更多"The distance traveled by the center"的相关试题:
[单项选择]
A crankshaft whose center of gravity coincides with its center line is said to be（）
Ⅰ.statically balanced
Ⅱ.dynamically balanced
A. Ⅰ only
B. Ⅱ only
C. both Ⅰ and Ⅱ
D. neither Ⅰ nor Ⅱ
[单项选择]Addition of weight above the center of gravity of a vessel will ALWAYS（）.
A. reduce initial stability
B. increase righting moments
C. increase GM
D. All of the above
[单项选择]The center of gravity of a freely swinging load suspended from a pedestal crane acts as if it were located at the（）.
A. counterweight
B. pedestal
C. longitudinal centerline
D. point of suspension
[单项选择]A virtual rise in the center of gravity of a ship may be caused by（）.
A. filling a partially filled tank
B. using fuel from a pressed fuel tank
C. emptying a partially filled tank
D. transferring pipe from the setback area to the pipe rack
[单项选择]The point to which your vessel’s center of gravity (G) may rise and still permit the vessel to have positive stability is called the（）.
A. metacentric point
B. metacenter
C. metacentric radius
D. tipping center
[单项选择]A virtual rise in the center of gravity may be caused by（）.
A. filling a partially filled tank
B. using an on board crane to lift a freely swinging heavy object
C. emptying a partially filled tank
D. transferring ballast from the forepeak to the after peak
[单项选择]If the vertical center of gravity (VCG) of a ship rises 1.7 feet，the righting arm (GZ) for the various angles of inclination will（）.
A. decrease
B. increase
C. remain unchanged
D. be changed by the amount of GG' x cosine of the angle
[单项选择]If the vertical center of gravity (VCG)of a ship rises 1.7 feet,the righting arm (GZ) for the various angles of inclination will（）.
A. decrease
B. increase
C. remain unchanged
D. be changed by the amount of GG'x cosine of the angle
[名词解释]目标距离target distance
[单项选择]Limit switches on gravity davits should be tested by（）.
A. the engineers，from a panel in the engine room
B. shutting off the current to the winch
C. pushing the switch lever arm while the winch is running
D. All of the above
[单项选择]The falls on gravity davits are（）.
A. manila
B. nylon
C. wire
D. All of the above
[单项选择]When hoisting a boat on gravity type davits using an electric motor driven winch，the davit arms should be brought up（）.
A. to their final position with the winch operating at slow speed
B. to the bar stop，and then hand cranked to their final position
C. until just before they make contact with the limit switch，and then hand cranked to their final position
D. to the embarkation deck，and then hand cranked to their final position
[单项选择]In a purifier changing to a gravity disc with larger hole diameter will move the interface towards the （）.
A. bowl periphery
B. bowl center
C. upper surface
D. lower surface
[单项选择]For a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the（）.
A. bowl periphery
B. bowl center
C. upper surface
D. lower surface
[单项选择]What is the purpose of the limit switch on gravity davits?（）
A. To cut off the power when the davits hit the track safety stops
B. To stop the davits from going too fast
C. To cut off the power when the davits are about 12 inches or more from the track safety stops
D. None of the above
[单项选择]The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no （） is found in the water outlet.
A. water
B. oil
C. scale
D. ridge
