500 An "instantaneous-trip" type fuse will __________.
A. open as soon as the loa…
Topic: electrical
499 Loss of residual magnetism in an alternator or generator can be corrected for by __________.
A. running the rotor in the opposi…
498 The frequency of an alternator is controlled from the main switchboard by adjusting the __________.
A. frequency meter�����������������…
496 A megohmmeter is connected to each end of an individual motor winding. A low ohm reading indicates __________.
A. an open coil��������������������…
495 An important factor in reducing D.C. motor commutator wear is __________.
A. keeping the ambient humidity as…
494 In the construction of D.C. motors, parts of both the series and shunt fields are wound on the __________.
A. opposite main pole��������������…
493 Nickel-cadmium storage batteries are superior to lead- acid batteries because they __________.
A. put out higher voltages and requi…
492 Which of the following statements represents the correct method of connecting the shunt of an ammeter prior to taking a reading?
A. In series with the load and in s…
490 Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?
A. The generator and bus transfer se…
489 The speed of a multi-speed, squirrel-cage, induction motor operating in a fixed frequency system can be changed by __________.
A. reconnecting stator windings for diffe…
488 Routine maintenance of a ship's service alternator should include __________.
A. changing the pedestal bearing …
487 Which of the following statements about copper wire sized by the AWG rating is correct?
A. Number 12 AWG wire has a highe…
485 Due to the operating characteristics of the system, time lag fuses (or dual-element fuses) are necessary for use in __________.
A. main lighting circuits���������…
484 Relative to the direction of rotation, a D.C. motor commutating pole has the same polarity as the __________.
A. main pole following������������…
483 When mixing electrolyte, which of the following precautions should always be observed?
A. Add the acid to the water.����������…
482 The plates of a wet cell NiCad storage battery are made of __________.
A. potassium hydroxide with a small…
481 An accidental path of low resistance which passes an abnormal amount of current is known as a/an __________.
A. polarized ground����������������…