30 câu hỏi
An engine is a machine designed to convert one form of ________ into mechanical energy?
Chemical energy
Power
Energy
Mechanism
Heat engines burn a ________ to create heat which is then used to do work.
Liquid
Material
Fuel
Coal
Combustion process of the air-fuel mixture is ________ by a spark from a spark plug.
Ignited
Ignitted
Ignition
Ignite
Piston is a cylindrical unit, used to compress the charge during ____________
Compression stroke
Compression cycle
Intake stroke
Stroke
The pistons of IC engines are usually made of ______________
Iron cast
Aluminium alloy
Stainless steel
Aluminium
The ___________ is called the backbone of an engine
Crankshaft
Camshaft
Driveshaft
Valves
The major function of the camshaft is to operate the ___________ valves
Inlet and exhaust
Intake and exhaust
Exhaust
A & B
The camshaft is __________ by crankshaft at half the speed of the crankshaft
Driven
Drive
Driving
Steering
Fuel and air is compressed in the ________________ chamber
Combustion
Heat
Air
Fuel
The function of crankcase in two stroke petrol engines is _________
It lower downs the temperature
It forms a pressurised chamber for fuel air mixture
It holds the exhaust gases after combustion
None of the mentioned
Connecting rod is attached to the piston by the ___________
Rod cap
Piston pin
Cap bolt
Lower cap
Engine pistons are generally made of aluminium alloy because ______
It is lighter
It is stronger
It has less wear
It absorbs shock
Piston compression rings are made of _____________
Cast iron
Steel
Aluminium
Bronze
What type of material is used for Gudgeon pin?
Cast iron
Aluminium
Steel alloy of high strength
Hardened and ground steel
When no.1 piston of a four cylinder in line four stroke engine is performing the power stroke, no.4 piston is on the stroke called _______
Suction
Compression
Power
Exhaust
Two stroke engine is preferred for small vehicle because
Fuel consumption is low
Shock and vibrations are less
Its size is small
It is easy to control
The size of intake valve is
Smaller than that of the exhaust valve
Equal to that of the exhaust valve
Larger than that of the exhaust valve
Not depending upon the size of exhaust valve
A negative loop in the P.V diagram of an IC engine is due to
Pre ignition in the engine
Suction of air for engine
Pre opening of the exhaust valve
High pressure in the cylinder
Piston displacement is calculated from the
Cylinder diameter and length
Piston length and diameter
Bore and stroke
The range of gear ratios in a vehicle depends on
The ratio of engine H.P to laden weight of vehicle
Max. engine torque/wt. of vehicle
Only on the laden weight of vehicle
The power to weight ratio of engine
If compression ratio is increased
Thermal efficiency will be increased
Volumetric efficiency will be increased
Air standard efficiency will be decreased
Air standard efficiency will be increased
The combustion process in a diesel engine is
Constant pressure process
Isothermal process
Constant volume process
Adiabatic process
The temperature of the compressed air should be __________________ of the fuel
Below the flash point
Above the flash point
Above the flash point
Between the fire and flash point
The purpose of crankcase ventilation is to __________
Cool the oil
Remove vaporised water and fuel
Supply oxygen to the crankcase
It assists in maintaining the viscosity of oil
The purpose of a piston pin is that _________
It prevents the valve from rotating
It links the connecting rod to the crankshaft
It ensures the piston ring to the piston
It connects the piston to the connecting rod
The engine produces mechanical power that is transmitted to the automobile’s wheels through a __________
Suspension system
Wheel system
Drivetrain system
All correct
_________ systems provide control over direction and speed.
Drivetrain
Steering and braking
Wheel system
Suspension system
The piston _____ in the cylinder bore to evacuate the combustion chamber.
Moves downward
Descends
Passes from a higher to a lower place
All correct
A petrol engine, whether four- or two-stroke, is called a _____
Electrical Ignition engine
Compressed Ignition engine
Spark Ignition engine
All correct
There are two methods by which fuel is injected into a combustion chamber, they are _____.
Blowing & intaking
Compressing & exhausting
Direct or indirect injection
All correct