更多"A three-way thermostatic control va"的相关试题:
[单项选择]A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.
A. evaporator pressure decrease
B. evaporator coil over-feed
C. evaporator capacity increase
D. expansion valve diaphragm rupture
[单项选择]Thermostatic expansion valve are （）.
A. either all the way open or all the way closed
B. normally open
C. throttled depending on load
D. controlled by suction pressure
[单项选择]During working, thermostatic expansion valve should be （）.
A. either all the way open or all the way closed
B. normally fully open
C. throttled depending on load
D. controlled by liquefied pressure
[单项选择]A faulty thermostatic bypass valve, in a diesel engine cooling system, can result in （）
A. excessive time required for warming-up
B. excessive freshwater corrosion
C. scale formation on the saltwater side
D. saltwater mixing with the freshwater
[单项选择]When you adjust a thermostatic expansion valve, （）.
A. refrigerant must be bled off the sensing line before adjustments are made
B. all refrigerant must be pumped into the receiver before adjustments are made
C. time must be allowed for conditions to stabilize in the evaporator before further adjustments are made
D. all refrigerant must be routed through the dehydrator while changing the superheat setting
[单项选择]Upon the survey it is found the deck control valve of the fore peak tank could not be（）.
A. tighted formally
B. shut tightly
C. combined properly
D. closed suitably
[单项选择]The deck control valve to be（）after being repaired.
A. moved and fitting again
B. removed and refitted
C. reproduced and put on again
D. return and attached again
[单项选择]If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）
A. a low level in the engine expansion tank
B. excessively high coolant pressure
C. improper temperatures
D. malfunctioning of the jacket water heater
[单项选择]The thermostatic valve has a throttling action, that is to say the valve can（）
A. stop the refrigerant from flowing
B. force the refrigerant to flow
C. cause the refrigerant pressure to rise
D. cause the refrigerant pressure to fall
[单项选择]Operation of the valve control release on a fixed CO2 system must immediately（）.
A. release CO2 to the protected space
B. secure all mechanical ventilation in the protected space
C. sound the rig's general alarm signal for a fire
D. sound an alarm in the ballast control room
[单项选择]A fuel injection valve opening at pressure lower than normal will result in（）.
A. late fuel injection
B. early fuel injection
C. high exhaust temperature from that cylinder
D. decreased effective stroke from that injector
[单项选择]A lower thermostatic temperature setting will provide a desired degree of comfort in a room where （）
A. low relative humidity is maintained
B. triple banded squirrel cage fans are used
C. air circulation is a maximum
D. high relative humidity is maintained
[单项选择]Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
A. double bottom fuel oil tank temperature
B. heater supply steam flow
C. pressure of the fuel supplied to the burners
D. attemperator steam flow in the heater discharge circuit
[单项选择]Thermostatic expansion valves can be adjusted for （）.
A. suction pressure only
B. head pressure only
C. superheat only
D. suction pressure and box temperature
[单项选择]A ruptured diaphragm in a thermostatic expansion valve will cause the valve to （）.
A. open
B. close
C. remain in its position
D. flood the evaporator with refrigerant
[单项选择]What is the function of thermostatic expansion valve in a compression refrigeration system?（）
A. nonexistent
B. for controlling pressure
C. for controlling superheat
D. for controlling the solenoid valve
