To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the ().
时间:2022-09-19
Attempts are made to eliminate axial thrust in centrifugal pump by ().
时间:2022-09-18
The function of a centrifugal pump double volute casing is to ().
If you must enter a room or compartment to combat the fire, keep an escape path ().
To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with ().
The drive motor will have a brake arranged to fail-safe, ieit will () the load if power fails or machine is stopped.
The emergency bilge suction valve is typically used ().
时间:2022-09-17
Which of the following descriptions best identifies the operating principal of a flash-type evaporator?()
Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? () (1) reciprocating (2) rotary (3) centrifugal
Moisture should be kept out of an R-12 system because it tends to cause ().
The water level in a steaming auxiliary boiler will always ()
The shaft and spare parts() should be well greased in order to avoid corrosion.
The oil in a cargo winch gear box should be sampled periodically to ().
In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the().
A distinguishing feature of an educator, when compared to other pumps, is the ().