VD-C10

Question 1

What does pump cavitation sound like

Answer 1

Sounds like gravel circulating through the pump

Question 2

What do you do if your pump is cavitating

Answer 2

Reduced engine RPM or partially closed discharge gate

Question 3

What type of gauge must be on the inlet

Answer 3

A compound gauge to read vacuum

Question 4

What portion of the pump move the water and increases the pressure

Answer 4

The impeller

Question 5

How do you correct an overheating pump

Answer 5

Partially open the tank fill valve or partially open a real line or partially open a drain valve from a discharge

Question 6

What is overspeed

Answer 6

Running an engine faster than 90% of its peak

Question 7

What is the priming pump

Answer 7

An auxiliary pump to create vacuum to prime the main pump it is a rotary vein type driven by an electric motor

Question 8

What is a relief valve what pressures does it operate in

Answer 8

An automatic safety valve and pressure regulator with Settings between 75 PSI and 300 psi

Question 9

What is the recommended time to close a discharge to prevent water hammer

Answer 9

3 to 10 seconds

Question 10

What’s the max time you can crank a starter

Answer 10

Do not crank longer than 30 seconds wait two minutes before reattempted to start

Question 11

What are the normal temperature ranges for coolant

Answer 11

160 to 195 is normal max temperature of 210 is not to be exceeded

Question 12

What pressure must the air compressor maintain to operate a vehicle after an air loss

Answer 12

40 psi any lower and the spring brake will lock

Question 13

What is pumped cavitation

Answer 13

A condition in a centrifugal pump when output exceeds input

Question 14

Telma retarders are required on emergency vehicles With what gross vehicle weight

Answer 14

24,000 pounds gross vehicle weight

Question 15

How much of the breaking can the Telma retarder handle

Answer 15

80 to 90%

Question 16

What is the best position for the Telma on downhill driving

Answer 16

Position to to obtain the best endurance

Question 17

If the Telma retarder is overheated what do you not do

Answer 17

Never attempt to cool the Telma using water warping of rotor can occur

Question 18

How does the Telma interact with an ABS system

Answer 18

Telma is deactivated when brake is activated and ABS used

Question 19

How long should a diesel engine be idol before shutting it down

Answer 19

3 to 5 minutes on idle to cool the engine

Question 20

What do you do for long periods of idle

Answer 20

Long periods of idle is not beneficial to engine wear bringing RPMs to 1000

Question 21

Length of time you can run the priming pump

Answer 21

30 seconds on a 1000 GPM pump or 45 seconds on a 1500 GPM pump under no circumstances should priming continue for one minute uninterrupted

Question 22

Pumping in the standby positions reduce pressure to what

Answer 22

Below 50 psi