ORAL
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2ND MATE EXAM ORAL QUESTIONS AND ANSWERS - LATEST QUESTIONS | Page 90
Q. 891) Ur vessel is in TSS , CBD , you see a pd vessel on your port bow , take action
X
cbd means her draft is restricted by the available depth and width of the nav. water.she cant alter the co she is following. so, reduce speed,call the other vsl on vhf,inform master,inform vts
Rule no:18 says clearly that it does not apply in TSS,NARROW CHANNEL,OVER TAKING.I'll alert him with 5 rapid and short blast and if further Risk of collision exist I'll take action as per Rule 2&8
Q. 892) What is IMDG classifications ? what is 6(i) ? what is symbol for class 7
XQ. 893) Explain sewage treatment plant and values ?
X
type approved by admin.
test results laid n ispp cert.
shal nt produce visible float nor discoloration of surrounding water.
Q. 894) What is wig craft , what is surface effect action
X
Principle
A wing generates lift, in part, due to the difference in air pressure gradients on the wing surfaces: both upper and lower. During normal flight, the upper wing surface experiences reduced static air pressure and the lower surface comparatively higher static pressure. In normal flight, these air pressure differences also accelerate the mass of air downwards balancing momentum. However kinetic energy is proportional to the square of the velocity so designers aim to minimize the accelerated air velocities to reduce wasted energy in both the downward mass acceleration and wingtip vortices. Flying close to a surface increases air pressure on the lower wing surface (the ram or cushion effect) and decreases air acceleration so the ground effect improves the aircraft lift to drag ratios in two ways. Momentum is still balanced because the air pressure beneath the wing is pressing on the underlying surface—the water or flat land.
Q. 896) Marpol annex 4 and 5
XAnnex IV Regulations for the Prevention of Pollution by Sewage from Ships
Annex V Regulations for the Prevention of Pollution by Garbage from Ships
Q. 897) Quote rule 19 , rule 37 and annex 4
X
1> a gun or other explosive fired
2>a cont sounding of fog signal
3>rockets or shells
4> n.c. flag
5>mayday
6> sos
7> ball, square ,ball
8> flames, smoke signal, raising lowering of arms
Q. 898) What is squat ? how will you reduce effect of squat ?
XThe Change in ships trim when being at motion or being stationary is called squat. The Squat is mainly experienced over in shallow waters it increases with square of the speed of the ship in order to reduce squat ship speed has to be reduced squat is calculated by the formulae
squat= V(square)/100*Cb
Squat is a bodily sinkage of a ship due to its movement through the water and is depend on speed, ship form, and the underwater clearance.
The overall decrease in the underkeel clearance fwd. and aft is called squat.
TO ELIMINATE SQUAT;
reduce speed,
Sufficiant UKC is to be kept to avoid SQUAT.
Q. 899) What is cargo securing manual ? contents , diff b / w cargo securingmanual and lashing manual ?
XQ. 900) What is raster charts , vectors charts , which is better and why
XVector charts are more advantageous than raster chart because vector chart enables user to select many alarms, such as depth alarms, various modes such as head up and north up, Zooming facility, Add or remove the data required.
as it is in vector charts info stored in layers so u can select the reqd info which v cant do on vecor charts .
