/kg
38.5 MJ/kg
42.5 MJ/kg
45.5 MJ/kg
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
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 operation of removing trapped air from the hydraulic braking system is known as
Trapping
Tapping
Bleeding
Cleaning
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
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
The camshaft of a four stroke Diesel engine running at 1000 rpm will run at
500 rpm
1000 rpm
2000 rpm
4000 rpm
In a single dry plate clutch, torsional vibrations are absorbed by
Coil springs known as torsional springs
Cushion springs
Central hub
Clutch pedal
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 purpose of a thermostat in an engine cooling system is to
Prevent the coolant from boiling
Allow the engine to warm up quickly
Indicate the coolant temperature
Pressurise the system to raise the boiling point