Process Control Valves

1. What is the velocity of water from a cylindrical valve if the cylindrical valve has a diameter of 10 cm and rate of flow of water in Litres per second is 157L/s?
a) 40m/s
b) 30m/s
c) 20m/s
d) 30m/s
2. What is the rate of flow of water in Litres per second from a cylindrical valve if the cylindrical valve has a diameter of 10 cm and velocity of water is 12m/s?
a) 100L/s
b) 127L/s
c) 157L/s
d) 94.2L/s
3. How many ports does a 3 way valve have?
a) 1
b) 2
c) 3
d) 4
4. How many exit ports does a 2 way valve have?
a) 1
b) 2
c) 3
d) 4
5. What is the final amount of water flowing through a valve in one hour when originally the rate of flow from the valve was 10m3/hr which was reduced by 80%?
a) 3m3/hr
b) 4m3/hr
c) 5m3/hr
d) 2m3/hr
6. What is the percentage change in amount of water flowing through a valve in one hour when originally the rate of flow from the valve was 10m3/hr which was reduced to 8m3/hr?
a) 50%
b) 60%
c) 20%
d) 800%
7. What is the percentage change in amount of water flowing through a valve in one hour when originally the rate of flow from the valve was 10 m3/hr which was reduced to 5m3/hr?
a) 50%
b) 60%
c) 20%
d) 100%
8. What is the percentage change in amount of water flowing through a valve in one hour when originally the rate of flow from the valve was 15m3/hr which was reduced to 5m3/hr?
a) 50%
b) 60%
c) 20%
d) 66.67%
9. In “two way ball valves” the flow can be switched and controlled by rotating the ball in 90 degrees.
a) True
b) False
10. Pneumatic actuator based valves use air to generate rotational force.
a) True
b) False
11. In “Butterfly valves” the flow can be switched and controlled by rotating the obstructer in 90 degrees.
a) True
b) False
12. Which type of valves contains a flat disc obstructer?
a) Butterfly valves
b) Two way ball valves
c) Three way ball valves
d) Plug Valves
13. What is the rate of flow of water from a cylindrical valve if the cylindrical valve has a diameter of 10 cm and velocity of water is 10m/s?
a) 3.92 * 10-3 m3/s
b) 3.92 * 10-2 m3/s
c) 7.85 * 10-2 m3/s
d) 7.85 * 10-3 m3/s
Answer: 7.85 * 10-2 m3/s
14. What is the rate of flow of water from a cylindrical valve if the cylindrical valve has a diameter of 10 cm and velocity of water is 5m/s?
a) 3.92 * 10-3m3/s
b) 3.92 * 10-2m3/s
c) 4.92 * 10-2m3/s
d) 4.92 * 10-3m3/s
Answer: 3.92 * 10-2m3/s
15. Which type of valves contains tapered cylindrical obstructer?
a) Butterfly valves
b) Two way ball valves
c) Three way ball valves
d) Plug Valves