更多"The velocity of a rotary tidal curr"的相关试题:
[单项选择]The velocity of the current in large coastal harbors is（）.
A. predicted in Tidal Current Tables
B. unpredictable
C. generally constant
D. generally too weak to be of concern
[单项选择]A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles is approximately（）.
A. 3 hours
B. 6 1/2 hours
C. 12 1/2 hours
D. 25 hours
[单项选择]The drift and set of tidal，river，and ocean currents refer to the（）.
A. position and area of the current
B. speed and direction toward which the current flows
C. type and characteristic of the current's flow
D. None of the above
[单项选择]（）outlines the Admiralty method of Harmonic tidal analysis for long and short observation periods plus a volume on datums for hydrographic surveys.
A. Ocean Passages for the World
B. Admiralty Tidal Stream Atlases
C. Admiralty Manual of Tides
D. Admiralty Tidal Handbooks
[单项选择]（）offers a detailed description of tidal theory and its application to the analysis and prediction of tides and tidal streams.
A. Ocean Passages for the World
B. Admiralty Tidal Stream Atlases
C. Admiralty Manual of Tides
D. Admiralty Tidal Handbooks
[单项选择]In a river subject to tidal currents，the best time to dock a ship without the assistance of tugs is（）.
A. at high water
B. when there is a following current
C. at slack water
D. at flood
[单项选择]High-velocity fog（）.
A. is a finer，more diffuse water spray than low-velocity fog
B. requires that the water pressure be no greater than 60 psi
C. produces an effective fog pattern no more than 6 feet beyond the nozzle
D. extinguishes a fire by absorbing heat and reducing the supply of oxygen
[单项选择]
When does auxiliary burner of rotary nozzle incinerator begin to work? （）
Ⅰ.hen igniting
Ⅱ.he sludge for dealing with is too much
Ⅲ.efore stopping incinerator
A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ
[单项选择]If a firefighting situation calls for low-velocity fog you would（）.
A. order the engine room to reduce pressure on the fire pump
B. put the lever on an all-purpose fire nozzle all the way forward
C. attach a low-velocity fog applicator with the nozzle shut down
D. put the lever on an all-purpose fire nozzle all the way back
[单项选择]In a turbocharger, inlet air velocity is increased in the（）.
A. inlet nozzle ring
B. stationary diffuser passages
C. compressor outlet volute
D. rotating impeller vanes
[单项选择]The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the （）
A. inlet nozzle ring
B. turbine wheel blade
C. diffuser passages
D. inlet vol
[单项选择]The rising velocity of the globules carries them upwards where they become trapped by the under surfaces of plates and （）until the enlarged globules have sufficient rising velocity to travel along the plate surface and break away at periphery.
A. disperse
B. coalesce
C. compress
D. shrinkage
[单项选择]Data relating to the direction and velocity of rotary tidal currents can be found in the （）.
A. Mariner's Guide
B. Tidal Current Tables
C. Nautical Almanac
D. Tide Tables
[单项选择]The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the （）.
A. camshaft
B. reduction gears
C. rocker arm
D. connecting or piston rod
[单项选择]With reference to a rotary vane steering gear system, which one of the following statements is true?（）
A. The three moving vanes and the three fixed vanes form three pressure chambers
B. The three moving vanes and the three fixed vanes form six pressure chambers
C. The three moving vanes and the three fixed vanes form nine pressure chambers
D. The three moving vanes and the three fixed vanes form twelve pressure chambers
[单项选择]A special device that，when fitted into the rotary table，transmits torque to the kelly and simultaneously permits vertical movement of the kelly to make the hole is called a（）.
A. master bushing
B. kelly slips
C. kelly bushing
D. rotary bushing
[单项选择]Operating a rotary pump at speeds in excess of design requirements could cause（）.
A. decreased clearances between rotating parts
B. decreased slippage to the suction side of the pump
C. air binding in the discharge ports
D. erosion and excessive wear
[单项选择]Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?（）
A. Loss of suction
B. Increased clearances
C. Decreased clearance
D. Decreased slippage
[单项选择]An increase in rotor clearances in a rotary pump will （）.
A. increase discharge pressure
B. decrease pump capacity
C. decrease pump cavitation
D. decrease reaction ring clearance
