A.Contactors control current and relays control voltage
B.A relay is series connected and a contactor is parallel connected
C.Contactors can handle heavier loads than relays
D.Contactors are made from silver and relays are made from copper
您可能感興趣的試卷
你可能感興趣的試題
A.short proof
B.ground proof
C.explosion proof
D.overload proof
A.AC
B.DC
C.generator
D.fresh water generator
A.AC voltage to the armature
B.AC voltage to the field
C.DC voltage to the armature
D.DC voltage to the field
A.wash it with fresh water and apply an external source of heat
B.renew the windings
C.send it ashore to an approved service facility
D.rinse all electrical parts with a carbon tetrachloride cleaning solvent and then blow dry the motor with compressed air
A.the recommended current and voltage rating
B.higher current and voltage rating
C.higher current and lower voltage rating
D.lower current and higher voltage rating
最新試題
Flame failure in an automatically fired auxiliary boiler can from a/an ()
Diesel engine air start system check valves are opened by ()
To shut down a diesel engine after it exceeds the set maximum speed,which type of device listed should be used?()
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?()
The main purpose of port State control is not to()
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated()
By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a()
Using a file without a handle may result in ()
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is()
Engine parameters shall be corresponded to NOx Technical Files. This is required by ()