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
Correct Answer :
D. Fuel can be used in a test engine without knocking
Related Questions
The frequency of flashing of light per minute in a direction (side turn) indicator is about
9
90
900
9000
The function of oil control rings is that it
Lubricates the cylinder wall by releasing oil from its hole
Keeps the cylinder wall lubricated by holding oil in its channel
Prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan
Maintains a seal and prevents escape of burned gases and oil leakage
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 Diesel engines as compared to petrol engines require
Bigger flywheel
Smaller flywheel
Same size of flywheel
No flywheel
The rating of C.I. engine fuel (Diesel) is given by
Octane number
Performance number
Cetane number
None of these
The connecting rods are generally made of ________ shaped crosssection.
I
C
L
H
The function of antilock brake system (ABS) is that is
Reduces the stopping distance
Minimises the brake fade
Maintains directional control during braking by preventing the wheels from locking
Prevents nose dives during braking and thereby postpones locking of the wheels
The power source for a brake booster is
Exhaust manifold pressure
Electricity
The pressure difference between the atmospheric pressure and the vacuum pressure in the intake manifold
Hydraulic pump
The correct way to rectify an imbalanced wheel is to
Adjust the tyre pressure
Rotate the tyres
Adjust the damper spring tension
Attach appropriate weights to the wheel at appropriate positions
The component that connects the steering rack to the knuckles is
Tie rod
Sector gear
Pivot
Spline
A basic difference between the spark ignition engine and the Diesel engine is that the
Diesel engine compresses air alone instead of an air-fuel mixture
Air temperature ignites the fuel in the Diesel engine
Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke
All of the above
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
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 timing belt is attached to the camshaft pulley and
Timing belt drive pulley
Distributor
Radiator fan pulley
Alternator pulley
The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is
Brake pedal, master cylinder, brake lines, vacuum servo mechanism, brake pads
Brake pedal, vacuum servo mechanism, master cylinder, brake lines, brake pads
Brake pedal, master cylinder, vacuum servo mechanism, brake lines, brake pads
Brake pedal, brake lines, vacuum servo mechanism, master cylinder, brake pads
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 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
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
If clearance volume of I.C. engines is increased, the compression ratio will
Increase
Decrease
Remain constant
Be doubled
What type of bearing is used for main bearings and connecting rod bearings?
Ball bearings
Plain bearings
Needle roller bearing
Taper roller bearing
The lubrication oil flow in an engine is in the order as
Oil strainer, oil pump, relief valve, oil filter, cylinder block, cylinder head and oil pan
Oil pump, oil strainer, relief valve, oil filter, cylinder block, cylinder head and oil pan
Oil strainer, oil filter, relief valve, oil pump, cylinder block, cylinder head and oil pan
Oil strainer, oil pump, relief valve, oil filter, cylinder head, cylinder block and oil pan
The specific gravity of acid in a fully charged battery is generally
1.00
1.28
1.82
2.81
Cushioning springs in clutch plate reduces
Vehicle speed
Torsional vibrations
Jerky starts
None of these
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
The octane rating of petrol commercially available is
85-95
95-100
100-110
110-125
The basic purpose of a four wheel drive (4WD) system is that it
Delivers improved cornering on dry road surfaces
Eliminates the need of snow tyres, tyre chains, etc.
Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Ensures that effective braking can be performed, even on slippery surfaces
The calorific value of petrol is about
36.5-38.5 MJ/kg
39.4-42.5 MJ/kg
42.7-43.5 MJ/kg
45.5-47 MJ/kg
The connecting rod is attached to the piston by the
Cap bolt
Piston pin
Cap roller bearing
Rod cap
The valve overlap in four stroke petrol engines is approximately
30°
60°
90°
120°
The engine oil is stored in __________ when the engine is not running.
Oil pan
Cylinder head
Oil pump
Separate oil tank