网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
The（）is fitted in the main steam supply line and is usually of the non-return type.
A
main steam stop valve
B
auxiliary steam stop valve
C
feed check or control valve
D
blow down valve
参考答案
参考解析
解析：
暂无解析
更多 “单选题The（）is fitted in the main steam supply line and is usually of the non-return type.A main steam stop valveB auxiliary steam stop valveC feed check or control valveD blow down valve” 相关考题
考题
The price of goods usually rises when the supply is not ____ to the demand.
A. leadingB. normalC. adequateD. average
考题
______ is not usually used in liquid cargo systems．A.Hydraulic drive systemsB.Electric drive systemsC.Steam drive systemsD.Man-powered drive systems
考题
An intermediate spring is ______.A.fitted in each leg of the towing bridleB.generally located between the “fishplate” and the main towing hawserC.secured at the “H” bittsD.usually made of manila hawser
考题
单选题The vacuum maintained in the salt water feed heater shell of a flash-type evaporator is generally accomplished by （）.A
a separate air ejector unitB
a direct unimpeded connection between second stage and salt water feed heaterC
either by vacuum drag or an external line from the first stage via a fixed orificeD
the fixed orifice provided in the steam supply line
考题
单选题Before starting a reciprocating, steam-driven pump that has been idle for a period of time, you should （）.A
open the steam line mot valveB
drain the steam cylinderC
close the steam cylinder drainsD
open the liquid cylinder drains
考题
单选题The（） is fitted in pair one is the main valve, the other the auxiliary or standby.A
main stem stop valveB
auxiliary steam stop valveC
feed check or control valveD
blow down valve
考题
单选题To obtain maximum efficiency, two stage air compressors are usually （）.A
horizontally mountedB
never fitted with intake filtersC
fitted with intercoolersD
operated in an unloaded condition at all times
考题
单选题A gypsy or gypsyhead is a（）.A
punt used for painting over the sideB
small, reciprocating steam engineC
spool-shaped drum fitted on a winchD
swinging derrick
考题
单选题Between the steam dram and the smaller water dram below, large numbers of smaller diameter （） tubes are fitted.A
fireB
water wallC
generatingD
down comer
考题
单选题The load between two steam-driven alternators operating in parallel may be adjusted by varying （）A
the speed of the alternatorsB
the field strength of the machinesC
the power factor of the alternatorsD
steam supply to the prime movers
考题
单选题Air chambers are usually fitted to reciprocating pumps in order to （）.A
increase discharge pressureB
increase suction vacuumC
develop pulsation flowD
keep a steady rate of flow
考题
单选题To assist separation of low viscosity oils steam coils or electric heaters are fitted （） of the oily water separator.A
in entranceB
in exitC
in the upper partD
on the outside
考题
单选题Which statement is TRUE about nylon line?（）A
Manila line will usually last longer than nylon lineB
Nylon line is excellent for use in alongside towingC
A normal safe working load will stretch nylon line 50%D
Nylon stoppers should be used with nylon line
考题
单选题An overspeed safety device is usually fitted to a generator engine for （） in the event of overspeed.A
cutting power off the engineB
increasing the fuel pump settingC
braking the crankshaftD
stabilizing the ship speed
考题
单选题After resolving the trouble of main power supply, main switch of emergency generator should（）, if power supply is refreshed.A
be switched off by the duty officerB
be switched on by the duty officerC
be switched off automaticallyD
be switched on automatically
考题
单选题The（） is a smaller valve fitted in the auxiliary steam supply line, and is usually of the non-return type.A
main stem stop valveB
auxiliary steam stop valveC
feed check or control valveD
blow down valve
考题
单选题To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with （）.A
lantern ringsB
bearingsC
easing volutesD
wearing rings
考题
单选题Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）A
double bottom fuel oil tank temperatureB
heater supply steam flowC
pressure of the fuel supplied to the burnersD
attemperator steam flow in the heater discharge circuit
考题
单选题（） or air venting arrangement is fitted to the fuel supply passage.A
An air pumpB
A compressorC
A fuel pumpD
A priming
考题
单选题A donkey boiler is （）.A
one to supply steam to the main propulsion turbineB
an auxiliary boilerC
A and BD
neither A nor B
热门标签
最新试卷