15. Which possible reason will not make centrifugal pumps to vibrate?
(A) Bent shaft
(B) The impeller has become partially clogged so that the balance
is disturbed
(C) Worn bearing
(D) Complete impeller
16. There are two instruction manuals on the desk . One is for main
air compressor, and ___________ is for L.O. purifier.
(A) another
(B) the other
(C) other
(D) an other
18. Mr. P.A Chang, __________________ representative, conduct a
fire drill carried out by the crew assigned to there duties on the
muster list.
(A) the Community Administration's
(B) the Flag State Administration's
(C) the Nationality Administration's
(D) the Government Administration's
19. 發現 二號主冷卻海水泵馬達電樞線圈燒毀 A burnt ______ windings of
electric motor of No.2 main cooling sea water pump was discovered.
(A) circuit
(B) rotor
(C) armature
(D) pole
20. The valve has a bulbous body, housing a valve seat and screw down
plug or disc arrange at right angles to the axis of the pipe. What
kind of valves is above description?
(A) Gate valve
(B) Globe valve
(C) Butterfly valve
(D) Check valve
30. The type of unit can be found that their widest application for
dealing with large volumes with medium-to-low heads and viscosities,
and the condenser circulating pump be an ideal example.
(A) Gear pumps
(B) Reciprocating pumps
(C) Screw pumps
(D) Centrifugal pumps