In a four speed four stroke Diesel engine, the intake valve
Opens at T.D.C. and closes at B.D.C.
Opens at 20° before T.D.C. and closes at 35° after B.D.C.
Opens at 10° after T.D.C. and closes at 20° before B.D.C.
None of the above
Correct Answer :
B. Opens at 20° before T.D.C. and closes at 35° after B.D.C.
Related Questions
If the engine coolant leaks into the engine oil, then engine oil
Appears milky
Become foamy
Turns black
None of these
The crescent shaped cavity on the piston head top surface is called as
Piston oil hole
Snap ring
Valve recess
Valve clearance
The fuel that detonates easily, is
N-heptane
Iso-octane
Benzene
Alcohol
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
Odometer is an instrument used for measurement of
Power
Fuel consumption
Engine r.p.m.
Distance
The major purpose of an electronically controlled automatic transmission is that this type of transmission
Eliminates gear clutches
Eliminates the gear shaft lever
Reduces the number of automatic transmission components
Reduces shift shock and achieves more efficient transmission of engine torque
The function of a proportioning control valve (PCV) in a brake system is to
Ensure that equal pressure is supplied to the front and rear brakes throughout every braking operation
Reduce the brake fluid pressure when the brakes approach their lockup point
Cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level
Cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level.
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
An underinflated tyre will wear the tread most
Near the centre
Near the edges
In the lateral direction
In the cross direction
It is necessary to maintain the valve clearances as they
Reduce the resistance to sliding that occurs between the cam and the tappet
Allow for lengthening of the valves owing to the heat of combustion
Increase the speed at which the valves move up and down
Make the crankshaft turn smoothly
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
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
Two general types of tyres are
Tube type and tubeless
Solid and tubeless
Air and pneumatic
Split rim and drop centre
The indicated power of a four stroke engine (in watts) is equal to (where P = Mean effective pressure in N/m², L = Length of stroke in metres, A = Cross-sectional area of the piston in m², and N = Speed of the engine in revolutions per second (r.p.s)
P.L.A.N/2
P.L.A.N
2 × P.L.A.N
P.L.A.N/4
A heat treated glass generally used in automobiles bursts into ________ upon cracking,
Sharp edged fragments
Small particles
Large particles
None of these
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
The component in the radiator of an automobile that increases the boiling point of water is
Drain plug
Water jacket
Vacuum valve
Pressure cap
Caster is a
Forward tilt of the kingpin
Backward tilt of the kingpin
Either 'A' or 'B'
None of these
Which part of the automobile tyre is subjected to greatest flexing action?
Bead
Side wall
Shoulder
Tread
The ignition coil is used to
Step up current
Step down current
Step up voltage
Step down voltage
The number of exhaust manifolds in a V6 engine is
One
Two
Four
Eight
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
The clutch is located between the transmission and the
Engine
Rear axle
Propeller shaft
Differential
The Diesel engines as compared to petrol engines require
Bigger flywheel
Smaller flywheel
Same size of flywheel
No flywheel
The function of a second ring is that it is a
Back up compression ring which will work in place of the top ring when it is broken
Compression ring and aids the top ring in sealing and cooling
Back up oil control ring which will work in place of the bottom ring when it is broken
Cushion ring which prevents piston slap and knock
The connecting rods are generally made of ________ shaped crosssection.
I
C
L
H
The main function of an exhaust muffler is the
Optimisation of exhaust efficiency
Reduction of exhaust noise
Reduction of nitrogen oxide in the exhaust gases
Reduction of the exhaust gas volume
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
Which of the following oil is more viscous?
SAE 30
SAE 40
SAE 70
SAE 80
How many cells are used in a 12 volt car battery?
2
4
6
8