Class 2 CC Explosion

What are the components of fire triangle?

• Heat

• Air

• Fuel

• All are correct

SOLAS regulations to prevent crankcase explosions came into place after a particularly devastative explosion that claimed the lives of 28 people onboard ____

• MV Herald Enterprise

• MV Reena Dal Pacin

• MT Rina Disaster

• MV Reina Del Pacifico

What is the flash point of main engine crankcase lubricating oil?

• -188 deg C

• 60 deg C

• 220 K

• 220 deg C

SOLAS regulations to prevent crankcase explosions came into place in ____

• 1964

• 1947

• 1974

• 1800

Crankcase relief door also prevents the exit of flame outside of engine by using a ____

• non-return valve

• flame arrester

• return valve

• water spray

Generally, OMD alarm will operate when it reaches a oil mist concentration of ____.

• 25-50% LEL

• 2.5-5% HEL

• 100% LEL

• 2.5-5% LEL

When oil mist alarm is received, it is required to wait for minimum ____ before opening the crankcase doors.

• 30 hours

• 30 seconds

• 30 minutes

• All are correct

Crankcase relief valve should open fully at a pressure of ____.

• not greater than 0.02 Mpa

• not lesser than 0.2 bar

• not greater than 2 bar

• not lesser than 2 bar

Additional relief valves are to be fitted for separate spaces on the crankcase, such as gear or chaincases for camshaft or similar drives, when the gross volume of such spaces exceeds ___

• 6 m3

• 0.6 m3

• 0.06 m3

• 16 m3

1. For engines of 2250 kW and above or having cylinders of more than ____ bore, oil mist detector or bearing temperature monitor is required.

• 500 m

• 600 mm

• 500 mm

• 300 mm