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Engine Category > EM10-Diagnose and Correct Equipment Malfunctions

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Videotel questions are grouped by professional topic, including machinery, electrical equipment, fuel and ballast operations. Choose a subject relevant to your preparation.

“Видеотел — Engine Category > EM10-Diagnose and Correct Equipment Malfunctions” contains 10 questions across 1 collection.

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You will notice in this drawing that steam traps are fitted so only condensate can return. Then why is there an atmospheric condenser fitted ?

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  • 1) Because the water is condensed under pressure and will re- evaporate.✓ Correct answer
  • 2) To allow the vapour and water to be cooled under vacuum.
  • 3) To de-airate the water under vacuum.
  • 4) To avoid steaming up if steam traps are frequently stuck or defective.
The use of a steam trap has a beneficial influence on the thermal balance of the heat exchanger fitted before that trap. This is because .....

One correct answer

Question illustration
  • 1) it will allow the steam to expand to atmospheric pressure.
  • 2) all heat is used under corresponding saturated pressure.
  • 3) all heat will be extracted from the steam before turning to water.✓ Correct answer
  • 4) it will allow the steam to expand below atmosphere to vacuum.
What is item "U" and how does it act on item "S" ?

One correct answer

Question illustration
  • 1) Item "U" is the uplifter of the air bottle's safety valve.
  • 2) Item "U" is the upper pressure limit valve activating the solenoid.
  • 3) Item "U" is the unloader lifting the compressor suction valve.✓ Correct answer
  • 4) Item "U" is the activator for the safety release valve.
In the operation shown what is being checked?

One correct answer

Question illustration
  • 1) Axial position of the compressor impeller.
  • 2) Turbine wheel/nozzle clearance.✓ Correct answer
  • 3) Axial location of the labrynth gland.
  • 4) Axial movement in the thrust bearings.
When taking a set of crankshaft deflections the + sign is indicated, example +4. This means that .....

One correct answer

Question illustration
  • 1) the crankpin location is 4/100 mm out of centre.
  • 2) the crankwebs have opened up by 4/100 mm.✓ Correct answer
  • 3) the crankwebs have closed in by 4/100 mm.
  • 4) one main bearing on one side is 4/100 mm bigger than the other.

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