更多"What is the function of an air rece"的相关试题:
[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]The scavenge air receiver is of a simplified and modular design with integral non-return flaps, hanging cooler and two auxiliary air blowers（）
A. dozens
B. parcels
C. bundles
D. gallons
[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]A re-heater in an air conditioning system functions to （）.
A. control inlet air temperature
B. control inlet air volume
C. maintain relative humidity at 15%
D. restore conditioned air temperature to a comfortable level
[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 occurs when rising air cools the dew point?（）
A. advection fog forms
B. humidity decrease
C. wind increase
D. Cloud form
[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]On what do you depend having the air cooler of main engine chemically washed?（）
A. increased air pressure differenced before and aft air cooler
B. reduced exhaust temperature in all cylinders
C. reduced temperature difference between water inlet and outlet
D. both A and C
[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 effect of heated intake air on a diesel engine? （）
A. Increases efficiency
B. Increases engine horsepower
C. Increases engine life
D. Reduces engine horsepower
[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 thrust bearing?（）
A. Prevents lateral movement of the slow speed gear
B. Transmits propeller thrust to the hull
C. Keeps spring bearings in line
D. Prevents main reduction gear axial movement
[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 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]What is the function of the command switchport trunk native vlan 999 on a Cisco Catalyst switch?（）
A. It creates a VLAN 999 interface.
B. It designates VLAN 999 for untagged traffic.
C. It blocks VLAN 999 traffic from passing on the trunk.
D. It designates VLAN 999 as the default for all unknown tagged traffic.
[单项选择]Air receivers installed in starting air systems are to be （）.
A. cylindrical in shape with service connections located at the top and bottom
B. opened and made available for inspection during biannual inspections provided
C. with automatic drain traps for the removal of moisture
D. so installed as to make the drain connections effective under extreme conditions of trim
[单项选择]Air entering an air-cooled refrigeration system is indicated by （）.
A. frosting of the liquid line
B. higher than normal head pressure
C. a clear sight glass
D. abnormally cold reefer boxes
