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I.  Choose the most appropriate answer from the choices given below: -   (15 Marks) 

1. Reciprocating air compressor bearing failure may result from

a) A misaligned crankshaft b) Over tightened drive belts

c) Contaminated sump oil d) All of the above

2. Salinity of distillate from fresh water generator is permitted to

a) Below 4 ppm b) 4 to ppm c) to ! ppm d) " ppm

  #$ %he flow pattern of most practical heat e&changers are

a) 'ara flow b) Contra flow c) A mi&ture of both  4$ (n an air compressor *ol$ efficiency always refer to+++++++++$

a) ,ow pressure piston b) -' piston c) Average of both

.$ /rive to the purifier bowl is via a centrifugal clutch arrangement toa)$ reduce the start up time$ b)$ to control the li0uid flow rate

c)$ to protect the motor$

  $ (n the event of main steering gear failure the au&$ steering gear must be capable of bringing to operati

speedily$ Au&$ Steering be able to put the rudder from 1.2 on one side to 1.2 on the other in$$

a) 3!$ secs$ b) #.$ secs$ c) $ secs$

5$ ,owering of the life boat is effected bya) 6lame proof electric motor b) gravity c) hand cranking

!$ (n an oil tanker '* *alves fitted to safeguard the cargo tanks are set to operate at

a)$ $14$ bar b) $3 bar c) $3. bar "$ 6ollow up gear of an electro hydraulic steering gear 

a)$ Relieves e&cess fluid pressure b)$%akes the pump off strike when the desired rudder angle is attain

c)$ Synchroni7es wheel position with rudder position

1$ Air compressor clearance volume is about +++$of swept volumea)$ $8 b)$ 8 c)$ 18

() State whether the statements are r!e or "alse 915 Marks)

1$ (t is important that the compressor clearance volume is kept as large as possible in order to improveoverall volumetric efficiency$ %rue: 6alse

3$ %he strength of the ;Bitter

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4$

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#$ /rive to the purifier bowl is via a centrifugal clutch arrangement to

reduce the start up time$ %RD< : 6A,S<

4$

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1) 6or low speed vessels the biggest component of propulsive power is used in overcoming

1) frictional resistance 3) wind resistance #) wave resistance