GMA Candidate (Paisley) examiner 18/03/2020
Difference between star delta and direct on line.
Where would you find star delta?
What other starting methods? (I stupidly said soft starting)
Explain how a soft starter works?
Why direct line not suitable?
Which one would companies prefer to have? And why?
What safeties on motors?
How does bimetallic strip work
How does a fuse work.
What’s high rupture capacity fuses
What’s different between slow burning and fast acting fuses
If what would you do if one was blown.
What construction of fuses
Other safeties
What faults in motors
Start air system explain safeties
Why slow turn valve
Would indicators valves be shut or closed
Bursting disk ruptured during manoeuvre what are your actions? (Rotate cap to reduce air loss)
Why did it rupture?
What causes over pressure?
What’s most common cause ? (Leaking valve)
How does start air explosions happen.
How to check fuel pump timing
How to check exhaust valve opening timing (didn’t know answer, I suggested pressure gauge or disconnect oil line and see when oil starts to come out)
Valve burn out causes?( Gave home loads, even spoke about hot corrosion 3:1 vanadium sodium. In the end he wanted tappet clearance 😂)
Then asked what would happen if clearances were set too large, too small?
Boilers
How to set safety valve on boiler in presence of surveyor.
He also asked if I had any knowledge on thermal oil boilers, I said no, and asked him what they were. He explained a bit and how to test them.
He asked as 2nd engineer how to take a walk around your engine room and how would I inspect it with regards to safety.
Then the magic words
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