A mechanical davit is designed to automatically（）.

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• What is the purpose of the limit switch on gravity davits?（）

  A . To cut off the power when the davits hit the track safety stops B . To stop the davits from going too fast C . To cut off the power when the davits are about 12 inches or more from the track safety stops D . None of the above

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  A . OSPF standard hellos B . Cisco Discovery Protocol link detection C . Bidirectional Forwarding Detection D . Fast Link Pulse E . autonegotiatio

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• Network equipment supporting the use of flow control mechanisms has been recently installed. What is the purpose of flow control in a data network?（）

  A . It ensures that data is retransmitted if an acknowledgment is not received. B . It reassembles segments in the correct order on the destination device. C . It provides a mechanism for the receiver to control the transmission speed. D . It regulates the size of each datagram segment. E . All of the above are functions of flow control

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• The main objective of mechanical practice is to help learners to absorb thoroughly the＿＿of a language item.

  A . meaning B . function C . context D . form

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• The main objective of mechanical practice is to help students learn by heart the____ of a language item.

  A . meaning B . function C . context D . form

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• （） is a machine by which electrical energy is transformed into mechanical energy.

  A . An alternator B . An electric motor C . A diesel engine D . A main switchboard

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• The OSPF RFC 3623 Graceful Restart feature allows you to configure IETF NSF in ultivendor networks. When using OSPF Graceful Restart，which mechanism is used tocontinue forwarding packets during a switchover？（）

  A . Reverse Path Forwarding B . Hardware-based forwarding C . UDP forwarding D . Layer 2 Forwarding

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• The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by （）

  A . dirt B . fuel oil C . governor cooling water D . fuel oil tar

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• The OSPF RFC 3623 Graceful Restart feature allows you to configure IETF NSF in ultivendor networks. When using OSPF Graceful Restart， which mechanism is used tocontinue forwarding packets during a switchover？（）

  A . Reverse Path Forwarding B . Hardware-based forwarding C . UDP forwarding D . Layer 2 Forwarding

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• The maximum speed of lowering for a lifeboat on gravity davits is controlled by the（）.

  A . limit switches B . emergency disconnect switch C . governor brake D . position of the counterweight on the brake handle

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• When a davit-launched raft is lowered from a ship，upon becoming waterborne，the raft is released by（）.

  A . activating the release lock of the hook B . pulling smartly on the knobbed cocking lanyard C . the effects of buoyancy removing the weight of the raft from the hook D . releasing the boarding flap and the bowsing line

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• Which statement is true about the components of a queuing mechanism？（）

  A . Each subinterface has its own hardware queue and can experience congestion just like its main interface B . Hardware queuing is only used if the software queues are experiencing congestion. C . Hardware queues and software queues are not used concurrently. D . The hardware queuing system always uses the FIFO queuing mechanism.

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• The davit aboard a ship is used to（）.

  A . lower personnel down by a transfer basket B . lower food and water to personnel in a life raft C . lower the life raft down with its full complement D . move equipment around the deck

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• On open lifeboats，the purpose of the wire stretched between the davit heads is to（）.

  A . keep the movement of the davits at the same speed B . keep the davits from slipping when they are in the stowed position C . prevent vibration during lowering of the boat D . support the manrope

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• A(n) （） is a mechanical attack on the metal surface which may be due to a disturbance in the flow of the water over the blade of the propeller.

  A . erosion B . corrosion C . pitting D . dezincificatio

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• Which sequence is correct when launching a lifeboat stowed in gravity davits?（）

  A . Release gripes，turn on emergency disconnect switch，release frapping lines B . Release tricing pennants，turn on emergency disconnect switch，release frapping lines C . Operate limit switches，release gripes，lift brake D . Release gripes，lift brake，release tricing pennant

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• With reference to a two ram actuating mechanism, which one of the following statement is false?（）

  A . The rams work inside cylinders B . The cylinders have glands sealing their open ends C . The rams are connected to a cross-head D . The cross-head is mounted on the rudder stock

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• Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）

  A . a combination of constant volume and constant pressure B . a combination of constant temperature and constant pressure C . entirely constant pressure D . entirely constant volume

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• The lifeboats on your vessel are stowed on cradles on deck and are handled by sheath-screw boom davits. Which of the following statements about launching a boat is TRUE?（）

  A . The boat should be hoisted a few inches clear of the cradle before cranking out the davits B . The inboard gripes should be cast off before the outboard gripes C . The outboard section of the cradle must be released D . The tricing pendants will automatically bring the boat alongside at the embarkation deck

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• Through a （） pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.

  A . positive displacement B . ejector C . centrifugal D . air compressor

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• Multi Protocol Label Switching （MPLS） is a data-carrying mechanism that belongs to the family of packet-switched networks. For an MPLS label， if the stack bit is set to1， which option is true？（）

  A . The stack bit will only be used when LDP is the label distribution protocol B . The label is the last entry in the label stack. C . The stack bit is for Cisco implementations exclusively and will only be used when TDP is the label distribution protocol. D . The stack bit is reserved for future use.

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• People tend to assume that it is a girl who owns a curling iron and also that a camera operator or a mechanic would be a man. This is known as implicit bias.

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• Which routing algorithm is described below？ It is a mechanism in which the setding station determines the route the frame will follow and includes the routing information with the frame; bridges read

  A、Fixed Routing B、Spanning Tree C、Source Routing D、Frame Forwarding

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• Now mechatronics still means a mechanism that is electrified.（）

  是 否

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