Answer:
Explanation:
speed of motor (N)=1500 rpm
power=4 hp = 
=2.9828 KW
service factor(k)= 2.75
now,
torque rating
Question:
1. Some are known as "nun" buoys
2. They are labeled with odd numbers
3. If it is lighted, the light color is green
4. Some are known as "can" buoys
Answer:
The correct option is;
1. Some are known as "nun" buoys
Explanation:
Based on the lateral system, on the starboard side, one can find the red even numbered marks while the odd-numbered, green, marks are located on the port side of a channel such that the buoy numbers increase as a vessel travels upstream.
The red buoys are cones shaped in appearance and have triangular reflective sign markings embossed and they are of different types included in the order of lower water depth
1. NUN buoy
2. Lighted buoy
3. Light
4. Day beacon
Therefore, the correct option is 1. Some are known as "NUN" buoys.
Answer:
Throat diameter 
=28.60 mm
Explanation:
Bore diameter 
⇒
Manometric deflection x=235 mm
Flow rate Q=240 Lt/min⇒ Q=.004
Coefficient of discharge 
=0.8
We know that discharge through venturi meter
=13.6 for Hg and 
=1 for water.
h=2.961 m
Now by putting the all value in
⇒=28.60 mm
So throat diameter =28.60 mm
