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22 Cards in this Set
- Front
- Back
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The ___ of an impeller are curved away from the direction of rotation so that the natural movement of water will carry it to the edge.
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Vanes
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The ___ is the major component of the centrifugal pump because it provides velocity to the water.
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impeller
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The device that controls pressure surges by changing engine speed to compensate for changes in flow is called a:
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pressure governor
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Pressure control devices must operate within ___ with an increase of 30 psi.
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3 to 10 seconds
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A pressure governor operates by:
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Controlling truck engine speed depending on pump pressure.
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Centrifugal fire pumps may make use of:
Select one: a. air in suction lines. b. positive intake pressures. c. negative intake pressures. d. hose size and length. |
b. positive intake pressures.
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Operating engines below the minimum coolant temperature may result in: Select one:
a. excessive cylinder wear. b. inefficient operation. c. decreased valve deposits. d. decreased fuel consumption. |
b. inefficient operation.
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In the fire service, each impeller in a housing is commonly called a: Select one:
a. casing. b. body. c. pump. d. stage. |
D. stage
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Pumps that are commonly used as priming pumps are known as: Select one:
a. centrifugal. b. piston. c. rotary gear. d. rotary vane. |
d. rotary vane
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The spiral chamber of a centrifugal pump in which the velocity given to water by the impeller is converted into pressure is called the: Select one:
a. body. b. discharge housing. c. casting d. volute. |
d. volute
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A ___ valve is used to relieve pressure in hose lines after the discharge gates. Select one:
a. discharge b. drain c. by-pass d. relief |
b. drain
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Which of the following types of fire pumps must be primed using an external priming device? Select one:
a. rotary vane b. piston c. centrifugal d. rotary-gear pump |
c. centrifugal
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Switch from pressure to volume operation when:
a. operating from a hydrant. b. it is expected that more than half of the rated capacity of the pump will be required. c. a higher than normal pressure will be required. d. Both A and B are correct. |
b. it is expected that more than half of the rated capacity of the pump will be required.
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A relief valve:
a. closes as lines are shut down. b. opens when pressure rises above a set pressure. c. opens as lines are opened. d. is always open when the pumper is in use. |
b. opens when pressure rises above a set pressure.
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An auxiliary cooling device:
a. causes pump water to mix with radiator fluid. b. can cause over pressurization of radiator. c. gets its water from the intake side of the pump. d. cools engine water when the apparatus pump is engaged. |
d. cools engine water when the apparatus pump is engaged.
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To achieve rated capacity of a pump, it must be operated in the ___ position. a. relay capacity
b. series Incorrect c. pressure d. parallel. |
d. parallel
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The operation in which EACH impeller of a centrifugal pump discharges into a common outlet is known as:
a. parallel. b. single stage. c. series. d. pressure. |
a. parallel
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Excessive engine temperatures during pumping operations can be controlled by using the:
a. tank-to-fill valve. b. auxiliary cooler. c. radiator cooler. d. immersion bypass. |
b auxiliary cooler
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In an auxiliary cooling system, heat is transferred from the engine cooling water to the:
a. transmission cooler. b. radiator. c. pump discharge. d. pump water. |
d. pump water
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Which primer uses the venturi principle?
a. Exhaust primer b. Rotary-gear primer c. Rotary-vane primer d. Vacuum primer |
a. exhaust primer
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The main purpose of a relief valve is to:
a. relieve excessive pressure within the pump. b. allow increase to pump discharge. c. transfer excessive pressure back to the booster tank. d. prevent the increase in pump discharge pressure when not pumping. |
a. relieve excessive pressure within the pump.
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Priming devices used on modern centrifugal fire pumps most often are:
a. small positive displacement pumps. b. used to boost pump pressure. c. used for supply from a hydrant. d. used all the time. |
a. small positive displacement pumps.
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