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单项选择题

The power factor of an AC generator operating singularly is determined by the_______ .
A.connected load
B.prime mover speed
C.field excitation
D.generator's rated voltage

A.A.connected
B.prime
C.field
D.generator's
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When you are making a high potential test on a piece of repaired electrical machinery, a rise in leakage current indicates _______.
A.good insulation
B.bad insulation
C.high insulation power factor
D.a high slot discharge factor
A.A.good
B.bad
C.high
D.a
单项选择题
For _______the power is supplied by main switchboard directly not through sub-board
A.saving network cost
B.improving the reliability of supplying power to important load
C.preventing sequence reversing
D.increasing the power Factor of important load
A.saving
B.improving
C.preventing
D.increasing
单项选择题
The emergency generator or emergency battery is connected to _______on most large ships.
A.distribution boards
B.section boards
C.emergency switch boards
D.main switch boards
A.A.distribution
B.section
C.emergency
D.main
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