Answer:
1/2
Explanation:
Lets take N is the speed of engine in RPM.
As we know that in two stroke engine ,crank rotates one times in two stroke of piston.Every rotation of crank gives one power stroke.It means that two stroke give one power stroke.
On the other hand in four stroke engine,crank rotates two times in 4 stroke of piston.It means that 4 stroke of piston gives one power stoke .
So we can say that the ratio of number of power stroke in two stroke engine to the number of power stroke in four stroke engine is 1/2.
This question is incomplete, the complete question is;
the water depths upstream and downstream of a hydraulic jump is 0.3 m and 1.2 m. Determine flow rate ( in m³ ) if the rectangular channel is 20 m wide.
Answer:
the flow rate is 32.549 m³/sec
Explanation:
Given that
y₁ = 0.3 m
y₂ = 1.2 m
β = 20 m
Now for Rectangular Channel, we know that;
2q²/g = y₁y₂( y₁ + y₂)
where g = 9.81 m/s²
and q = Q/β
so
2(Q/β)²/g = y₁y₂( y₁ + y₂)
we substitute our given values
2(Q/20)²/9.81 = 0.3 × 1.2( 0.3 + 1.2)
2(Q²/400)/9.81 = 0.36(1.5)
2(Q²/400) = 0.54 × 9.81
Q²/400 = 5.2974 / 2
Q²/400 = 2.6587
Q² = 1059.48
Q = √1059.48
Q = 32.549 m³/sec
Therefore the flow rate is 32.549 m³/sec