更多"Hydraulic machinery failures are co"的相关试题:
[单项选择]Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and （）.
A. fluid friction
B. fluid turbulence
C. component misalignment
D. pressure surges
[单项选择]Advection fog is most commonly caused by（）.
A. air being warmed above the dew point
B. saturation of cold air by rain
C. a rapid cooling of the air near the surface of the Earth at night
D. warm moist air being blown over a colder surface
[单项选择]Electrical failures in motors are caused by the breakdown of insulation, which may be caused by （）
A. penetration of moisture
B. accumulation of dirt
C. overheating
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]Poor combustion in a diesel engine can be caused by （）.
A. high compression pressure
B. low intake air temperature
C. low exhaust pressure
D. high scavenge air temperature
[单项选择]Low compression in a diesel engine can be caused by （）
A. clogged coolant passages
B. a leaking cylinder head gasket
C. low fuel oil pressure
D. worn or broken cylinder liner sealing rings
[单项选择]Which of the listed failures, occurring in an automated diesel generator system, should cause an audible alarm at the engine room control station?（）
A. Low cooling water outlet temperature
B. High lube oil pressure
C. Low lube oil temperature
D. Low starting air pressure
[多项选择]Which two data intergrity algorithms are commonly used in VPN solutions?（）
A. HMAC-MD5
B. RSA
C. HMAC-SHA-1
D. DH1
E. DH2
[单项选择]Pyrometers commonly found on diesel engine exhaust systems, consist of（）
A. pyrostats and a voltmeter
B. a gas-filled bellows, a tube and a pressure gauge
C. thermocouples and a voltmeter
D. ammeters and thermocouples
[单项选择]Hydraulic pumps most commonly used in steering systems are of the （）.
A. lobe type
B. screw type
C. axial piston type
D. volute type
[单项选择]Stainless steel is material commonly used for temperatures up to 50℃; beyond that and for severe corrosive conditions other materials are requiredThe bold and italic word “that” probably means （）.
A. stainless steel
B. temperature
C. 50℃
D. other materials
[单项选择]The device that most commonly utilizes the principle of electromagnetic induction is the（）.
A. diode
B. transformer
C. transistor
D. rheostat
[单项选择]Strainers are commonly used in hydraulic systems to （）.
A. protect the pump from fine soluble contaminants
B. prevent solid particles from entering the pump
C. prevent solid particles from entering the filter
D. protect the directional control valves
[单项选择]MIST is caused by（）.
A. forest fires
B. smoke from industrial areas
C. dust or sand storms
D. water droplets with the relative humidity more than 95%
[单项选择]Disastrous explosions have been caused by accumulations of oil or oil vapour in air lines not drainedAccording to the above sentence, which of the following statements is true?（）
A. Oil vapour in air piping are dangerous
B. Explosion will cause oil vapouring in air lines
C. Oil vapour in air piping should be drained
D. Oil in air piping should not be drained
[单项选择]Deviation is caused by（）.
A. changes in the earth's magnetic field
B. nearby magnetic land masses or mineral deposits
C. magnetic influence inherent to that particular vessel
D. the magnetic lines of force not coinciding with the lines of longitude
