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发布时间:2023-10-12 08:43:21

[单项选择]

When a hydraulic vane pump is working, which of the following is in contact with the vanes?()
(1) the rotor
(2) the internal surface of the housing
(3) the external surface of the housing


A. (1) only
B. (2) only
C. (1) and (2)
D. (1), (2) and (3)

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[单项选择]

As for a hydraulic vane pump, which of the following is in contact with the vanes during working: ()
(1)the rotor
(2)the pump shaft
(3)the external surface of the housing


A. (1) only
B. (2) only
C. (1) and (2)
D. (1),(2)and(3)
[单项选择]As for a hydraulic single action vane pump, the inner wall of the stator is usually of () shape.
A. circular
B. elliptical
C. rectangular
D. hexagon
[单项选择]A vane pump belongs to () according to its working principle.
A. reciprocating pump
B. positive displacement pump
C. centrifugal pump
D. centripetal pump
[单项选择]When lighting off an auxiliary boiler, which of the problems listed could cause the burners to sputter?()
A. cold fuel oil
B. low fuel oil pressure
C. low atomizing steam pressure
D. water in the fuel oil
[单项选择]Which pump is the self-priming pump?()
A. turbine
B. centrifugal
C. ejector
D. mixed flow
[单项选择]—Excuse me, could you tell me which bus goes to the Fine Arts Museum? —()
A. No, I can’t.
B. Yes, you’re right.
C. I don’t know either.
D. Sorry, I don’t know.
[单项选择]Which pump installation would require an external source of sealing water?()
A. Main circulator pump jacket water cooling
B. Salt water service pump
C. Auxiliary condensate pump
D. Bilge pump
[单项选择]Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?()
A. Impeller
B. Electric motor
C. Volute
D. Eye
[单项选择]Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?()
A. Close radial clearance between impeller hub and casing
B. Low rotational speed of impeller
C. Removable end plate
D. Replaceable impeller and casing wearing rings
[单项选择]When disassembling or assembling an injection pump plunger and barrel you should ()
A. keep the parts immersed in diesel fuel
B. always keep the plunger and barrel together
C. work over a linoleum-type surface
D. all of the above
[单项选择]When starting a reciprocating pump, the inlet valve should be ().
A. closed
B. opened fully
C. cracked open
D. partly open
[单项选择]When starting a centrifugal pump, the discharge valve should be ().
A. closed
B. opened fully
C. cracked open
D. partly open
[单项选择]Which of the following statements about pump operations is NOT a correct statement?()
A. In order for a fluid to be pumped, a fluid must be made to flow
B. A substance must be cold in order for it to be pumped
C. The kinetic energy imparted by the pump can be used to force a liquid through a hydraulic system
D. A pump must receive its energy from an external source
[单项选择]The part of a windlass which physically engages the chain during hauling or paying out is the().
A. devil's claw
B. bull gear
C. wildcat
D. cat head
[单项选择]The force exerted by a propeller which tends to throw the stern right or left is called().
A. slip
B. sidewise force
C. rotational force
D. thrust
[单项选择]When start a screw pump, the by pass valve should be ().
A. closed
B. opened fully
C. cracked open
D. partly open
[单项选择]With respect to centrifugal pump impellers, which of the following descriptions represents the correct centrifugal pump classification? ()
A. Single stage or multistage
B. High pressure or low pressure
C. Open or close coupled
D. Horizontal or vertical
[多项选择]Which of the following characteristics describe the BPDU Guard feature()
A. ABPDU Guard port should only be configured on ports with PortFast enabled.
B. BPDU Guard and PortFast should not be enabled on the same port.
C. BPDU Guard is used to ensure that superior BPDUs are not received on a switch port.
D. ABPDU Guard port receiving a BPDU will go into err-disablestate.
E. ABPDU Guard port receiving a BPDU will be disabled.
F. BPDU Guard can be enabled on any switch port.
[单项选择]A centrifugal pump may fail to deliver water when first started if the ().
A. water seal pipe is plugged
B. pump is not primed
C. seal ring is improperly located
D. impeller is flooded

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