更多"The internal force of a material, w"的相关试题:
[单项选择]The force exerted by a propeller which tends to throw the stern right or left is called（）.
A. slip
B. sidewise force
C. rotational force
D. thrust
[单项选择]A substance found in residual fuels which tends to cause exhaust valve corrosion and grooving, is（）
A. carbon
B. vanadium
C. calcium
D. hydrogen
[单项选择]Sidewise force of the propeller tends to throw a vessel’s stern to the right or left，depending on rotation. This force is caused by（）.
A. back current from the rudder
B. greater pressure on the right or left side of the propeller，depending on rotation
C. lower pressure on the right or left side of the propeller，depending on rotation
D. torque from the velocity and angle at which the surrounding water impinges upon the propeller blades
[单项选择]Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?（）
A. Baffle plates that have been bent during prior removal
B. Leaks in the cooler tube nest
C. Operating the engine while maintaining a high sea water outlet temperature
D. A punctured sea water strainer supplying cooling water to the heat exchanger
[单项选择]By which of the following means is force efficiently provided to vary the pitch of the blades on a modem controllable pitch propeller?（）
A. Hydraulic
B. Mechanical
C. Pneumatic
D. Electrical
[单项选择]The force acting on a single cargo runner which is vertically lifting or lowering a load is greatest when（）.
A. decelerating when lowering the load
B. decelerating when raising the load
C. lowering the load at constant speed
D. raising the load at constant speed
[单项选择]Basically the bedplate consists of two （）, which run the length of the engine.
A. longitudinal girders
B. transverse girders
C. fore girders
D. aft girders
[判断题]General linguistics, which relates itself to the research of other areas, studies the basic concepts, theories, descriptions, models and methods applicable in any linguistic study.
[单项选择]Which of the following statements represents the reason for rolling over a diesel engine with the cylinder indicator cocks open prior?（）
A. To test the starting system
B. To remove air bubbles from the jacket water
C. To ensure that the lube oil system delivers pressure
D. To ensure foreign material (water etc) is not present in the cylinders
[单项选择]Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）
A. Carbon particles
B. Lube oil
C. Gasoline
D. Diesel fuel
[单项选择]Which of the following statements concerning the rigging of bosuns’ chairs and their use is TRUE（）.
A. Always secure the gantline to the chair with a bowline
B. Always have the chair hoisted with at least three turns on a winch drum
C. Any tools，paint pots etc．should be secured by lanyards
D. When riding a stay，make sure that the bow of the shackle passes through the becket of the bridle
[单项选择]Which emergency is required to be covered at the required periodic drills on a fishing vessel?（）
A. Recovering an individual from the water
B. Steering casualty
C. Emergency towing
D. Loss of propulsion power
[单项选择]Which of the following should be recorded in Oil Record Book Part I (machinery space operation) ?（）
A. Non automatic discharge overboard of machinery space bilge water
B. Automatic discharge overboard of machinery space bilge water
C. A and B
D. Neither A nor B
[单项选择]Which of the following conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?（）
A. Injection pressures
B. Control air supply pressure
C. Cooling water flow through after-coolers
D. Lube oil temperature
[单项选择]Which vessel when anchored at night，would not be required to show anchor lights? （）
A. A vessel engaged in underwater operations
B. A vessel engaged in mine clearance
C. A vessel engaged on pilotage duty
D. A vessel engaged in survey operations
[单项选择]Every lifeboat which is fitted with a fixed（）VHF radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
A. one-way
B. two-way
C. double-effect
D. one-effect
[单项选择]Gasoline vapor tends to collect（）.
A. above the floor plates of the bilges
B. above the carburetor level
C. at the lowest point of the bilge areas
D. at no particular level
[单项选择]Air that may enter a refrigeration plant tends to collect in the （）.
A. upper part of the receiver
B. upper part of the condenser
C. down stream end of the cooling coil
D. outlet end of the condenser
