單項(xiàng)選擇題

Universal motors will operate on AC or DC current, and are generally found in （）

A.portable tools
B.large pump motors
C.turbo electric main motors
D.forced draft fans

你可能感興趣的試題

An operational amplifier, as used in todays consoles, has a calculated gain of 5This means that when the input changes （）

A.5 volts, the output changes 10 volts
B.10 volts, the output changes 5 volts
C.2 volts, the output changes 10 volts
D.10 volts, the output changes 2 volts

單項(xiàng)選擇題

Electrical failures in motors are caused by the breakdown of insulation, which may be caused by （）

A.penetration of moisture
B.accumulation of dirt
C.overheating
D.All of the above

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Universal motors will operate on AC or DC current, and are generally found in （）

你可能感興趣的試題

An operational amplifier, as used in todays consoles, has a calculated gain of 5This means that when the input changes （）

Electrical failures in motors are caused by the breakdown of insulation, which may be caused by （）