The lower cylindrical portion of the piston which improves piston cooling performance is called
Piston crown
Connecting rod
Piston pin boss
Piston skirt
Correct Answer :
D. Piston skirt
Related Questions
In order to implement gear changes in the gear unit of an automatic transmission, a ________ is used.
Synchronizer
Planetary gear
Magnetic clutch
Hydraulic multi plate clutch
The function of a connecting rod is
To turn the flywheel
To drive the drive plate
To drive the fuel pump
To transmit motion of the piston to the crankshaft
The compression ratio in petrol engine is kept less than in Diesel engine because
It makes petrol engines lighter
Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
Less compression ratio gives better performance
It is just customary to have less compression ratio in petrol engines
Which one of the following statement correctly describes the construction of a bevel gear type differential?
The drive shafts are splined to the differential carrier.
The left side gear and the differential carrier rotate in constant unison.
The differential carrier houses differential pinion gears and side gears; each pinion gear meshes with a different side gear.
The differential carrier houses differential pinion gears and side gears
If the engine coolant leaks into the engine oil, then engine oil
Appears milky
Become foamy
Turns black
None of these
Clutch facings are usually attached to the plate by
Steel rivets
Brass rivets
Aluminium screws
Steel screws
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
In a petrol engine, the high voltage for spark plug is in the order of
1000 volts
2000 volts
11 kilovolts
22 kilovolts
The main feature of Macpherson strut suspension is that
The vertical size of the suspension can be made more compact
Non vertical external forces are supported by the suspension arms
The unsprung mass in lighter
The assembly is slightly more complicated in design
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 petrol engines, during suction stroke, ________ is drawn in the cylinder
Air and fuel
Only fuel
Only air
None of these
Which of the following symptom is caused as a result of brake disc run out?
Ineffectiveness of the brakes
Judder during braking
Localized wearing of the brake pads
Rapid wearing of the brake pads
The connecting rod is attached to the piston by the
Cap bolt
Piston pin
Cap roller bearing
Rod cap
The function of an alternator in an automobile is to
Supply electric power
Converts mechanical energy into electrical energy
Continually recharges the battery
Partly converts engine power into electric power
In a ventilated disc brake
A duct directs air towards the caliper for cooling while the vehicle is moving
Caliper is covered with cooling fins
Disc contains many small holes for optimum cooling performance
Disc contains radial vanes between its rubbing surfaces for optimum cooling performance
The compression ratio of a petrol engine is nearly
4 : 1
8 : 1
15 : 1
20 : 1
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
An oil filter bypass valve opens when the
Engine is cold
Engine overheats
Oil filter becomes clogged
Engine runs at high speed
The fuel pump in the programmed fuel injection (PFI) system is located
Between the fuel filler pipe and fuel tank
In the fuel tank
On the distributor mounting in the engine compartment
On the engine compartment bulkhead
In Diesel engines, during suction stroke, ________ is drawn in the cylinder.
Air and fuel
Only fuel
Only air
None of these
Which of the following indicates multigrade oil?
SAE 30
API SF
SAE 20 W50
API 50
The function of positive crankcase ventilation (PCV) system is that it
Mixes fuel with air
Promotes combustion by creating a swirling movement in the air-fuel mixture
Returns blow by gases from the crankcase to the intake system
Feeds blow by gases to the exhaust manifold
The function of a first compression ring (top ring) is that it
Increases the combustion temperature
Creates swirl
Maintains a seal and prevents the fuel leakage
Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
In a four stroke engine for each crankshaft revolution, the camshaft revolves
One half turn
One turn
Two turns
Four turns
Highest useful compression ratio (HUCR) is the highest compression ratio at which the
Engine can run
Engine gives maximum output
Engine is most efficient
Fuel can be used in a test engine without knocking
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
Which part of the automobile tyre is subjected to greatest flexing action?
Bead
Side wall
Shoulder
Tread
The tyre rotation is generally done at
1000 km
4000 km
6000 km
10000 km
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