Chapter 9

Question 1

Modern fire department pumpers are equipped with ________________ as
their main pump.

Answer 1

centrifugal pumps

Question 2

types of positive pressure pumps

Answer 2

piston pump, Rotary gear pump, rotary vane

Question 3

Positive-displacement pump using one or more reciprocating pistons to force water from the pump chambers.+

Answer 3

Piston pump

Question 4

Rotary pumps like rotary gear or rotary vane are confined to the uses of___________.

Answer 4

small capacity, booster-type pumps; low volume, high-pressure pumps; and priming pumps.

Question 5

____________ consist of two gears that rotate in a tightly meshed pat-tern inside a watertight case.

Answer 5

Rotary Gear Pump

Question 6

This is one of the most common types of pumps used to prime a centrifugal fire pump.

Answer 6

rotary vane pump

Question 7

A rotor with attached vanes is mounted off-center inside the pump housing; pressure is imparted on the water as the space between the rotor and the pump housing wall decreases.

Answer 7

rotary vane pump

Question 8

____________ are prone to failure if not exercised regularly. These pumps should be operated during routine apparatus checks.

Answer 8

rotary pumps

Question 9

Nearly all modern fire apparatus feature a ________________ as their main pump.

Answer 9

centrifugal pump

Question 10

Pump with one or more impellers that rotate and utilize centrifugal force to move the water. Most modern fire pumps are of this type.

Answer 10

centrifugal pump

Question 11

Vaned, circulating member of the centrifugal pump that transmits motion to the water.

Answer 11

Impeller

Question 12

intake orifice at the center of a centrifugal pump impeller.

Answer 12

Impeller eye

Question 13

Spiral, divergent chamber of a centrifugal pump in which the velocity energy given to water by the impeller blades is converted into pressure.

Answer 13

Volute

Question 14

What is the simplest form of all fire apparatus pumps?

Answer 14

rotary pumps

Question 15

How does a priming device get water into a centrifugal pump?

Answer 15

) removing air

Question 16

The total amount of water that can be pumped by a rotary gear pump depends on:

Answer 16

the size of the pockets in the gears and the speed of rotations

Question 17

Centrifugal pumps are classified as

Answer 17

non positive displacement pumps

Question 18

Centrifugal pumps impart:

Answer 18

velocity to the water and converts it to pressure within the pump itself.

Question 19

Which of the following pumps is the most efficient at pumping air?

Answer 19

) rotary vane pumps

Question 20

What part of the pump dictates the amount of pressure that is developed?

Answer 20

) the speed of the impeller

Question 21

Rear engine PTO designs are driven from

Answer 21

the engines flywheel

Question 22

If there is any question as to the correct position for the transfer valve, it is best to operate in the
parallel position rather than the series position which allows the pump to pump at

Answer 22

100% of its rated capacity at 10 feet of vertical lift and 20 feet of suction hosing

Question 23

Most fire departments operate pumpers that feature a pump that is mounted:

Answer 23

) laterally across the frame

Question 24

Midship mount pumps operate by shifting the collar inside the gear box so that power can be diverted

Answer 24

) from the rear axel and transmitted to the fire pump

Question 25

When the engine is at idle and the pump is engaged, the speedometer will indicate:

Answer 25

) 10-15 mph change

Question 26

When using a static water source, prime the pump by removing all the air from the pump which

Answer 26

lowers the atmospheric pressure within the pump casing

Question 27

When each of the impellers takes water from a source and delivers it to the discharge, you are
operating the transfer valve in what position?

Answer 27

parallel

Question 28

When all of the water from the intake manifold is directed into the eye of the first imepeller, you
would have the transfer valve in what position?

Answer 28

Series

Question 29

What valves are essential to the operation of a multi-stage pump?

Answer 29

Transfer valve

Question 30

Due to its self adjusting feature, rotary _____ pumps are more efficient at pumping air than rotary
_______.

Answer 30

vane; gear

Question 31

What form of energy is transmitted to the water by the impeller?

Answer 31

Pressure

Question 32

The engine’s piping typically tapers to a square shape in order to eliminate what?

Answer 32

Vortex

Question 33

What feature is designed to regulate the engine speed to match the pump discharge requirements?

Answer 33

Pressure Governor

Question 34

The pressure control device must restrict the pressure from exceeding what PSI above the set level?

Question 35

The electronic governor returns the engine to idle when the intake pressure drops below what PSI?

Answer 35

30

Question 36

Any device, usually a positive-displacement pump, used to exhaust the air from inside a centrifugal pump and the attached hard suction; this creates a partial vacuum, allowing atmospheric pressure to force water from a static source through the suction hose into the centrifugal pump.

Answer 36

Priming device

Question 37

Primers fall into several categories

Answer 37

Positive Displacement Primers,Oil-Less Primers,Exhaust Primers,Vacuum Primers,Air Primers

Question 38

Physical law stating that when a fluid, such as water or air, is forced under pressure through a restricted orifice, there is an increase in the velocity of the fluid passing through the orifice and a corresponding decrease in the pressure exerted against the sides of the constriction.

Answer 38

Venturi effect

Question 39

Two Types of Auxiliary Cooling Devices

Answer 39

The marine cooler,immersion type auxiliary cooler