Ch. 13 Flashcards
1
Q
- An open, cylindrical tank contains a liquid to a height of 7.5 metres. If the density of the liquid is 4.5 x 103 kg/m3, what is the pressure exerted by the liquid at the bottom of the tank in kPa?
a. 331
b. 352
c. 250
d. 400
A
a. 331
2
Q
- An open, cylindrical tank contains a liquid to a height of 10 metres. If the density of the liquid is 4.0 x 103 kg/m3, what is the pressure exerted by the liquid at the bottom of the tank in kPa?
a. 331
b. 392
c. 259
d. 400
A
b. 392
3
Q
- A pressure gauge is located in the side of a tank at 2 m up from the bottom, which is the minimum tank level to ensure suction to the pumps. If the gauge reads 260 kPa and the level in the tank is 8 m, what is the density of the liquid in the tank?
a. 3.225 X 103
b. 4.022 X 103
c. 4.417 X 103
d. 5.332 X 103
A
c. 4.417 X 103
4
Q
- A pressure gauge is located in the side of a tank at 3.5 m up from the bottom, which is the minimum tank level to ensure suction to the pumps. If the gauge reads 300 kPa and the level in the tank is 12 m, what is the density of the liquid in the tank?
a. 3.225 X 103
b. 4.022 X 103
c. 4.417 X 103
d. 3.6 X 103
A
d. 3.6 X 103
5
Q
- A process solution has a density of 3.4 x 103 kg/m3 and is held in a rubber-lined tank that is 9 metres high. If the tank is exactly 2/3 full, what reading, in kPa, would the operator see on a level-indicating pressure gauge, located at the base of the tank in kPa?
a. 200
b. 235
c. 250
d. 300
A
a. 200
6
Q
- What height of water is necessary to exert a pressure of 1 kPa at a temp of 150°C (note Vf = 1.0905 cm3/g)
a. 0.189 m
b. 0.234 m
c. 0.1112 m
d. 0.0034 m
A
c. 0.1112 m
7
Q
- The pressure at the discharge of a water pump is 150 kPa and the temperature of the water is 80°C. Find the equivalent head in metres.
a. 20.21 m
b. 12.55 m
c. 18m
d. 15.73 m
A
d. 15.73 m
8
Q
- If a column of mercury has an equivalent head of 50 cm., calculate the pressure produced at the bottom of the column in kPa. Relative density of mercury is 13.6.
a. 66.7
b. 73.4
c. 81.24
d. 55
A
a. 66.7
9
Q
- A raw water supply pump is sitting idle with its discharge valve open. The equivalent discharge head is known to be 35 metres and the water is at 70°C. What pressure, in kPa, should be indicating on the pump discharge gauge? (Given vf at 70°C = 1.0228)
a. 350
b. 336
c. 380
d. 320
A
b. 336
10
Q
- A chemical in a storage tank has a relative density of 7.60. What is the equivalent head at the outlet of the tank where a pressure gauge reads 250 kPa?
a. 4.0 m
b. 5.2 m
c. 3.35 m
d. 4.55 m
A
c. 3.35 m
11
Q
- A rotary pump draws oil from a waste collection sump and delivers it into a storage tank. The level in the sump is 2 m below the base of the storage tank and the level in the tank is 4.5 m. If the pump sits 1m above the tank base and discharges into the side of the tank at a height of 3 m, what is the total static head on the pump?
a. 6.5 m
b. 7.2 m
c. 5.2 m
d. 6.0 m
A
a. 6.5 m
12
Q
- A deaerator has a pressure of 100 kPa and supplies feedwater to a boiler which operates at 1200 kPa. If the standby feedwater pump is located 7 meters below the water level in the dearator and 6 m below the water level in the boiler, what is the total head on the pump. Ignore the feedwater temperature.
a. 112.2 m
b. 111.2 m
c. 110.2 m
d. 1 m
e. 13 m
A
b. 111.2 m
13
Q
- Static suction lift means:
a. Static that builds up due to liquid moving in a pipe
b. The vertical distance from the liquid supply level to the pump center line when the pump is above the supply level
c. The vertical distance from the liquid supply level to the pump center line when the pump is below the supply level
d. The method by which the pump lifts water
e. The vertical distance form the liquid supply level to the pump discharge point
A
b. The vertical distance from the liquid supply level to the pump center line when the pump is above the supply level
14
Q
- Friction head means:
a. Friction due to the head of water in the pipe
b. The pressure expressed in metres of head required to overcome friction caused by liquid flow through piping, valves and fittings in the system
c. The sum of dynamic suction lift and dynamic discharge head
d. Friction caused by the impeller moving in the casing
e. The difference between the dynamic discharge head and the dynamic suction lift
A
b. The pressure expressed in metres of head required to overcome friction caused by liquid flow through piping, valves and fittings in the system
15
Q
- Velocity head means:
a. The pressure, in metres of liquid head, required to give the liquid its motion through the system at a given velocity
b. The speed at which the water leaves the pump
c. The speed at which the water enters the pump
d. The distance the liquid must travel in a given amount of time
e. The speed at which the pump impeller is turning
A
a. The pressure, in metres of liquid head, required to give the liquid its motion through the system at a given velocity