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Engineer Test > Engineer Resource Manual > Flashcards

Engineer Resource Manual Flashcards

1
Q

Stopping distance increases by how much in rainy, wet conditions?

A

3-15 times

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2
Q

Maximum speed when driving with chains?

A

35 mph

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3
Q

Compression ratio of a diesel engine

A

14:1 to 25:1

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4
Q

Torque

A

A force that tends to rotate or turn things

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5
Q

How to perform an oil check in the cab

A

Push the up and down arrow buttons at the same time

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6
Q

OL - LO2

A

Oil level low by 2 quarts

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7
Q

OL - HI2

A

Oil level high by 2 quarts

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8
Q

OL - 7 0

A

Temperature too low (below 160)

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9
Q

Jake brakes will handle how much of your braking needs?

A

85%

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10
Q

Jake brake will help you stop how much faster?

A

30% less time and distance

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11
Q

What is the electrical system on most rigs?

A

12-volt

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12
Q

Why plug the rig into shore power in the station?

A

The constant need for a fully charged battery

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13
Q

What does the alternator do?

A

Provides electricity to the 12-volt system, including the batteries, compartment lights, light bar, scene lights, floor lights, etc.

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14
Q

What does the voltmeter show?

A

The amount of voltage the system is producing with the engine off or running.

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15
Q

A fully charged battery with engine off and no loads running will read what on the voltmeter?

A

12.6 volts

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16
Q

With engine running what should the voltmeter read?

A

13-14.8 volts

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17
Q

What does the ammeter show?

A

How much electricity is going to and from the batteries, in amps.

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18
Q

What does the load manager do?

A

Prevents the batteries from being excessively discharged.

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19
Q

ECU

A

Electronic Control Unit, continuously monitors the vitals of the engine and transmission.

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20
Q

What type of pump mounting is used for modern day pumpers?

A

Midship transfer drive

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21
Q

What kind of pump is used to move water through the pump?

A

Centrifugal pump

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22
Q

Describe “series” or “pressure” mode.

A

Water is sent from one impeller to the other, boosting the pressure.

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23
Q

Describe “parallel” or “volume” mode.

A

Water enters both impellers at the same time and double the volume is discharged without an additional boost in pressure.

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24
Q

Describe cavitation.

A

A condition in which vapor cavities form then implode causing a shock wave. It happens when pockets of low pressure form at the vanes in the impeller of a centrifugal pump. It causes vibrations, loss of efficiency, and damage to the impeller. It can sound like gravel or marbles in the pump.

25
Q

What is the usual cause of cavitation?

A

Inadequate supply.

26
Q

What is a priming device used for?

A

To replace air in the centrifugal pump with water.

27
Q

What does a discharge relief valve do?

A

It handles sudden changes in pressure on the discharge side of the pump by re-routing the water back to the intake side.

28
Q

What does an intake relief valve do?

A

It prevents dangerous pressures on hoses and pumps. When hose lines are shut down, intake relief valves automatically open to spill unused water on the ground preventing water hammer or dangerous pressure increases on pumps and hoses. Also called a dump valve.

29
Q

What is an intake relief valve usually pre-set to?

A

125 psi

30
Q

What does the PSG do?

A

It reduces the engine RPM (through a series of electronics) which in turn reduces the pump pressure.

31
Q

Intake gauge is also known as

A

Compound gauge

32
Q

Intake/compound gauge

A

Registers intake pressure (psi) from pressurized source or vacuum (inHg) when drafting.

33
Q

Discharge gauge

A

Registers discharge pressure on charged lines. 2 types are master (overall PDP) and individual/port (pressure for individual line).

34
Q

Static pressure

A

Pressure of the water at rest in a system

35
Q

Residual pressure

A

Pressure left in the system while water is flowing

36
Q

Flow pressure

A

Forward velocity pressure at a discharge opening while water is flowing

37
Q

Friction loss

A

Loss of pressure created by the turbulence of moving water against the wall of the hose or pipe

38
Q

Tandem pumping

A

Short relay operation (usually side by side) where one pumper discharges water to the intake of a second pumper. The second pumper then boosts the pressure even higher. Essentially two pumpers placed together to work as a two-stage pump in series mode.

39
Q

Dual pumping

A

Operation where a strong hydrant is used to supply two or more engines by connecting them intake to intake.

40
Q

Size of tank to pump piping

A

3” to 3.5”

41
Q

GPM limit when pumping from tank

A

500 GPM

42
Q

Safe minimum of your intake gauge

A

20 psi

43
Q

What is the size of the main supplying the hydrant and what does it mean?

A

At least 6”, meaning if you have a 4” or 5” hose from a steamer port of the hydrant, there is still water left from that 6” pipe.

44
Q

Theoretical Lift

A

The amount water can be raised by atmospheric pressure in a controlled environment.

45
Q

Maximum Lift

A

The height a pumper in good condition can be expected to lift water at draft. Generally 2/3 of theoretical lift.

46
Q

Dependable Lift

A

The height a column of water can be lifted while still providing a reliable fire flow. 14.7 feet at sea level.

47
Q

Source Pumper

A

The engine connected to the water supply at the beginning of the relay operation.

48
Q

Attack Pumper

A

The engine located at the fire scene that receives incoming water and discharges the water for fire attack.

49
Q

LDH

A

3.5” to 12” hose

50
Q

MDH

A

2.5” or 3” hose

51
Q

What is attack hose service tested at?

A

300 psi

52
Q

When should a relay operation be considered?

A

When more than 300 GPM is the needed fire flow.

53
Q

Standard maximum pressure for relay pumping.

A

180 psi (Pump tested at 250 psi, 50 psi safety margin, 20 psi safety residual)

54
Q

Tender/tanker

A

Apparatus designed to carry 1000-3000 gallons of water and must be able to fill and dump at a rate of 1000 GPM.

55
Q

Nurse tender

A

Large capacity tender/tanker that sits next to the attack engine and receives all the shuttle water to provide an uninterrupted water source for the attack pumper.

56
Q

Fill site layout in tender supply evolution

A

Both 2.5” ports have a hydrant gate valve, lay out and connect 2 50-foot sections of 2.5” supply hose to the gate valves and then open the hydrant.

57
Q

Modern fire apparatus use what type of priming pumps?

A

Rotary vane or rotary gear pumps

58
Q

How is the priming pump powered?

A

On older apparatus, by a small starter motor. In newer apparatus, by a multistage venturi powered by compressed air.

59
Q

What is the maximum amount of time to achieve a prime?

A

30 seconds for 1250 gpm pump, 45 seconds for 1500 gpm pump

Engineer Test (12 decks)

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