更多"A centrifugal pump vibrates excessi"的相关试题:
[单项选择]The plunger in the fuel injector pump, usually operated by a (), is driven up and down when working.
A. crankshaft
B. camshaft
C. piston rod
D. rack and pinion
[单项选择]If a centrifugal pump vibrates and is noisy when operating, the cause could be ().
A. worn gland sealing shaft
B. worn wearing rings
C. a bent shaft
D. reversed pump coupling
[单项选择]During bunkering, the request for stoppage of pumping shall be made, as a rule, 5 minutes ().
A. ago
B. before
C. ahead
D. front
[单项选择]An overcorrecting and unstable engine governor operation is known as().
A. droop
B. dead banding
C. dash potting
D. hunting
[单项选择]Which pump is the self-priming pump?()
A. turbine
B. centrifugal
C. ejector
D. mixed flow
[单项选择]An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? ()
A. Open-faced diamond
B. Diamond with a cross
C. Circle
D. Rectangle
[单项选择]A mixed-flow pump is a () pump classified by the working principle.
A. self priming
B. positive displacement
C. reciprocating
D. impeller
[单项选择]A portable foam fire extinguisher is placed in operation by()
A. turning it upside down
B. pressing the foam lever
C. squeezing the grip handle
D. opening the hose valve
[单项选择]Which of the terms listed below represents the operational speed at which excessive engine vibration is created?()
A. Non-harmonic speed
B. Critical speed
C. Maximum speed
D. Design maximum speed
[单项选择]Which of the conditions listed may occur in an operating diesel engine if air pockets form within the cylinder head circulating water passages? ()
A. Hydraulic stress and distortion will develop
B. Hot spots will develop
C. Fuel oil viscosity will increased
D. An increase in trapped deposits of scale and dirt
[单项选择]The term () refers to one complete sequence of operations required to produce power in an engine.
A. diesel engine
B. stroke
C. cycle
D. compression ratio
[多项选择]200H车载设备VC单元OPE8-6A的作用()。
A. 接收速度信号
B. 接收轨道电路信息
C. 进行速度比较
D. 设备整体的故障检测
[单项选择]A () pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out.
A. injector
B. positive displacement
C. centrifugal
D. centripetal
[单项选择]Start the turning gear, and with some one hand-operating the cylinder lubricators at regular intervals, and with the indicator cocks (), and with the control gear in the ()position, give the engine at least one complete turn.
A. open;“stop”
B. closed;“stop”
C. open;“start”
D. closed;“start”
[多项选择]SNMPv3 authorizes management operations only by configured users and encrypts SNMP messages. Which authentication protocols does Cisco NX-OS Software use for SNMPv3?()
A. NMAC-SHA-96 authentication protocol
B. HMAC-MD5-96 authentication protocol
C. Community String Match protocol
D. NMAC-MD5-96 authentication protocol
E. HMAC-SHA-96 authentication protocol
[单项选择]Which conditions will normally cause a SART to operate in the active mode?()
A. It will respond only to interrogation by 9-Ghz radar signals
B. A SART will normally respond to interrogation from a searching vessel's radar if the radar antenna is at least 15 meters high
C. A SART will normally respond to interrogation from a searching aircraft's radar if the radar's output power is at least 10,000 watts and the aircraft is at a height of 3000 feet and within 30 nautical miles
D. All of the above
[单项选择]The crankcase cover should never be allowed to open for investigation when ()
A. the engine stops
B. the engine is running
C. you repair the engine
D. overhauling the engine
[单项选择]When ship navigating in rough sea, the correct operation is ()
A. navigating with a low diesel engine speed
B. navigating with a stable diesel engine speed
C. increasing the efficiency of propeller
D. increasing fuel injection
[单项选择]The ()pump is usually used as the bilge feed pump to an oily water separator.
A. turbine
B. screw
C. vane
D. ejector