單項(xiàng)選擇題Which of the motors for the devices listed below is fitted with an instantaneous overload relay?（）
A.Fan
B.Pump
C.Winch
D.Machine tool
您可能感興趣的試卷
你可能感興趣的試題
1.單項(xiàng)選擇題One factor that determines the frequency of an alternator is the（）.
A.number of turns of wire in the armature coil
B.number of magnetic poles
C.strength of the magnets used
D.output voltage
2.單項(xiàng)選擇題The device that most commonly utilizes the principle of electromagnetic induction is the（）.
A.diode
B.transformer
C.transistor
D.rheostat
最新試題
The cetane rating of diesel fuel is an indication of the （）
題型：?jiǎn)雾?xiàng)選擇題
Which of the following items don’t belong to dock repair works?（）
題型：?jiǎn)雾?xiàng)選擇題
The condensers located in various stages of a flash evaporator are cooled by（）
題型：?jiǎn)雾?xiàng)選擇題
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
題型：?jiǎn)雾?xiàng)選擇題
Using a file without a handle may result in （）
題型：?jiǎn)雾?xiàng)選擇題