單項(xiàng)選擇題Compensated flow control or constant flow valves are used in hydraulic systems to()

A.compensate for major leaks in the system
B.maintain the original fluid viscosity
C.allow for changes in pressure and temperature within the system
D.assure constant fluid temperature


您可能感興趣的試卷

你可能感興趣的試題

1.單項(xiàng)選擇題To avoid damaging the components of a printed circuit board when testing it with a DC volt-ohmmeter, you should ()

A.ground the board
B.avoid reversing the polarity of the leads
C.isolate sensitive components with heat sinks
D.all of the above

2.單項(xiàng)選擇題The heated feedwater entering any flash chamber of a flash-type evaporator will()

A.vaporize, with the unflashed water remaining at the temperature at which it entered the flash chamber
B.vaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamber
C.vaporize, with the remaining water at the temperature greater than it entered the flash chamber
D.boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber

3.單項(xiàng)選擇題In a refrigeration system, which of the following statements describes the actions occurring when a solenoid valves, used in conjunction with an unloader head is energized?()

A.The solenoid valves directs high pressure gas to the valve lifting device raising the suction valve off its seat and causing one specific cylinder to become unloaded
B.The solenoid valves directs high pressure gas to the underside of the unloading piston, causing it to rise and allowing the recirculating ports to be opened
C.When the solenoid valve becomes energized, the valve ports become closed, allowing discharge pressure to build up above the piston, shifting it and causing it to unload
D.The solenoid valve allows the refrigerant to pass from the suction chamber to the top of the unloader piston, causing the piston to lift and unload the cylinder

4.單項(xiàng)選擇題The efficiency and output capacity of a low pressure distilling plant will be reduced if the last effect shell ()

A.pressure does not fluctuate rapidly
B.pressure remains steady and unchanged
C.brine density does not exceed 1~5
D.brine density is too low

5.單項(xiàng)選擇題In most pumps and pump motors overpacking the ball bearings full of grease will result in ()

A.moisture emulsification of the bearing grease
B.insufficient circulation and overheating of the bearing
C.proper grease circulation to cool the bearing
D.sliding friction between balls and races

最新試題

The shipboard oil pollution emergency plan will be invalid after ()

題型:單項(xiàng)選擇題

The main purpose of port State control is not to()

題型:單項(xiàng)選擇題

Which one is NOT the ‘clear grounds’ for a more detailed inspection?()

題型:單項(xiàng)選擇題

The additional mark ()in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

題型:單項(xiàng)選擇題

As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?()

題型:單項(xiàng)選擇題

During the diesel engine running, the water level of F.W expansion tank should normally kept in the () level of glass tube.

題型:單項(xiàng)選擇題

By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a()

題型:單項(xiàng)選擇題

When does auxiliary burner of incinerator put into operation? ()Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish

題型:單項(xiàng)選擇題

The ISPS Code consists of a mandatory section-Part A, which shows()

題型:單項(xiàng)選擇題

Flame failure in an automatically fired auxiliary boiler can from a/an ()

題型:單項(xiàng)選擇題