更多"What is TRUE of pressure/vacuum val"的相关试题:
[单项选择]Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
A. double bottom fuel oil tank temperature
B. heater supply steam flow
C. pressure of the fuel supplied to the burners
D. attemperator steam flow in the heater discharge circuit
[单项选择]Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）
A. Pressure-reducing valve
B. Unloading valve
C. Counterbalance valve
D. Pressure-relief valve
[单项选择]What is the purpose of pressure-vacuum relief valves? （）
A. Regulation of discharge pressure from cargo pumps
B. Maintaining constant velocity in cargo lines
C. Regulation of suction head on cargo pumps
D. To maintain a tank or void at atmospheric pressure
[单项选择]What is the purpose of the intake/exhaust valves in a diesel engine? （）
A. They regulate the combustion cycle
B. They supply cooling water
C. They synchronize the ignition spark
D. They supply and regulate the lubricant flow
[单项选择]What is TRUE concerning frapping lines?（）
A. They are used to steady a lifeboat when lowered
B. They are normally attached to the davit span
C. They are needed only on radial davits
D. They are used to clear the puddings
[单项选择]What is TRUE about hoisting operations?（）
A. Personnel may work beneath suspended loads，as long as they are alert and wear hard hats
B. If a suspended load with no tag begins to spin，personnel should attempt to stop the spinning if the load is within reach
C. If tag lines are used to control a suspended load，they should be secured to the deck
D. Personnel not involved in the hoisting operation should be kept clear of the transfer area
[单项选择]What is TRUE when operating in fog and other vessels are detected by radar?（）.
A. You should make an ample change to port for a vessel crossing on the starboard bow
B. You should maneuver in ample time if a close-quarters situation is developing
C. You should determine the course and speed of all radar contacts at six minute intervals
D. Long-range scanning will provide early warning of ALL other vessels within the radar's range
[单项选择]What kind of pressure systems travel in easterly waves（）.
A. High pressure
B. Low pressure
C. Subsurface pressure
D. Terrastatic pressure
[单项选择]What separate the high pressure side from the low pressure side in a refrigeration system?（）
A. Condenser and thermal expansion valve
B. King and solenoid valves
C. Compressor and thermal expansion valve
D. Condenser and solenoid valve
[单项选择]What is TRUE of the history display of a target’s past positions on an ARPA?（）
A. It provides a graphic display to emphasize which vessel is on a collision course
B. In the true presentation，it provides a quick visual check to determine if a vessel has changed course
C. The display is one of the primary inputs and must be in use when using the trial maneuver capability
D. It provides a graphic display of a target vessel's relative course，speed，and CPA
[单项选择]In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.
A. the beveled edges of the intake valves provide for serf-centering during seating
B. intake valves utilize stellite-coated valve seat inserts which reduce wear
C. the volume of air passing through intake valves is less than the volume of air passing through exhaust valves
D. intake valves are less affected to the corrosive action of exhaust gases
[单项选择]The fuel oil pressure and forced draught pressure should be matched to ensure good combustion with a full steady flameIn the sentence the word “match” means （）
A. join with
B. mix
C. be equal to
D. be constant
[单项选择]High pressure and low pressure alarms must be tested（）.
A. no earlier than 24 hours prior to loading
B. no later than 24 hours prior to loading
C. anytime prior to loading
D. weekly
[单项选择]The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.
A. soluble state
B. solid state
C. liquefied state
D. inert state
[单项选择]What is true about Quality of Service （QoS） for VPNs？（）
A. QoS preclassification is only supported on generic routing encapsulation （GRE） and IPsec VPNs
B. QoS preclassification is not required in Layer 2 Tunneling Protocol （L2TP）， Layer2 Forwarding （L2F）， and Point-to-Point Tunneling Protocol （PPTP） VPNs
C. QoS preclassification is supported on IPsec AH VPNs， but not on IPsec ESP VPNs
D. the QoS-for-VPNs feature （QoS preclassification） is designed for VPN transport interfaces
E. with IPsec tunnel mode， the type of service （ToS） byte value is copied automatically from the original IP header to the tunnel header
[多项选择]What is true about access control on bridged and routed VLAN traffic？（）
A. Router ACLs can be applied to the input and output directions of a VLAN interface
B. Bridged ACLs can be applied to the input and output directions of a VLAN interface
C. Only router ACLs can be applied to a VLAN interface
D. VLAN maps and router ACLs can be used in combination
E. VLAN maps can be applied to a VLAN interfac
