單項(xiàng)選擇題Which of the following statements is correct regarding an oil with a high viscosity index?()

A.A large change of viscosity occurs with a minor change in temperature
B.No change in viscosity occurs with any change in temperature
C.Very little change in viscosity occurs with a significant change in temperature
D.The viscosity of the oil increases with an increase in temperature


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1.單項(xiàng)選擇題If you were operating a centrifugal water service pump with worn wearing rings, the ().

A.pump would be very noisy
B.pump would vibrate excessively
C.pump would develop insufficient flow
D.stuffing box would leak excessively

2.單項(xiàng)選擇題The packing installed in the pump stuffing box is lubricated by ().

A.gravity and feed oil cups
B.grease cups
C.hand during installation
D.leakage through the stuffing box

3.單項(xiàng)選擇題The steam coils in a high pressure evaporator used for saltwater service should be de-scaled with ().

A.a needle gun
B.soap and water
C.a wire brush
D.a chipping hammer

4.單項(xiàng)選擇題Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?()

A.Hydrochloric acid
B.Chlorine
C.Sulfuric acid
D.Zinc chromate