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Flashcards in Old Test Questions Deck (46)
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1

When performing a capacity test, the first desired pump pressure should be _______

150 psi

2

A force imposed upon a fire apparatus by partially filled water tanks due to stopping and turning is called a _____

Liquid surge

3

The angle from the rear point of ground contact of the rear tire to any projection of the apparatus behind the rear axle is called ______

Angle of departure

4

The angle formed by level ground and a line from the point where the front tires touch the ground to the lowest projection at the front of the apparatus is called _____

Angle of approach

5

The angle formed by level ground and a line from the point where the rear tires touch the ground to the bottom of the frame at the wheelbase midpoint is called _____

Ramp breakover angle

6

An operator obtains a reading of 17" of Mercury on the intake gauge while drafting and flowing water which indicates a lift of _____.

Approximately 17 feet.

7

A mobile water supply apparatus is equipped with a minimum tank capacity of _____

1000 gallons

8

Minimum requirements for a fire department pumper

Minimum pump capacity of 750 gpm and minimum tank of 300 gallons

9

The main purpose of a relief valve is to ______

Relieve excessive pressure within the pump discharge

10

Where does the water go when the relief valve is activated?

Back to the pump intake

11

When atmospheric pressure decreases, pumping ability ______

Decreases

12

2 methods of relay pumping

Maximum distance, constant pressure

13

Tank to Pump Flow Test

Apparatus with water tanks less than 500 gallons must provide TTP flow rate of 250 gpm. Apparatus with greater than 500 gallons must provde TTP flow rate of 500 gpm.

14

Maximum Lift Formula

L = 1.13 x inches of Mercury

15

Minimum dump flow rate of a tender per NFPA 1901

1000 gpm for the first 90% of the tank

16

Formula for area of a circle

A = Pi x R squared

17

What is the primary function of an auxiliary cooling system?

Control the temp of coolant in the apparatus engine during pumping operations

18

A 1 square inch column contains water to a height of 100 feet. What is the pressure in psi at the base of the column?

43.4 psi (1 foot = .434 psi)

19

A relief valve by-passes water from the discharge side of the pump to the ______

Pump intake

20

Theoretically, the maximum lift for a pump at sea level is _____

33.9 feet

21

The 50% pump capacity test is conducted at a net PDP of ______ for _____ minutes.

250 psi for 10 minutes

22

Operating engines below the minimum coolant temperature may result in _____

Inefficient combustion

23

Which primer uses the venturi principle?

Exhaust primer

24

Minimum water main size for business and industrial districts

8"

25

In a water distribution grid, the pipe that supplies individual hydrants and blocks of consumers is called a _____

Distributor

26

Pump capacity for a 20' lift (drafting) at sea level

60%

27

Is a dump valve the same thing as an intake relief valve?

Yes

28

Disc brakes have ______ pad to rotor contact.

15%

29

Drum brakes have _____ pad to rotor contact.

90%

30

List 5 conditions that can cause an inability to draft

Drain valves open, intake valves open, dump valve not plugged, suction hose leaking, primer not run long enough, RPM's not high enough, loose pump packing, strainer not submerged, in "pressure" instead of "RPM" mode