單項(xiàng)選擇題In （） the control action is independent on(of) the output.

A.a closed loop control system
B.an open loop control system
C.a boiler control system
D.a steering gear control system


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1.單項(xiàng)選擇題This arrangement is （） if the elements are directly connected to one another and the control action takes place without human involvement.

A.a manual closed loop
B.a manual opened loop
C.an automatic closed loop
D.an automatic opened loop

2.單項(xiàng)選擇題Bourdon Tube is probably the most commonly used （） measuring instrument.

A.the absolute pressure
B.the gauge pressure
C.the vacuum pressure
D.the differential pressure

4.單項(xiàng)選擇題When two different metals are joined to form a closed circuit and exposed to different temperatures at their junctions （） which can be used to measure temperature.

A.a current will flow
B.a power will develop
C.a heat will flow
D.a pressure will produce

5.單項(xiàng)選擇題（） is provided to alternators, in the event of prime mover failure to ensure that the alternator does not act as a motor.

A.Reverse current protection
B.Reverse power protection
C.Synchronising device
D.Frequency meter