A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame
您可能感兴趣的试卷
你可能感兴趣的试题
A.low water level
B.low oil pressure
C.excessively high fuel pressure
D.an improper air/fuel ratio
A.Reciprocating pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump
A.discharge is continuous
B.it has no internal valves
C.upon accidental closing of discharge valve, excessive pressure will not build up
D.all of the above are true
A.between the suction and discharge
B.below the liquid supply
C.above the liquid supply
D.any of the above
Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? ()
(1) reciprocating
(2) vane
(3) gear
A.(1)only
B.(1)and(2)
C.(1),(2)and(3)
D.(2)and(3)
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
A.(1)only
B.(1)and(2)
C.(1),(2)and(3)
D.(2)and(3)
A.increased;decreased
B.decreased;increased
C.decreased;decreased
D.increased;increased
A.kg
B.MPa
C.mH20
D.None of the above
Which of the following are components of a mechanical seal? ()
(1) stationary ring
(2) rotational ring
(3) packing
(4)spring
A.(1), (2) and (3)
B.(1), (2) and (4)
C.(2), (3) and (4)
D.None of the above
A.variable stroke pumps
B.multistage pumps
C.positive displacement pumps
D.triple-ported pumps
![](https://static.ppkao.com/ppmg/img/appqrcode.png)
最新试题
The general purpose of a heat exchanger is to ().
The control mode in which the final control element is moved from one of two flexed positions to the other is known as ().
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be ().
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its ().
Which of the following statements is correct concerning heat transfer?()
A salinity indicator is used to determine the ().
A pressure drop through the refrigerant liquid line may cause ().
A grease gun is generally used to lubricate a ().
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of ().
The output volume of a positive fixed displacement pump can be changed only by ().