單項(xiàng)選擇題In the navigation（） cause the shafting over load easily.

A.the stopping engine suddenly
B.the sailing astern and changing direction suddenly
C.the sailing from the shallow water area to the deep water area
D.the ship’s trim too much


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1.單項(xiàng)選擇題When the vessel on the full speed ahead, if full astern immediately （） the main engine start astern and fuel injection.

A.after the thrust power is zero
B.after the torsion is zero
C.surpass the critical point on the water turbo phase
D.after the speed is zero

2.單項(xiàng)選擇題According to the Robinson Graph, suddenly astern maneuvering of main engine during navigating will cause（）

A.rapid reduction of ship’s friction force
B.shaft system over mechanical load
C.sharp growth of the torque of diesel engine
D.propeller torque change along J=0 curve

3.單項(xiàng)選擇題While a ship with twin screw is making a turn, in order to prevent overload, the duty engineer should （）

A.reduce the fuel feeding of main engine of inner propeller
B.reduce the fuel feeding of main engine of outer propeller
C.firstly reduce the fuel of main engine of inner propeller, then reduce the fuel feeding of engine of outer propeller
D.reduce fuel feeding of two engines at the same time

4.單項(xiàng)選擇題If anything abnormal be found on the load change of main engine when the ship is entering in shallow waterway, before taking measuring the engineer on duty should （）

A.stop main engine immediately
B.ask the captain and the chief engineer’s permission for stopping the engine
C.initiatively inquire the bridge for the situation
D.stop engine and inform bridge