更多"The load sharing characteristics of"的相关试题:
[单项选择]The load sharing characteristics of two diesel generator operating in parallel are mostly dependent on their governor （）.
A. load limit settings
B. idle speed settings
C. speed limit settings
D. speed droop settings
[单项选择]The division of kilowatt load between two paralleled alternators is determined by the （）
A. amount of field excitation of the leading machine
B. load-speed characteristics of the governors
C. amount of field excitation to the lagging machine
D. type of alternator
[单项选择]The load between two steam-driven alternators operating in parallel may be adjusted by varying （）
A. the speed of the alternators
B. the field strength of the machines
C. the power factor of the alternators
D. steam supply to the prime movers
[单项选择]Load control on a diesel engine is accomplished by （）.
A. regulating the speed of the turbocharger
B. rotating the fuel injector pump plunger
C. regulating the speed of the fuel oil transfer pump
D. changing engine timing
[单项选择]The two strokes of a two-stroke/cycle diesel engine are （）
A. power and intake
B. intake and exhaust
C. exhaust and compression
D. compression and power
[单项选择]The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the （）.
A. voltage regulators
B. field rheostats
C. reverse power relays
D. prime mover governors
[单项选择]Which bearing will carry the load on two small points diametrically opposite to each other?（）
A. Needle
B. Tapered roller
C. Roller
D. Ball
[单项选择]（）diesel engines generally have two systems of lubrication:（）a total loss system feeding and a circulating system lubricating the running gear and cooling the pistons.
A. Large crosshead type；crossheads
B. High speed；the cylinders
C. Large crosshead type；the cylinders
D. Four-stroke；pistons and cylinders
[单项选择]An increase in load on a diesel engine results in （） of speed of the crankshaft.
A. a reduction
B. an increase
C. an outing
D. a downwards
[单项选择]A reduction in load on a diesel engine results in （） of speed of the crankshaft.
A. a reduction
B. an increase
C. an outing
D. a downwards
[单项选择]An increase in the load on a turbocharged diesel engine operating at constant speed will result in an increase in （）
A. exhaust
B. air box pressure
C. brake main effective pressure
D. all of the above
[单项选择]When a diesel engine is operate at partial load, as compared to full load ,a decrease will occur in the average （）
A. air quantity aspirated
B. fuel injection pressure
C. combustion pressure on the power stroke
D. compression on the compression stroke
[单项选择]A diesel engine should not be operated at low loads for long periods of time because（）
A. heavy carbon deposits will buildup on the valves and in the exhaust
B. fuel dilution is increased at low load
C. exhaust valves may be damaged
D. all of the above
[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]
A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （）
(1) scavenging air is cooling the exhaust gases
(2) exhaust cycle time is longer
A. (1) only
B. (2) only
C. both (1) and (2)
D. neither (1) nor (2)
[单项选择]In the two stroke diesel engine, it is designed so that the oil impingement is timed to proceed only on the piston ring belt during（）
A. compression stroke
B. suction stroke
C. expansion stroke
D. exhaust stroke
[单项选择]Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to （）
A. increase the liner area covered by the oil film
B. maintain an oil film on the lower liner where scuffing is prevalent
C. keep excess oil away from intake and exhaust ports
D. help cushion piston skirt side thrust by providing a hydrodynamic oil wedge
[单项选择]A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）
A. has little or no internal friction
B. has a lower effective compression ratio
C. operates with scavenge air under a positive pressure
D. operates without energy absorbing intake and exhaust strokes
