CAP 2 PISTON ENGINE PRICIPLES

Question 1

POWER

Answer 1

TORQUE X RPM

Question 2

TORQUE?

Answer 2

THE CAPACITY TO DO WORK ( LEVERAGE) ,MEASURED IN POUNDS /FOOT OR NEWTON METRES

T= FORCE X DISTANCE

Question 3

THE TORQUE COLD /WARM AIR?

Answer 3

IS MUCH HIGHER IN COLD WEATHER THAN WARMER .

AND IS INDICATION OF HOW MUCH POWER IS PRODUCING

Question 4

F=pressure x area changing and variable

Answer 4

AREA IS FIXED IN FORCE FORMULA SO WE CAN CHANGE ONLY THE PRESSURE MOVING THE ENGINE LEVER

Question 5

Torque and speed?

Answer 5

Torque and speed are inversely proportional

Question 6

Most used engine configuration

Answer 6

Horizontally configuration engines

Question 7

How many revolution for a full stroke cycle

Answer 7

For a four stroke engine, two revolution of the crank shaft needed

Question 8

STAGES OF ENERGY IN FOUR STROKE

Answer 8

1) chemical nergy
2) HEAT
3) PRESSURE
4) MECHANICAL ENERGY

Question 9

THE CHARGE

Answer 9

FUEL AIR MIXTURE IS CALLED “THE CHARGE”

Question 10

TDC

Answer 10

TOP DEAD CENTRE WHEN IS AT THE TOP OF THE EXTENTION

Question 11

BDC

Answer 11

BOTTOM DEAD CENTRE ,WHEN IS AT THE BOTTOM OF THE EXTENTION PHASE.

Question 12

DIFFERENCE BETWEEN TDC AND BTC

Answer 12

STROKE

Question 13

Diesel and petrol difference in strokes and bore

Answer 13

PETROL ENGINE HAS SMALL STROKE BUT GREAT PISTON BORE( AREA OF THE PISTON).
Diesel engines has large stroke but small piston bore.
Diesel has more torque

Question 14

Stroke and degrees in

Answer 14

1 stroke = 180 degrees

4 stroke = 720

Question 15

What is used to connect the piaston to the crankshaft

Answer 15

Connecting rod

Question 16

Crankshaft/camshaft

Answer 16

Crankshaft need do two revolution to have 1 revolution of the camshaft

Question 17

Theoretical cycle

Answer 17

Induction
Compression
Power
Exhaust

Question 18

Practical 4 stroke-cycle

Question 19

The ineffective crank angle

Answer 19

Smaller linear movement of piston compared to angular rotation of crankshaft at TDC and BDC

Question 20

Practical inlet opening

Answer 20

Inlet valve still open as compression stroke begins.
Because the angular rotaion of thecrankshaft is higher than lettle movemnt of the volume .so we keep the inlet valve open lit bit longer

Question 21

Valve over lap ( both valves open)

Inlet vale lead

Answer 21

During the exhaust stroke we open the inlet earlier to get some of new fresh air

Question 22

Exhaust valve lead

Answer 22

Exhaust valve is open before the end of the power stroke

Question 23

Exhaust valve lag

Answer 23

The exhaust valve remains opne until slighlty after tdc .

Exhaust gas exits under its own momentum

Question 24

Flame rate

Answer 24

60 to 80 ft/sec

Question 25

Advance ignition

Answer 25

Because not enough time to burn all the mixture

Question 26

Ignition timing

Answer 26

Just before TDC ,TDC, and just after TDC