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AOTM Paul > Priming, Booster Pumps and Instruments > Flashcards

Priming, Booster Pumps and Instruments Flashcards

1
Q

What is required to prime a centrifugal pump?

A

A positive displacement pump

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2
Q

What is the theory of positive displacement?

A

That water is no compressible and will occupy an area directly proportional to the quantity

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3
Q

What is slip when referring to a pump?

A

Slip is the term covering the leakage between the internal parts of the pump

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4
Q

What determines slippage?

A

Slippage is dependent on the condition of the pump and the operating pressure.

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5
Q

What is a good indication that the main pump is primed?

A

A good solid stream issuing from the priming pump discharge.

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6
Q

A prime is maintained by what?

A

The rotation of the centrifugal pumps impeller

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7
Q

Pumps shall not be operated dry for a period exceeding how many seconds?

A

30

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8
Q

When drafting, all lines must be attached and the pump primed PRIOR TO or AFTER placing the pump in gear?

A

Prior to

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9
Q

What can be done if an air lock occurs in the pump?

A

Open a discharge gate or prime the pump.

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10
Q

How many types of pressure gauges are there?

A

Three: vacuum, pressure and compound

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11
Q

Vacuum gauges are measured in what?

A

Inches of mercury

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12
Q

What does the zero reference point reference on a compound gauge?

A

Atmospheric pressure

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13
Q

All centrifugal pumps use what kind of gauges on suction side to measure incoming pressure?

A

Compound gauges

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14
Q

All gauges are of what type?

A

Bourdon

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15
Q

On a gauge, what is attached to the pinion shaft that holds the assembly together tightly and dampens movement of the pointer?

A

Hairspring

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16
Q

What type of gauges are oil gauges?

A

Mechanical or electrical

17
Q

What does a mechanical gauge consist of?

A

Consists of a bourdon type with a pointer attached. Psi is interdicted by a small tubing system connected to the engine oil system

18
Q

What does an electrical gauge consist of?

A

A sending unit mounted on the engine and connected to a panel mounted receiving unit by means of a wire.

19
Q

It is possible that a lower oil psi be recorded if engine speed is less than how many rpm?

A

1000 rpm

20
Q

What do rapid undulations of pointer usually caused by?

A

Low oil level

21
Q

What is an ammeter?

A

Indicates battery condition

22
Q

A defective alternator, generator or voltage regulator is indicated when charging rate is….?

A

Low or discharging

23
Q

Where should the pointer go on ammeter when engine is stopped?

A

Back to zero

24
Q

If engine is stopped but ammeter is showing a discharge, what does this warn of?

A

That electrical equipment was left on and a short exists.

25
Q

What is the tachometer and indication of?

A

It indicates the speed of the engine crankshaft in rpms

26
Q

Why is a tachometer checked during pumping operations?

A

To determine if there is reserve power and if the pump is operating correctly

27
Q

An auto relief valve opens the bypass between what sides of the pump?

A

The suction and the discharge sides of the pump

28
Q

A relief valve keeps both pump and engine under a constant…..

A

Load

29
Q

What is the max setting for the relief valve?

A

300 psi

30
Q

How should relief valve normally be carried?

A

In off position and control handle set to a psi slightly higher than expected.

31
Q

How is the lower draincock kept on relief valve?

A

In closed position

32
Q

What happens when the auxiliary cooler valve is opened?

A

Water from the pressure side of the pump is circulated through the cooler around tubes, then water returns to the suction side of the pump

33
Q

What if there are no pump transmission cooling gauges?

A

Place transmission cooling system into operation if the pump transmission is hot to hand.

AOTM Paul (1 decks)

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