Auxiliary Machinery. Test 51

What is the most common reason for malfunctioning or erratic functioning of a pneumatic nozzle/flapper assembly ?

The flapper is broken or distorted.
Oil or moisture in the back pressure line (NBP).
The nozzle is worn out.
Dirty air passages of restrictor and nozzle.

What maintenance is required for an 'Auto-Kleen' knife type filter?

Remove element and renew.
Remove element and hand clean.
Periodically remove sludge from the filter base.
Back flush the filter.

For a low pressure boiler, testing shows the water chloride level to be 1000 PPM. What action would you take ?

Increase chemical dosage.
Blow down boiler and check condenser for leakage.
No action needed.
Decrease chemical dosage.

What is the ideal temperature to maintain the diesel oil daily tank and how is this achieved ?

45 degree C, by circulating the fuel with the purifier tank.
45 degree C, by application of steam heating.
65 degree C, by application of steam heating.
65 degree C, by circulating the fuel with the purifier tank.

Why is the stern tube header tank fitted above the sea water level ?

To avoid oil being spilled overboard.
To ensure lubrication of the after stern tube seal.
To avoid sea water entering the stern tube.
To ensure lubrication of the forward stern tube seal.

The plate heat exchanger is separated for cleaning, what should you do if the plates are thick with scale or other organic material ?

Use a high pressure cleaner with abrasives.
Put the plates in water with cleaning chemicals. Use soft a brush or high pressure cleaner with care.
Change the plates.
Use a wire-brush or metal scraper to clean the plates.

This characteristic shows that only linear part a-b can be used. This means that the normal effective travel of the flapper is only _____ for the full measuring range.

0.01 mm.
0.005 mm.
0.10 mm.
0.05 mm.

In this nozzle/flapper assembly (part of a pneumatic control system) at what distance away from the nozzle does the flapper need to be moved in order not to have any influence on the NBP (nozzle back pressure) ?

h = 0.4 D.
h = D.
h = 0.25 D.
h = 0.5 D.

Review Answers

Auxiliary Machinery. Test 51

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