Process Control Valves multiple choice questions

 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
Answer: 20m/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
Answer: 94.2L/s
3. How many ports does a 3 way valve have?
a) 1
b) 2
c) 3
d) 4
Answer: 3
4. How many exit ports does a 2 way valve have?
a) 1
b) 2
c) 3
d) 4
Answer: 1
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
Answer: 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%
Answer: 20%
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%
Answer: 50%
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%
Answer: 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
Answer: True
10. Pneumatic actuator based valves use air to generate rotational force.
a) True
b) False
Answer: True
11. In “Butterfly valves” the flow can be switched and controlled by rotating the obstructer in 90 degrees.
a) True
b) False
Answer: True
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
Answer: Butterfly 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
Answer: Plug Valves