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Flashcards in Engineer Resource Manual Deck (59)
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1

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

3-15 times

2

Maximum speed when driving with chains?

35 mph

3

Compression ratio of a diesel engine

14:1 to 25:1

4

Torque

A force that tends to rotate or turn things

5

How to perform an oil check in the cab

Push the up and down arrow buttons at the same time

6

OL - LO2

Oil level low by 2 quarts

7

OL - HI2

Oil level high by 2 quarts

8

OL - 7 0

Temperature too low (below 160)

9

Jake brakes will handle how much of your braking needs?

85%

10

Jake brake will help you stop how much faster?

30% less time and distance

11

What is the electrical system on most rigs?

12-volt

12

Why plug the rig into shore power in the station?

The constant need for a fully charged battery

13

What does the alternator do?

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

14

What does the voltmeter show?

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

15

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

12.6 volts

16

With engine running what should the voltmeter read?

13-14.8 volts

17

What does the ammeter show?

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

18

What does the load manager do?

Prevents the batteries from being excessively discharged.

19

ECU

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

20

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

Midship transfer drive

21

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

Centrifugal pump

22

Describe "series" or "pressure" mode.

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

23

Describe "parallel" or "volume" mode.

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

24

Describe cavitation.

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

What is the usual cause of cavitation?

Inadequate supply.

26

What is a priming device used for?

To replace air in the centrifugal pump with water.

27

What does a discharge relief valve do?

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

28

What does an intake relief valve do?

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

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

125 psi

30

What does the PSG do?

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