更多"What is the function of the thrust "的相关试题:
[单项选择]A thrust bearing is used with a propulsion diesel engine to （）.
A. control axial movement of the crankshaft
B. transmit engine thrust to the propeller shaft
C. absorb vibrations in the propeller shafting
D. prevent propeller thrust from being transmitted to the hul
[单项选择]What type of stern tube bearing has the least friction（）.
A. Oil-lubricated bearings
B. Lignum vitae
C. Hard rubber
D. Bronze bushings
[单项选择]What is NOT used as a stern tube bearing，on a large vessel? （）
A. Wooden (lignum vitae) strips
B. Hard rubber
C. Resin bonded composition
D. Bronze bushings
[单项选择]What function is provided by the crankcase ventilation system on some diesel engines?（）
A. Increases the sludge forming tendency of lube oil
B. Prevents the accumulation of combustible gases
C. Improves lube oil cooling
D. Improves cold weather starting
[单项选择]What is the function of thermostatic expansion valve in a compression refrigeration system?（）
A. nonexistent
B. for controlling pressure
C. for controlling superheat
D. for controlling the solenoid valve
[单项选择]What is the function of the command switchport trunk native vlan 999 on a？（）
A. It designates VLAN 999 for untagged traffic.
B. It blocks VLAN 999 traffic from passing on the trunk.
C. It createsa VLAN 999 interface.
D. It designates VLAN 999 as the default for all unkown tagged traffic.
[单项选择]What following is not among the function of SOLAS ships?（）
A. receive shore-to-ship distress alerting
B. transmit ship-to-shore distress alerting
C. receive message for public correspondence
D. transmit and receive locating signals
[单项选择]What is the function of wearing rings found on some centrifugal pumps? （）
A. Absorb erosion of high velocity discharge stream
B. Seal pump shaft against entry of air
C. Isolate the outlet side from the inlet side
D. Dampen the turbulent discharge flow
[单项选择]What is the function of the after-cooler installed in the diesel engine air intakes system?（）
A. Decrease the air density
B. Increase the exhaust temperature
C. Decrease the lube oil temperature
D. Increase the air density
[单项选择]What is the function of the Cisco IOS command ip nat inside source static 10.1.1.5 172.35.16.5（）。
A. It creates a global address pool for all outside NAT transactions
B. It establishes a dynamic address pool for an inside static address
C. It creates dynamic source translations for all inside local PAT transactions
D. It creates a one-to-one mapping between an inside local address and an inside global address
E. It maps one inside source address to a range of outside global addresses
[单项选择]What is the function of an air receiver in the compressed air system on a ship? （）
A. Condenses moisture
B. Provides overpressure protection
C. Purifies the air
D. Acts as an accumulator
[单项选择]What is the function of an engine’s stationary parts?（）
A. To add power to the engine
B. To keep the engine firmly attached to its supporting base
C. To keep moving engine part in their proper relative positions
D. To rotate the crankshaft
[单项选择]What is a function of the wearing rings used in most centrifugal pumps?（）
A. Absorb erosion of high velocity discharge stream
B. Seal pump shaft against entry of air
C. Isolate the discharge side from the suction side
D. Dampen the turbulent discharge flow
[单项选择]What is NOT a function of the air supply of a covered lifeboat?（）
A. Provides air for engine combustion
B. Pressurizes water spray system
C. Provides air for passenger respiration
D. Prevents smoke and other noxious fumes from entering craft
[单项选择]What is NOT a function of the steam drum of a marine water-tube boiler（）.
A. Receives saturated steam from the generating tubes
B. Serves as a reservoir of boiler feed water
C. Holds internal fittings for separation of moisture from steam
D. Collects steam exhausted from the turbines
[单项选择]A thrust block is designed to（）.
A. absorb the shock of wave pressure at the bow
B. be placed between the engines and the foundation to absorb the vibration
C. transmit the thrust of the engine to the propeller
D. transmit the thrust of the propeller to the vessel
