单项选择题To equalize the power factor of two alternators operating in parallel, the ()

A.field excitation of both units is adjusted
B.governors of both units are adjusted
C.phase sequence is altered
D.kilowatt load is evenly divided


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1.单项选择题An advantage of DC motors over AC motors is that they ()

A.are less expensive
B.require less maintenance
C.can be started across the line
D.offer a more effective means of controlling speed

2.单项选择题Which of the following devices are protected from being motorized by a reverse-power relay?()

A.Alternators
B.Wave guides
C.Exciters
D.Amplidynes

4.单项选择题AC and DC generators are similar in that they ()

A.both generate alternating voltages
B.both rectify the voltage before delivery
C.are constructed at the same physical size for the same kilowatt rating
D.both supply three-phase power

5.单项选择题To increase the frequency of an operating AC generator, you should ()

A.increase the field excitation
B.decrease the field excitation
C.increase the number of magnetic poles
D.increase the speed of the prime mover

6.单项选择题When measuring AC current flow, you must always connect the meter ()

A.in series with the power source and load
B.in parallel with the power source and load
C.insuring correct polarity
D.using the lowest range possible to prevent instrument damage

7.单项选择题The frequency of an AC generator is adjusted by means of the ()

A.main alternator field rheostat
B.exciter field rheostat
C.prime mover governor control
D.equalizing reactor

8.单项选择题When the current flow through a copper wire increases, its ()

A.resistance will decrease
B.insulation will bum
C.temperature will increase
D.conductivity will increase

9.单项选择题When securing an AC generator, you should FIRST ().

A.open the generator circuit breaker
B.switch the voltage regulator to “manual”
C.decrease the field excitation to minimum
D.reduce the load on the unit

10.单项选择题Prior to starting an AC generator prime mover, the voltage regulator cutout switch should be placed in the ()

A.manual position
B.bus neutral position
C.raise voltage position
D.transfer position