更多"An after-cooler installed between t"的相关试题:
[单项选择]The function of the after-cooler installed between the turbocharger and intake manifold on some diesel engine, is to （）
A. increase the density of the intake air
B. decrease turbocharger power usage
C. reduce exhaust gas temperature
D. compensate for turbocharger PRM fluctuations
[单项选择]If the turbocharger failed on an auxiliary diesel engine, which of the following conditions would probably occur?（）
A. Full power cannot be developed
B. The exhaust will contain black smoke
C. Complete combustion will be impossible
D. All of the above
[单项选择]Intake air flow from a diesel engine turbocharger is directly proportional to engine（）
A. exhaust gas pressure
B. exhaust gas temperature
C. speed
D. load
[单项选择]The operating speed of a turbocharger is directly dependent upon（）
A. engine speed
B. engine load
C. intake manifold pressure
D. atmospheric pressure
[单项选择]If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should（）
A. check the air filter for obstruction
B. check for an exhaust leak
C. check the exhaust temperature
D. secure the engine
[单项选择]Why will a turbocharger diesel engine produce black smoke if excessive additional load is applied too quickly?（）
A. Exhaust energy would draw excess air
B. The inertia of the turbocharger rotor causes a time lag which delays the turbocharger speed increase
C. Exhaust gas pumping losses are increased due to turbine windage
D. Exhaust gas back pressure falls slightly due to increased nozzle action
[单项选择]Leaking oil seals on a diesel engine turbocharger can cause（）
A. the engine to run after the fuel has been secured
B. the engine to over-speed
C. a fire
D. all of the above
[单项选择]
Continuous surging of turbocharger can be caused by（）
①crash stop of engine
②increased back pressure after T-Ch
③fouled or damaged turbine nozzle ring
A. all are correct
B. ②and③are correct
C. none of the above is correct
D. ①only is correct
[单项选择]In a turbocharger, inlet air velocity is increased in the（）.
A. inlet nozzle ring
B. stationary diffuser passages
C. compressor outlet volute
D. rotating impeller vanes
[单项选择]Following the failure of one turbocharger on a large, crosshead, main propulsion diesel engine, fitted with multiple turbochargers, which of the following actions should be taken prior to further operation of the engine? （）
A. Blank off the exhaust gas inlet to the damaged turbocharger
B. Secure cooling and lubrication to the damaged turbocharger
C. Lock the rotor of the damaged turbocharger
D. All of the above
[单项选择]When used in conjunction with a turbocharger, the main function of an after-cooler is to （）
A. increase the density of the cylinder air charge
B. prevent turbocharger overheating
C. liminate the need for a pre-cooler
D. remove moisture from air compressed by the turbocharger
[单项选择]If the turbocharger of a four-stroke/cycle diesel engine fails to operate, which of the following statements best describes the probable effect?（）
A. Intake manifold pressure will be high
B. Intake manifold pressure will be unaffected
C. Exhaust temperatures will be high
D. Exhaust temperatures will be low
[单项选择]The speed of the turbocharger for a four-stroke/cycle diesel engine driving a generator at constant speed depends on the （）
A. engine speed
B. kilowatt load
C. fuel injection pressure
D. air intake manifold temperature
[单项选择]
A few spots of turbocharger can be caused by（）
①crash stop of engine
② rapid increased of engine speed
A. ①only is correct
B. ②only is correct
C. both ① and ②are correct
D. neither ① or ② correct
[单项选择]Intercoolers installed on starting air compressors, reduce the possibility of（）
A. dust entering the high pressure stage
B. lube oil carbonization
C. discharge pulsations
D. inter-stage vapor lock
[单项选择]Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.
A. cooling water pump
B. nozzle cooling passages
C. cylinder jackets
D. heat exchanger
[单项选择]The circular steel structure installed around the propeller of a towboat is the（）.
A. nozzle
B. shroud
C. strut
D. hood
[单项选择]Why are removable sleeves installed on centrifugal pump shafts?（）
A. They make it easier to replace the pump shaft packing
B. They can be economically replaced as they wear out
C. They can be removed when it is necessary to lighten the weight of the pump
D. They increase the strength of the shaft
[单项选择]A system administrator installed a new switch using a script to configure it. IP connectivity was tested using pings to SwitchB.Later attempts to access NewSwitch using Telnet from SwitchA faileD.Which statement is true?（）
A. Executing password recovery is required.
B. The virtual terminal lines are misconfigured.
C. Use Telnet to connect to RouterA and then to NewSwitch to correct the error.
D. Power cycle of NewSwitch will return it to a default configuration.
