A.psychrometer
B.salinometer
C.anemometer
D.sphygmomanometer
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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
A.pump would be very noisy
B.pump would vibrate excessively
C.pump would develop insufficient flow
D.stuffing box would leak excessively
A.gravity and feed oil cups
B.grease cups
C.hand during installation
D.leakage through the stuffing box
A.a needle gun
B.soap and water
C.a wire brush
D.a chipping hammer
A.Hydrochloric acid
B.Chlorine
C.Sulfuric acid
D.Zinc chromate
最新試題
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）
The usual symptoms of cavitation in a centrifugal pump is （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
A pressure drop through the refrigerant liquid line may cause （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.