slipper ring or swash plate of the variable delivery pump. A cut-off lever
connected to the moving tiller will bring the floating lever pivot and the lever into line at right angles to the screw shaft axis. At this point the rudder angle will match the bridge lever angle and the pumping action will stop. For local manual control, the electrical control is switched off and a small hand-wheel is connected to the screw shaft. Rotation of the hand-wheel will move the floating lever and bring about rudder movement as desired. 1. This passage is mainly on ______.
A. the electrical remote control of main engines B. the electrical control equipment of steering gears C. the bridge remote control of main engines
D. the control box assembly in steering gear compartment 2. The advantage of the control equipment is ______.
A. that the transmitter is on the bridge
B. that local manual control can be achieved. C. that remote control cab be achieved.
D. simple in construction and reliable in operation. 3. The function of the cut-off lever is ______.
A. to provide electrical signal B. to provide feed-back C. to provide local manual control D. to provide right rudder angle 4. Another name for the “swash plate” in the variable delivery pump is ______. A. tiltable disc B. gravity disc C. distributing disc D. catch plate
Lesson 19
Cargo Handling Equipment
单项选择题：
1. These include deck machinery such as mooring equipment, anchor handling equipment, cranes and _______. A. boilers B. bow thrusters C. stabilizer D. hatch covers
2. A warp end may be fitted for operating the derrick topping wire which adjusts the derrick ________. A. length B. slack C. height D. rotation direction
3. In a general cargo crane, three principal movements are ______; ______; _______. A. hoisting / luffing / slewing B. lifting / raising / lowering C. rotating / raising / handling D. hoisting / lowering / moving
4. For occasional heavy loads, two cranes can be arranged to work together. The operating ________ for deck crane motors may be hydraulic electric. A. principle B. medium C. instruction D. voltage
5. In the cargo winch, spur reduction gearing transfers the motor drive to ________. A. the topping light B. the board brake C. the fail-safe D. the barrel shaft
6. The drive motor will have a brake arranged to fail-safe, i.e. it will _______ the
load if power fails or machine is stopped. A. lift B. put C. take D. hold
7. _______ are used for hauling in or letting out the wires which fasten the ship to the shore.
A. Cargo winches B. Mooring winches C. Windlasses D. Cargo hatches
8. When the union purchase derrick is operated, one derrick is positioned over the quayside and the other almost vertically over the _______. A. dock B. hold C. pedestal D. machinery space
9. Topping wires fix the height of the derricks and ______ to the deck may be used to prevent fore and aft movement. A. stays B. winches C. barrels D. brakes
10. _______ or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore. A. The winch motor B. The band brake C. The winch barrel D. The anchor capstan 11. The _______ is used for hauling in or letting out the wire or ropes. A. windlass B. anchor capstan C. turning gear D. winch barrel 12. Manually operated band brakes may be fitted and _______ will have a brake arranged to fail-safe. A. the drive pump B. the drive motor C. the warp end D. the purchase
13. Anchor _______ are used in some installations where the cable lifter rotates about a vertical axis. A. windlasses B. drums C. capstans D. warp ends
14. Prior to running the hydraulic pump, examine the system carefully and ensure that the lever of control valves is in ________ position. A. neutral B. end C. opening D. closure
15. Anchor capstans are used in some installations where the cable lifter rotates about a _______. A. horizontal axis B. crankshaft C. vertical axis D. camshaft 16. ______unit is mounted so as to raise and lower the cable from the spurling pipe, which is at the top and center of the chain or cable locker.
A. The cable lifter B. The hoisting motor C. The topping wire D. The life-raft
17. The ______belongs to the anchor handling equipment.
A. chain lifter B. winch barrel C. slewing rim D. warping drum 18. Which of the motors for the devices listed below is fitted with an instantaneous overload relay?
A. Fan B. Pump C. Winch D. Machine tool
19. In which of the listed hydraulic systems will the installation of an oil cooler be necessary?
A. Constant tension mooring winch system B. Hatch cover system
C. Watertight door system D. Internal combustion engine hydraulic
starter system
20. The clutch band of a constant tensioning mooring winch must be set up tight enough to drive the winch drum and should slip only when ______.
A. excessive loads are placed on the winch B. minimum pull is being exerted by the winch
C. automatic operation of the winch is desired D. wire is being retrieved at the maximum rate
21. ______are used for cargo handling.
A. Cranes B. Mooring winches C. Windlasses D. Foreman 22. In a general cargo crane, ______is fitted to lift the cargo load.
A. the slewing motor B. the luffing motor C. the hoisting motor D. the fan moter
23. ______are used to handle anchors and chains.
A. Cargo winches B. Mooring winches C. Windlasses D. Cargo hatches
二、关联题（每组关联题题干下有4个小题，每小题4个选项）
第一组：Battery maintenance is substantially（充分的） the same for both types of
battery. Cell tops must be kept The hoisting of the cargo is effected by a hoisting winch driven by a hydraulic motor that provides a constant torque in both directions of rotation and at all speeds within the regulation range of the motor. The winch is equipped with a mechanical belt brake that acts on the outside of the rotating motor housing. During operation, the brake is released by means of oil pressure which compresses a spring. The crane jib is raised and lowered by means of a luffing winch is constructed in a similar manner to the hoisting winch. The pumps are axial piston pumps and are driven by a common 3-phased asynchronous motor at a constant speed of rotation. The capacity of the pump is changed by turning the swash-plate. The crane is turned by a hydraulic motor of the same type as that described above, in that the rotor turns a pinion which engages with a toothed ring on the crane housing.
An oil cooler is used to remove the heat generated in the oil during the operation of the crane. The system is also provided with a pre-heater for heating the oil in cold weather. If the temperature of the oil reaches 85?C, a thermostat in one of the oil lines switches off the electric motor.
Pressure relief valves are built into the system to protect the system and the crane against excessive loads. All moving parts in the hydraulic system are lubricated by means of the oil in the system..
The crane housing, which is a welded construction on a rigid base-plate, contains all the mechanical machinery, the hydraulic system and the electrical equipment. The top of the crane housing and the jib carry blocks for wires for the hoisting of the cargo and the raising of the jib. All of the blocks have enclosed ball bearing.
1. Which of the following is true about the hoisting of the cargo?
A. an electric motor provides a constant torque. B. an hoisting winch is used.
C. a mechanical brake acts on the hoisting cable. D. All of the above are true. 2. The pumps _____.
A. are driven by variable speed electric motors B. turn the crane
C. may deliver variable capacity by turning the swash plate D. B and C are true
3. Which of the following is true about the oil in the system? A. It can be cooled in a cooler.
B. Its temperature can exceed 85 degrees centigrade in no account. C. It can be used to lubricate moving parts. D. All of the above are true.
4. Which of the following is true?
A. The mechanical brake is released by means of a strong spring. B. At least three hydraulic motors are fitted to the system. C. The crane housing is of forged construction. D. The blocks are installed on the base-plate.
二. 关联题（关联题题干下有4个小题，每小题4个选项）
The windlass is the usual anchor-handling device where one machine
may be used to handle both anchors. A more recent development, particular on larger vessels, is the split windlass where one machine is used for each anchor. The rotating units of a split windlass consist of a cable lifter with shaped snug to grip the anchor cable, a mooring drum for paying out or letting go of mooring wires and a warp end for warping duties. Each of these units may be separately engaged or disengaged by means of a dog clutch, although the warp end is often driven in association with mooring drum. A spur gear assembly transmits the motor drive to the shaft where the various dog clutches enable the power take-off. Separate band brakes are fitted to hold the cable lifter and the mooring drum when the power is switched off.
The cable lifter unit is mounted so as to raise and lower the cable from the spurling pipe, which is at the top and the chain or cable locker.
Anchor capstans are used in some installations where the cable lifter rotates about a vertical axis. Only the cable lifter unit is located on deck, the driving machinery being on the deck below.
1. According to the passage, the rotating units of a split windlass don?t
include______.
A. a cable lifter B. a mooring drum C. a chain locker D. a warp end
2. The word “assembly” in the sentence “ A spur gear assembly transmits the motor
drive to the shaft where the various dog clutches enable the power take-off.” is as the same meaning as ______.
A. unit B. shaft C. dog clutch D. spurling pipe 3. One of the functions of a dog clutch is ______.
A. to transmit the motor drive to the shaft
B. to hold the cable lifter and the mooring drum when the power is switched off
C. to engage or disengage the rotating units of a split windlass separately D. to handle both anchors
4. Which of the following statements is correct ?
A. A more recently development, particularly on larger vessels, is the split windlass where one machine is used to handle both anchors. B. The word “machine” in the passage refers to the windlass.
C. Anchor capstans are used in some installation where the cable lifter rotates about a horizontal axis.
D. Both the cable lifter unit and the driving machinery are located on deck.
Lesson 20
Marine Refrigeration
单项选择题：
1. The boiling and condensation points of a refrigerant depend on the ______ exerted upon it.
A. temperature B. pressure C. velocity D. heat
2. In the condenser, the hot, high pressure refrigerant gas is cooled by the sea water and becomes _______. A. fresh water B. vapor C. mixture D. liquid
3. If a refrigeration compressor is running continuously without lowering temperature as normal in the refrigerator, the trouble may be ________. A. excessive condenser cooling water B. warm food in the refrigerator C. a shortage of refrigerant D. a shortage of compressor oil 4. Refrigerant enters the condenser as a ________. A. high pressure liquid B. low pressure vapor C. high pressure vapor D. low pressure liquid
5. The low pressure side of a refrigeration system is considered to exist from the _______.
A. expansion valve to the compressor B. receiver to the expansion coil C. expansion valve to the evaporator D. condenser to the expansion valve 6. The component of a refrigerating system in which the refrigerant vaporizes and absorbs heat is known as the _______. A. condenser B. vapor generator C. accumulator D. evaporator
7. Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?
A. The condenser and the expansion valve B. The king valve and the solenoid valve
C. The compressor and the expansion valve D. The condenser and the solenoid valve
8. Which of the listed refrigeration system components keeps the refrigerant circulating through the system? A. Expansion valve B. Condenser C. Evaporator D. Compressor