Auxiliary Machinery. Test 51

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.

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

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.
Use a wire-brush or metal scraper to clean the plates.
Change the plates.

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

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

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

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

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.
45 degree C, by circulating the fuel with the purifier tank.

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

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

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

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

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

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

Review Answers

Auxiliary Machinery. Test 51

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