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Engineer Test > Old Test Questions > Flashcards

Old Test Questions Flashcards

1
Q

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

A

150 psi

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2
Q

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

A

Liquid surge

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3
Q

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 ______

A

Angle of departure

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4
Q

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 _____

A

Angle of approach

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5
Q

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 _____

A

Ramp breakover angle

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6
Q

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

A

Approximately 17 feet.

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7
Q

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

A

1000 gallons

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8
Q

Minimum requirements for a fire department pumper

A

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

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9
Q

The main purpose of a relief valve is to ______

A

Relieve excessive pressure within the pump discharge

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10
Q

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

A

Back to the pump intake

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11
Q

When atmospheric pressure decreases, pumping ability ______

A

Decreases

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12
Q

2 methods of relay pumping

A

Maximum distance, constant pressure

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13
Q

Tank to Pump Flow Test

A

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.

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14
Q

Maximum Lift Formula

A

L = 1.13 x inches of Mercury

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15
Q

Minimum dump flow rate of a tender per NFPA 1901

A

1000 gpm for the first 90% of the tank

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16
Q

Formula for area of a circle

A

A = Pi x R squared

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17
Q

What is the primary function of an auxiliary cooling system?

A

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

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18
Q

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?

A

43.4 psi (1 foot = .434 psi)

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19
Q

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

A

Pump intake

20
Q

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

A

33.9 feet

21
Q

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

A

250 psi for 10 minutes

22
Q

Operating engines below the minimum coolant temperature may result in _____

A

Inefficient combustion

23
Q

Which primer uses the venturi principle?

A

Exhaust primer

24
Q

Minimum water main size for business and industrial districts

A

8”

25
Q

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

A

Distributor

26
Q

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

A

60%

27
Q

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

A

Yes

28
Q

Disc brakes have ______ pad to rotor contact.

A

15%

29
Q

Drum brakes have _____ pad to rotor contact.

A

90%

30
Q

List 5 conditions that can cause an inability to draft

A

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

31
Q

The spinning impeller creates ______

A

Flow

32
Q

The impeller spins on a ______

A

Shaft

33
Q

The rotary vane is a type of ______

A

Positive displacement pump (primer)

34
Q

Water enters the impeller through the ______

A

Eye

35
Q

The dump valve discharges excess incoming pressure to the ______

A

Ground

36
Q

The first air tank in the air brake system is called the ______

A

Wet tank

37
Q

Drum brakes are actuated from the slack adjuster to the _____

A

S-cam

38
Q

When rotors or drums heat up and effect brake performance, this is known as _____

A

Brake fade

39
Q

The valve that actuates the relief valve is called the _____

A

4-way valve

40
Q

Another name for tandem pumping

A

Short relay

41
Q

Rule of Thumb for Theoretical Lift

A

For every inch of Hg, water can be lifted 1 foot

42
Q

If you double the size of the orifice, you decrease velocity _____

A

4 times

43
Q

If you reduce the size of the orifice by 3 times, you increase velocity by _____

A

9 times

44
Q

Centrifugal pumps make terrific fire pumps in that they have 100% ______

A

Slippage

45
Q

The most common type of positive displacement pump used in priming pumps are ____

A

Rotary vane

46
Q

Centrifugal pumps take advantage of ______

A

Positive intake pressure

Engineer Test (12 decks)

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