更多"A faulty thermostatic bypass valve,"的相关试题:
[单项选择]The bypass valve on a self-contained breathing device should be opened if（）.
A. you are entering a space containing poisonous vapors
B. you are entering a space containing explosive gases
C. the regulator of the breathing apparatus malfunctions
D. the face piece of the breathing device is too tight
[单项选择]The function of the bypass valve on the self-contained breathing apparatus is to（）.
A. control the pressure of the oxygen as it enters the body
B. allow the wearer to manually give himself oxygen
C. release excess heat which would otherwise cause the bottle to explode
D. allow exhaled gases to pass outside the bottle
[单项选择]Diesel engine valve springs function to （）
A. hold the valves open
B. keep the valves off their seats until the exhaust stroke is completed
C. close the valves
D. open inlet valves when the air injection cycle begins
[单项选择]The diesel engine valve subjected to most severe conditions of service is the （）.
A. cylinder exhaust valve
B. air starting valve
C. air inlet valve
D. cylinder relief valve
[单项选择]Worn diesel engine intake valve guides can result in （）
A. increased engine breathing efficiency
B. excessive valve lash
C. excessive lube oil consumption
D. lower than normal fuel consumption
[单项选择]White smoke exhausting from an operating diesel engine may indicate （）
A. a cracked liner
B. burning lube oil
C. an overloaded engine
D. insufficient combustion air
[单项选择]Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）
A. water in the fuel
B. insufficient fuel for combustion
C. clogged air intake passages
D. burning lubricating oil
[单项选择]Persistent knocking in one cylinder of a diesel engine could be caused by（）.
A. a low load on that cylinder
B. sluggish piston ring action
C. excessive piston crown cooling
D. excessive clearance of piston pin
[单项选择]According to the principle of two stroke diesel engine, what is the number of its efficient work stroke per revolution?（）
A. 1/2
B. 1
C. 2
D. 3
[单项选择]Water accumulating in the crankcase of a diesel engine could indicate（）
A. a cracked cylinder liner
B. excessive water in the fuel
C. a leaking intercooler
D. excessive moisture in the scavenge air
[单项选择]Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will（）
A. increase engine power
B. increase engine load
C. decrease engine power
D. improve fuel economy
[单项选择]What occurs in the combustion space of a diesel engine cylinder shortly after ignition and before the piston reaches TDC?（）
A. Rapid increase in temperature with constant pressure
B. Rapid increase in pressure with constant temperature
C. Rapid increase in pressure and temperature
D. Rapid increase in volume and decrease in pressure
[单项选择]In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the （）.
A. lube oil pump suction line
B. lube oil pump discharge line
C. bottom of the lube oil sump
D. outlet from the lube oil header
[单项选择]If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the （）.
A. cylinder compression pressure may not be high enough
B. cylinder compression temperature may be too high
C. fuel oil injection pressure may not be high enough
D. scavenge and purge process is incomplete
[单项选择]Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of （）
A. low loading of that cylinder
B. faulty combustion in that cylinder
C. sluggish piston ring action
D. excessive piston cooling
[单项选择]The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）
A. prevent engine back pressure at heavy loads
B. increase total engine efficiency at low loads
C. prevent boiler corrosion at low engine loads
D. improve engine fuel consumption at any load
[单项选择]Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）
A. increase back pressure during the exhaust process
B. facilitate periodic replacement of the valves
C. reduce the pumping loss associated with scavenging
D. reduce tension on valve springs
