Which of the following options is correct about four-stroke engines when compared with two-stroke engines?
1
The thermodynamic cycle is completed in two strokes of the piston or in one revolution of the crankshaft.
2
Thermal efficiency is higher.
3
Light weight and simplicity due to absence of the valve actuating mechanism, with the initial cost of the engine being low
4
Lower volumetric efficiency due to lesser time taken for mixture intake