Pumps handling cryogenic materials operate
a) as staged units
b) at extremely low temperatures
c) nearly always as dynamic units
d) as tandem units
e) as high speed units
Answer: B
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Power Engineering Chapter 73
- Turbine pumps are best suited for
- A positive displacement stand by-pump will have
- If a pump is cavitating what can you do to prevent or reduce the cavitation?
- Rotary pumps: 1. have tight clearances on all moving parts 2. deliver high pressure liquid without pulsations 3. are positive displacement units 4. should not be started with discharge closed
- Cavitation of a pump refers to, when:
- Turbine pumps: 1. are high capacity pumps 2. are high pressure pumps 3. has the liquid gain energy in a number of impulses
- A diffuser pump: 1. has stationary guide vanes surrounding the impeller 2. has a higher efficiency than a volute type 3. has high suction lift 4. does not have to be primed
- A double-acting pump
- Rotary pumps: 1. are high pressure pumps 2. must be primed 3. use mechanical seals 4. are positive displacement pumps
- The total static head of a pump
- The vertical distance from the liquid surface up to the pump centre-line plus the vertical distance from the pump centre-line up to the surface of the liquid in the discharge tank is
- A circulating pump is usually:
- When a pump discharges into a vessel operating at 300 kPa, the 300 kPa is referred to as:
- The difference between static suction head and static discharge head is:
- A pump is capable of suction lift due to:
- A hot water heating system circulator should:
- Rotary pumps:
- The name given to the category of pumps that use gear teeth, vanes, or lobes to move the fluid being pumped is the _____ type.
- When a reciprocating pump delivers fluid every second stroke of its piston, it is called a ___________ pump:
- Centrifugal pumps do not develop good suction lift because:
- Preferably, dynamic pumps should be located _____ the liquid source.
- It is generally accurate to say that:
- Centrifugal pumps convert rotating mechanical energy into kinetic energy then:
- A diffuser pump: