DC generators are classified according to the manner in which（）
A . they are used
B . the field windings are connected to the load
C . the armature circuit is connected to the load
D . the field windings are connected to the armature circuit
相似题目
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When two DC generators operate in parallel, they are protected against motorizing by（）
A . blow out coils
B . governor relay
C . under voltage trips
D . reverse current tri
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Which two statements or sets of statements are true about the application of the qos pre-classify command？（）
A . If the classification policy is based upon the ToS byte， the qos pre-classify command is required because the ToS byte only appears in the inner IP header.
B . The ToS byte is copied to the outer header by default. Therefore， the qos pre-classify command is not necessary.
C . With GRE encapsulation， the qos pre-classify command is applied on the tunnel interface. This practice allows for different OoS configurations on each tunnel.
D . With GRE encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface.
E . With IPsec encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface.
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Equal power factors on paralleled AC generators are maintained by an automatic （）.
A . voltage regulator
B . reverse power relay
C . reverse current relay
D . governor control switch
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Fires involving combustible metals are classified as （）.
A . class "A" fires
B . class "B" fires
C . class "C" fires
D . class "D" fire
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（）on board ship are used to control and distribute the electrical energy generated by generators.
A . A.Governors
B . B.Alternators
C . C.Blackboards
D . D.Switchboards
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The gear and screw pumps are classified as （）.
A . variable stroke pumps
B . multistage pumps
C . positive displacement pumps
D . triple-ported pum
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Fires occurring in combustible metals, such as sodium or magnesium, are classified as a （）.
A . class A
B . class B
C . class C
D . class D
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Clouds are classified according to their（）.
A . size
B . moisture content
C . altitude and how they were formed
D . location in a front
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The gear, screw, and vane pumps are all classified as （）.
A . variable stroke pumps
B . multistage pumps
C . positive displacement pumps
D . triple-ported pum
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All diesel engines are classified as（）.
A . four cycle
B . compression ignition
C . vacuum ignition
D . external combustio
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Vessel propellers are classified as being right hand or left handA right hand propeller turns clockwise when viewed from（）.
A . the bow
B . the stem
C . the port side
D . the starboard side
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The purpose of the commutator and brushes on a DC generator is to（）
A . change AC to DCcurrent
B . change DC to AC current
C . neutralize a armature reaction
D . carry current to the outside circuit
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The main generators are connected to（）.
A . distribution boards
B . section boards
C . emergency switch boards
D . main switch board
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While paralleling two AC generators using synchronizing lamps only, both lamps will go dark when the generators are （）.
A . running at the same speed
B . grounded
C . of the same polarity
D . in phase
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105. Clouds are classified according to their ______.
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Products are classified into and industrial products.
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In Beijing Opera, characters are classified according to sex
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Chinese characters are generally classified into four categories and they are pictographic characters, ideographic characters, associative characters and ____.
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Antonyms are classified on the basis of _____.
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Liabilities that are required to be paid within a year are classified as current liab
是
否
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Vowel sounds are classified by a number of factors: the position of the tongue in the
是
否
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Types of contracts are virtually classified by their______system: （1) price-based and
Types of contracts are virtually classified by their______system: (1) price-based and (2) cost-based.
A、construction
B、design
C、tender
D、payment
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Dynamic pumps are classified as centrifugal or axial. axial pumps operate on the principle of centrifugal force.（）
是
否
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Among the most popular books being written today are those which are usually classified as science fiction. Hundreds of titles are published every year and are read by all kinds of people.Furthermore,
A、Hundreds of titles are published every year.
B、All kinds of people love it.
C、Some of the most successful films of recent years have been based on science fiction stories.
D、Science fiction can be found in books written hundreds of years ago.
