A wind vane on a moving vessel shows ______.A.dead reckoning wind directionB.true wind dir

A．weather vane，wind vane or wind sock

B．hydrometer

C．hygrometer

D．sling psychrometer

Apparent wind speed blowing across a vessel under tow can be measured by a(n)______．

A.barometer

B.wind vane

C.anemometer

D.Thermometer

Which statement is NOT true？

A.In a simple vane pump, the rotor and cam ring are exactly concentric

B.Balanced vane pump has an elliptical cam ring

C.Liquid in both gear pump and vane pump are forced out to the outlet.

D.Balanced vane pumps can work at a higher pressure than the simple vane pump

Which statement is NOT true？

A.While displacement pump works, volume of the working chamber will increase and decrease alternately

B.A gear pump always has two gears

C.Any vane pump will have a rotor within a ring

D.A balanced vane pump has two outlet ports and they are positioned symmetrically

A.vane

B.gear

C.rotor

D.blade

A．Flowrate doesnotchangewithrotorspeed

B．Flowratedecreaseswithrotorspeeddown

C．Flowrateincreaseswithrotorspeedup

D．Noneoftheabove

A.gear

B.vane

C.cam-and-piston

D.screw

E.centrifual

ALTERNATOR

PITOT/VANE HEAT

SCREEN HEAT

ENG IGNITION

A.3D ASL

B.3D Vane

C.4D Trance

D.4D ASL