單項(xiàng)選擇題

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 section
B.The 450 volt, 60 cycle, 3 phase bus
C.The 120 volt, 3 phase, 60 cycle bus
D.The 24 volt DC bus

你可能感興趣的試題

單項(xiàng)選擇題

When the current in a power transmission line is increased, the power loss （）

A.increases as the square of the current
B.decreases as the square root of the current
C.remains the same, as it is independent of current flow
D.increases in direct proportion as the current

單項(xiàng)選擇題

An operational amplifier, as used in todays consoles, may have a calculated gain of 5√This means that as the input changes by （）

A.1 volt, the output changes 5 volts
B.5 volts, the output changes 1 volt
C.5 volts, the output changes 10 volts
D.10 volts, the output changes 5 volts

无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?（）

你可能感興趣的試題

When the current in a power transmission line is increased, the power loss （）

An operational amplifier, as used in todays consoles, may have a calculated gain of 5√This means that as the input changes by （）