The ignition coil is used to
Step up current
Step down current
Step up voltage
Step down voltage
Correct Answer :
C. Step up voltage
Related Questions
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 connecting rod lower end is connected to the relevant ________ of crankshaft.
Big end
Crank arm
Journal
Small end
In automobiles G.V.W. refers to
Gross vehicle width
Gross vehicle weight
Gross vehicle wheel base
Gross vehicle wheel track
The minimum parking brake force is generally ________ of gross vehicle mass (GVM).
5 %
10 %
15 %
20 %
Which of the following oil is more viscous?
SAE 30
SAE 40
SAE 70
SAE 80
The antiknock property of compression ignition engine fuel can be improved by adding
Tetraethyl lead
Trimethyl pentane
Amyl nitrate
Hexadecane
The rating of C.I. engine fuel (Diesel) is given by
Octane number
Performance number
Cetane number
None of these
If clearance volume of I.C. engines is increased, the compression ratio will
Increase
Decrease
Remain constant
Be doubled
Bead wires are made of
Steel
Copper
Zinc
Aluminium
The cetane number of a Diesel fuel is a measure of
Volatility
Viscosity
Ignition quality
Delay period
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 commonly used antifreeze solution in automobiles is
Carbon disulphide
Ethylene glycol
Ammonium chloride
Freon-12
The operation of removing trapped air from the hydraulic braking system is known as
Trapping
Tapping
Bleeding
Cleaning
A petrol engine of a car develops 125 Nm torque at 2700 r.p.m. The car is driven in second gear having gear ratio of 1.75. The final drive ratio is 4.11. If the overall transmission efficiency is 90%, then the torque available at the driving wheels is
8.091 Nm
80.91 Nm
809.1 Nm
8091 Nm
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
Which of the following indicates multigrade oil?
SAE 30
API SF
SAE 20 W50
API 50
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
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
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 torque available at the contact between driving wheels and road is known as
Brake effort
Tractive effort
Clutch effort
None of these
The component that is responsible for converting the rotation of the steering wheel into lateral motion is the
Steering wheel
Steering shaft
Steering gearbox
Tie rod
The calorific value of Diesel is about
36.5 MJ/kg
38.5 MJ/kg
42.5 MJ/kg
45.5 MJ/kg
The main function of the tread pattern on tyre is that
The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
The crests between the tread grooves absorb road noise
In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
The tread pattern protects the tyre's inner carcass from small stones and pieces of glass
The characteristic that is enhanced by the use of cylinder sleeves is
Cooling efficiency
Resistance to wear
Lubrication performance
None of these
The best fuels for compression ignition engines are
Straight chain paraffin
Aromatics
Branched chain paraffin
Naphthalene
The specific gravity of petrol is about
0.75
0.85
0.95
1.25
The component in the radiator of an automobile that increases the boiling point of water is
Drain plug
Water jacket
Vacuum valve
Pressure cap
When the piston is at T.D.C, the volume above the piston in the combustion chamber is the
Clearance volume
Cylinder volume
Exhaust volume
None of these
Tachometer in a vehicle measures
Speed
Distance
Engine r.p.m.
Fuel consumption
The specific gravity of Diesel is about
0.65
0.75
0.85
0.95