The numeral in the center of a wind rose circle on a pilot chart indicates the ().
- Atotal number of observations
- Baverage wind force on the Beaufort scale
- Caverage wind force in knots
- Dpercentage of calm
The numeral in the center of a wind rose circle on a pilot chart indicates the ().
1、The function of damper windings in a s
The function of damper windings in a synchronous motor is to ().Aeliminate slippageBprovide excitationCprovide starting torqueDincrease efficiency
2、In a () the center screw is driven and
In a () the center screw is driven and the outer screws idle.Asingle screw pumpBdouble-screw pumpCtriple screw pumpDcentripetal pum
3、For a floating vessel,the center of fl
For a floating vessel,the center of flotation is the point in the waterplane().Aabout which the vessel lists and trimsBwhich coincides with t...
4、A virtual rise in the center of gravit
A virtual rise in the center of gravity may be caused by().Afilling a partially filled tankBusing an on board crane to lift a freely swinging heavy objectCemptying a partially filled tankDtransferring ballast from the forepeak to the after peak
5、In the Southern Hemisphere winds in a
In the Southern Hemisphere winds in a low pressure system rotate in a().Aclockwise directionBnortheasterly directionCnortherly directionDcounterclockwise directio
6、The center of flotation of a vessel is
The center of flotation of a vessel is().Athe center of volume of the immersed portion of the vesselBthe center of gravity of the water pla...