General Flashcards
A manifold pressure gauge of a piston engine measures?
Absolute pressure in intake system behind the throttle valve
Diesel engines always produce a certain amount of soot, because?
The fuel droplets coming from the atomiser do not burn completely.
Prior to starting a reciprocating engine at sea level the manifold pressure gauge usually indicates approximately 29 inch Hg. This is because the?
pressure in the manifold is the same as atmospheric pressure.
The part of a piston engine that transforms reciprocating movement into rotary motion is called the?
Crankshaft
The thermal efficiency of a piston engine is about?
30%
For a piston engine, specific fuel consumption is defined as the?
Mass of fuel required to produce unit power for unit time.
The swept volume is?
The length of the stroke x the piston crown area
The crank assembly of a piston engine comprises the?
Crankshaft, connecting rods and pistons.
The thermal efficiency of a diesel engine is higher than that of a petrol engine because?
The compression ratio is much higher.
The power output of a diesel engine without a turbo charger is regulated by?
Fuel flow only
In reference to piston engines, what is meant by the term ‘swept volume’?
The volume displaced by the piston during a single.
The torque of an aeroplane engine can be measured at the?
Gear box, which is located between the engine and the propeller
A piston engine compression ratio is the ratio of the?
total volume to the clearance volume.
The formula to calculate the total displacement of a multi-cylinder piston engine is?
Piston area x piston stroke x number of cylinders
the power output of a piston engine is directly proportional to?
torque and RPM.
