更多"When used with reversing reduction "的相关试题:
[单项选择]In using reduction gears to obtain efficient propeller speeds, （）.
A. they must be located at the after end of the engine
B. they can only be used with one engine at a time
C. they eliminate the need for controllable pitch propellers
D. they are connected to the engine with a flexible coupling
[单项选择]Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however （）.
A. toxic
B. flammable
C. explosive
D. all of the above
[单项选择]When used in conjunction with a turbocharger, the main function of an after-cooler is to （）
A. increase the density of the cylinder air charge
B. prevent turbocharger overheating
C. liminate the need for a pre-cooler
D. remove moisture from air compressed by the turbocharger
[多项选择]Which commands, when used together, would create an 802.1Q link?（）
A. Switch(vlan)# mode trunk
B. Switch(config)# switchport access mode trunk
C. Switch(config-if)# switchport mode trunk
D. Switch(config-if)# switchport trunk encapsulation dot1q
E. Switch(config)# switchport access mode 1
F. Switch(vlan)# trunk encapsulation dot1q
[单项选择]The term restricted visibility，when used in the Rules，refers to（）.
A. situations when you can see vessels on radar that you cannot see visually
B. visibility of less than half a mile
C. any condition where visibility is restricted
D. visibility where you cannot see shore
[单项选择]When used to fight fire，carbon dioxide（）.
A. is effective if used promptly on an oil fire
B. has a greater cooling effect than water
C. is lighter than air
D. is harmless to cargo and crew
[单项选择]Which of the devices listed, when used on an electro-hydraulic steering gear, keeps the movement of the redder closely in step with the steering wheel?（）
A. The follow-up gear
B. The rudder angle indicator
C. The synchronous electric transmitter
D. A rudder angle limit switch
[单项选择]When transmitted by a reduction gear, diesel engine speed is reduced and the torque available for work （）
A. remains the same
B. is reduced
C. is increased
D. is eliminated
[单项选择]When whistle signals are used for launching lifeboats，one short blast means（）.
A. use the float-free method only
B. lower all boats
C. raise all boats
D. drill is over，secure all boats
[单项选择]What equipment is customarily used when seamen are working on a stage rigged over the side of a vessel（）.
A. Jacob's ladder
B. Manropes
C. Heaving lines
D. All of the above
[单项选择]When fire pumps are used for other than firefighting service，each pipe connecting the other service (except for branch lines used for deck washing) must have a（）.
A. check valve installed in the line
B. shut off valve at a manifold near the pump
C. quick disconnect union within ten feet of the pump
D. regulator in the line set at 125 psi
[单项选择]A chain bridle is used when towing astern because it（）.
A. Is easy to connect
B. Provides an effective catenary and absorbs shock due to its weight
C. Makes rigging a swivel unnecessary
D. Prevents the tow from yawing by the drag of the chains in a seaway
[单项选择]Which channel and mode should be used when initiating a distress alert transmission（）.
A. Channel 6 DSC
B. Channel 6 Radiotelephony
C. Channel 13 Radiotelephony and channel 16 DSC
D. Channel 70 DSC
[单项选择]Wale shores would be used when drydocking a vessel with（）.
A. tumble home
B. excessive deadrise
C. excessive trim
D. a list
[单项选择]When dry chemical extinguishers are used to put out class B fires，there is a danger of reflash because dry chemical（）.
A. is not an effective agent on Class B fires
B. does little or no cooling
C. dissipates quickly
D. is rapidly absorbed by the liquid
[单项选择]More exact assessment of visibility when（）is used to determine the range of vessel or other objects in the vicinity.
A. radar
B. omega
C. satellite navigator
D. DF
