[单项选择]Which of the following types of motors is often designed for use in correcting power factor?（）
A. Polyphase
B. Wound-rotor
C. Induction
D. Synchronous

[单项选择]Which of the following electric motors would be the safest and most reliable to use on the main deck of a vessel in foul weather conditions?（）
A. Sealed motors
B. Drip proof motors
C. Enclosed motors
D. Watertight motors

[单项选择]Which types of portable fire extinguishers are designed for use on electrical fires?（）
A. Dry chemical and carbon dioxide
B. Foam (stored pressure) and soda-acid
C. Carbon dioxide and foam (stored pressure)
D. Dry chemical and soda-acid

[单项选择]Which types of portable extinguisher should you watch for the reflash of the fire?（）
A. foam and water
B. CO₂ and dry chemical
C. dry chemical and water
D. foam and CO₂

[单项选择]The profit from the camage of cargo,which is often called（）,keeps the mer-chant ship running.
A. obligation
B. freight
C. contract
D. delivery

[单项选择]Which of the listed types steam traps operates on the principle that hot water flashes to steam when its vapor pressure is rapidly reduced?（）
A. Ball float
B. Thermostatic
C. Bimetallic
D. Impulse

[单项选择]Which of the following types of hydraulic pumps would be used in a steering system?（）
A. Lobe
B. Screw
C. Radial piston
D. Volute

[单项选择]Damaged bulkheads often take a permanent set which is independent of the panting or bulge caused by water pressure. To control this，you should（）.
A. install shoring so the shoring supports the damaged bulkheads without pushing on them
B. install shoring so that it pushes on the damaged bulkhead while supporting it
C. use jacks or chain falls to remove the set before installing shores
D. place sandbags by the bulkhead without installing shores

[单项选择]Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）
A. Electric
B. Hydraulic
C. Air
D. All of the above

[单项选择]Two types of anchor shackles which are currently available are（）.
A. U-Type and posilok shackles
B. C-Type and wedge shackles
C. D-Type and bow shackles
D. wedge and kenter shackles

[单项选择]Which of the listed bearing types is an example of a solid bearing?（）
A. Piston wrist pin bushing
B. turbine bearing
C. Spring bearing
D. Diesel engine main bearing

[单项选择]Which of the listed types of files is the best for producing a fine finish on metal?（）
A. Mill
B. Float
C. Warding
D. Second cut

[单项选择]Which of the devices listed is common to all types of pumps?（）
A. A power end and fluid end
B. A propeller and educator
C. A volute and impeller
D. A turbine and piston

[单项选择]Which types of prefixes will a router running BGP most likely advertise to an IBGP peer， assuming it is not configured as a route reflector？ （）
A.  prefixes received from any other BGP peer and prefixes locally originated via network statements or redistributed
B.  all prefixes in its routing table
C.  prefixes received from EBGP peers and prefixes locally originated via network statements or redistributed
D.  prefixes received from EBGP peers and prefixes received from route reflectors
E.  prefixes received from other IBGP peers， prefixes received from EBGP peers， and prefixes redistributed to BGP
F.  prefixes received from other IBGP peers and prefixes received from route reflectors

[单项选择]Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
A. absence of engine log book
B. serious corrosion on the hull
C. one page missing in the oil record book
D. paint peeling off some tailings in engine rooms