A.The relief valves in the system should be readjusted
B.The filters and strainers should be checked frequently
C.All system pressure should be readjusted
D.The system should be drained and renewed with a fluid of different operating characteristics
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A.100℃
B.125℃
C.150℃
D.175℃
A.maintain radial alignment between the pump impeller and casing
B.absorb all impeller shaft end thrust
C.prevent water leakage to the atmosphere
D.prevent wear of the pump casing and/or impeller
A.psychrometer
B.salinometer
C.anemometer
D.sphygmomanometer
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
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A salinity indicator is used to determine the ().
Thermostatic expansion valves can be adjusted for ().
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is ().
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().
One cause of high head pressure occurring in a refrigeration system can be ().
When the steering gear is in operation, you should ().
The usual symptoms of cavitation in a centrifugal pump is ().
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should ().
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().