更多"A centrifugal pump attempting to de"的相关试题:
[单项选择]A centrifugal pump produces flow with a resulting discharge head by energy conversionIt is typical for the energy conversion to follow the order of （）.
A. mechanical energy to kinetic energy to potential energy
B. mechanical energy to potential energy to kinetic energy
C. potential energy to mechanical energy to kinetic energy
D. kinetic energy to mechanical energy to potential energy
[单项选择]A mixed-flow pump is a （） pump classified by the working principle.
A. self priming
B. positive displacement
C. reciprocating
D. impeller
[单项选择]Because the flow rate of supply water pump is too large, oily water separator does not work wellWhich of the following is not the reason?（）
A. the monitoring equipment is out of order
B. separating effect becomes bad
C. inner wall is contaminated
D. separating effect becomes bad and inner wall is contaminated
[单项选择]The discharge flow of a reciprocating pump is （）.
A. steady
B. in pulsation
C. continuous
D. large
[单项选择]Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.
A. filled
B. evacuated
C. compressed
D. charged
[单项选择]If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilges, you would check for all of the following EXCEPT （）.
A. the circuit breaker
B. for leaks in the suction piping
C. relief valve is not properly seated
D. the suction strainer
[单项选择]Shall we request the chairman（）our suggestion again?
A. toconsider
B. considering
C. consider
D. considered
[单项选择]（） are mounted in pairs to protect the boiler against overpressure.
A. Safety valves
B. Water tubes
C. Steam stop valves
D. Blow down valves
[单项选择]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
[单项选择]Which pump is the self-priming pump?（）
A. turbine
B. centrifugal
C. ejector
D. mixed flow
[单项选择]The （）pump is usually used as the bilge feed pump to an oily water separator.
A. turbine
B. screw
C. vane
D. ejector
[单项选择]A （） pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out.
A. injector
B. positive displacement
C. centrifugal
D. centripetal
[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 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]Fuel pump index is （）.
A. the viscosity index
B. the fuel oil contents
C. the starting speed
D. the reading at the rack
[单项选择]Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.
A. one size smaller than the pump suction nozzle
B. the same size as the pump suction nozzle
C. one size larger than the pump suction nozzle
D. installed with a short radius elbow at the pump
[单项选择]Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.
A. one size larger than the pump discharge nozzle
B. the same size as the pump discharge nozzle
C. one size smaller than the pump discharge nozzle
D. installed with a short radius elbow at the pump
[单项选择]A centrifugal pump vibrates excessively during operationUpon disassembling the pump it is found that the impeller is out of balanceWithout an available spare, you should （）.
A. drill holes through the heavy side of the impeller until it balances
B. weld counterweights to the light side of the impeller
C. remove metal from the heavy side by machining in a lathe
D. acid wash and serape the heavy side until it balances
