更多"During working, thermostatic expans"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]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]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
[单项选择]A cracked diaphragm in a thermostatic expansion valve will cause the valve to （）.
A. return to a neutral position
B. flood the evaporator
C. open
D. close
[单项选择]During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）
A. effective cylinder scavenging and cooling
B. constant pressure from the turbochargers
C. cooler operation of the exhaust system
D. effective constant pressure for turbocharger operation
[单项选择]Valve overlap is the period during which （）.
A. the inlet valve is open
B. the exhaust valve is open
C. both valves are closed
D. both valves are open
[单项选择]During the dock repair, each sea valve must be disassembled, cleaned and ground well.Before it reassemble the sealing surface between the valve and the valve seat should be checked by （）
A. chief engineer
B. surveyor
C. the engineer
D. the technique personnel of the shipyard
[单项选择]She has been working hard day and night during these years（）she could pay for the lost necklace.
A. in order that
B. as long as
C. the moment
D. because
[单项选择]During working of an air compressor, （） should be drained.
A. inter cooler
B. cylinder
C. outlet pipe
D. inlet pipe
[单项选择]During working, when the piston is near the （）, the air ignites the fine spray of fuel.
A. TDC
B. DTC
C. BDC
D. BCD
[单项选择]The operating cord on an inflatable liferaft should be renewed by（）.
A. removing the top half of the shell，cutting the line at its source，and renewing completely
B. cutting the line where it enters the case and replacing that portion
C. leaving the original line and tying another one to it so the two lines will take the strain
D. an approved servicing facility ashore
[单项选择]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）
A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time
[单项选择]Before using or operating any equipment, you should first （） its manual thoroughly and understand its contents（）.
A. read/sufficient
B. consult/sufficiently
C. read/sufficiently
D. consult/sufficient
[单项选择]Which lashing gear used aboard Ro-Ro vessels should be painted or soaked in oil when not in use（）.
A. Chain
B. Wire rope
C. Webbing
D. All of the above
