A 150 cc engine has following parameter as 150 cc

• fuel tank capacity

• swept volume

• cylinder volume

• clearance volume.

Compression ratio of LC. engines is

• The ratio of volumes of air in cylinder before compression stroke and after compression stroke

• volume displaced by piston per stroke and clearance volume in cylinder

• ratio of pressure after compression and before compression

• swept volume/cylinder volume

The operation of forcing additional air under pressure in the engine cylinder is known as

• Scavenging

• Turbulence

• Supercharging

• Pre-ignition

The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft

• 1/2 (i.e. 0.5)

• 1

• 2

• 4

In a four stroke engine each cylinder has

• One valve

• Two valves

• Four valves

• Three valves

Pick up the wrong statement

• In 4-stroke engine, a power stroke is obtained in 4-strokes

• Thermal efficiency of 4-stroke engine is more due to positive scavenging

• Petrol engines occupy more space than diesel engines for same power output.

• Petrol engines work on otto cycle

Which of the following is not an interns combustion engine

• 2-stroke petrol engine

• 4-stroke petrol engine

• diesel engine

• steam turbine

The term scavenging is generally associated with

• 2-stroke cycle engines

• 4-stroke cycle engines

• aeroplane engines

• 6-stroke cycle engines

In four stroke engines the inlet valve opens, when piston at

• At TDC

• At BDC

The purpose of valve clearance is to

• Allow the sliding of valve in the guide

• Ensure that the crankshaft is free to rotate

• Allow the valve to expand

• Ensure that the valve closes fully