更多"The rotor of the hydraulic motor ro"的相关试题:
[单项选择]The （）, cage rotor induction motor is the first choice marine motor in most modern ships because of its electrical and mechanical simplicity.
A. single phase
B. two phase
C. three phase
D. four phase
[单项选择]To protect the rotor of a motor disassembled for maintenance or overhaul, it should be（）
A. suspended by wire slings in one comer of the shop
B. wrapped in several layers of heavy paper or carboard
C. supported by flat wood blocks on the workbench
D. returned to the frame as soon as the bearings are removed
[单项选择]A hydraulic motor may be driven by （）.
A. an electric motor
B. a diesel engine
C. a compressor
D. oil
[单项选择]If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably（）.
A. excessive pump speed
B. excessive suction head
C. worn wearing rings
D. gross pump misalignment
[单项选择]The police will give you a ticket if you（）the speed limit.
A. break
B. reject
C. suspend
D. exceed
[单项选择]If one hydraulic pump of an electro-hydraulic steering unit falls, the vessels steering can be initially and best maintained by using the （）.
A. trick wheel
B. accumulator
C. standby pump
D. telemotor
[单项选择]If a diesel engine rotates slowly when cranked, but does not fire, the（）
A. fuel control rack had admitted excessive fuel
B. engine speed does not match the fuel rack setting
C. engine has failed to reach its firing speed
D. starter pinion and ring gear contact is not correct
[单项选择]The hot expanding gas rotates the blades of the exhaust turbine, thus giving out large part of its power, which drives （）.
A. the oil separator
B. the fresh water generator
C. the compressor
D. fire pump
[单项选择]In a four-stroke engines the camshaft rotates at （）.
A. half the engine rotational speed
B. twice the engine rotational speed
C. the engine rotational speed
D. four times the engine rotational speed
[单项选择]If a line at right angles to the axis rotates about that axis and, at the same time, moves parallel to the axis, it will generate （）.
A. a helix
B. a helicoidal
C. a curve
D. a cone
[单项选择]When a point rotates about an axis and, at the same time, moves parallel to that axis, it describes （）.
A. a line
B. a circle
C. a helix
D. an epllicate
[单项选择]In a four-stroke engine the camshaft rotates at （）.
A. half the engine speed
B. twice the engine speed
C. the engine speed
D. four times the engine speed
[单项选择]If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two-stroke/cycle diesel engine will develop approximately（）
A. the same indicated horsepower as a four-stroke/cycle engine
B. twice the indicated horsepower as a four-stroke/cycle engine
C. one half indicated horsepower as a four-stroke/cycle engine
D. one power stroke for every two crankshaft revolutions
[单项选择]External and internal leakage in hydraulic systems may be caused by （）.
A. unusual vibration
B. excessive worn parts
C. abnormal pressure
D. any of the above
[单项选择]The most common contaminate of governor hydraulic fluid is （）.
A. moisture
B. dirt
C. acid
D. air
[单项选择]Hydraulic machinery failures are commonly caused by misalignment of the system components and by （）.
A. hydraulic fluid contamination
B. excessive fluid friction
C. turbulent fluid flow
D. fluid pressure surges
[单项选择]A variable displacement system of hydraulic drives consists of （）.
A. a variable displacement axial piston pump
B. a constant displacement axial piston pump
C. a reciprocating piston pump
D. a centrifugal pump
