POWERPLANT - THE ENGINE

Question 1

POWER

Answer 1

Rate at which energy is being transformed

Question 2

BRAKE HORSEPOWER

Answer 2

is the actual horsepower delivered by the
ENGINE

Question 3

THRUST HORSEPOWER

Answer 3

is the actual horsepower delivered by the
PROPELLER of an airplane to the air

Question 4

RECIPROCATING ENGINE

Answer 4

The “BACK-AND-FORTH” movement of the
pistons which produces MECHANICAL ENERGY

Question 5

PISTON

Answer 5

Aluminum alloy pistons fit tightly in the cylinder.
* Compresses fuel/air mixture
* Receive the chemical energy from expansion of gases

Question 6

BORE

Answer 6

Diameter of the PISTON

Question 7

CONNECTING ROD

Answer 7

Attached to the crank pin of the piston
* Transfer energy from the piston to the crankshaft

Question 8

CRANKSHAFT

Answer 8

Convert the energy from piston into rotary motion

Question 9

VALVE GEAR

Answer 9

CAMSHAFT – PUSHROD – VALVE

Question 10

CAMSHAFT

Answer 10

Driven through a camshaft gear by the crankshaft.

Always rotates at half the speed of the engine crankshaft and operates the valves via the push rods.

Question 11

INTAKE/EXHAUST VALVE

Answer 11

-Intake and exhaust valves are mounted in the cylinder head.
- Valves close under spring pressure and are opened by the camshaft via the valve operating gear.
- Inlet valve is normally larger than the exhaust valve

Question 12

SPARK PLUGS

Answer 12

2 spark plugs per cylinder.
* In-built redundancy increases safety.
* Smoother, quicker, more efficient combustion

Question 13

ENGINE (VOLUME) DISPLACEMENT

Answer 13

V = AREA OF BORE x STROKE x NO. OF CYLINDER