更多"The projection on a shaft designed "的相关试题:
[单项选择]Under normal conditions, the quantity of air circulation becomes less and less.What is the reason?（）
A. dirty delivery ducts
B. too much refrigerant
C. the fouling filters
D. high temperature outside
[单项选择]Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
A. a high suction head
B. rotating rings
C. badly worn bearings
D. a loose stuffing box gland
[单项选择]Air cocks, usually positioned at the （） in a circulating system, is used to get rid of the air in the system.
A. bending joint
B. expansion tank
C. weld
D. the highest point
[单项选择]The only cylindrical chart projection widely used for navigation is the （）.
A. Lambert conformal
B. Mercator
C. azimuthal
D. gnomonic
[单项选择]A chart projection depicting the poles and a small area on either side of a connecting meridian，that is sometimes used for star charts，is the（）.
A. Azimuthal gnomonic projection
B. Lambert conformal projection
C. Transverse Mercator projection
D. Polyconic projection
[单项选择]A polyconic projection is based on a （）.
A. plane tangent at one point
B. cylinder tangent at one parallel
C. cone tangent at one parallel
D. series of cones tangent at selected parallels
[单项选择]Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or （）.
A. inside micrometer
B. feeler gauge
C. adjustable trammel
D. sighting device
[单项选择]Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by（）
A. permanent loss of pump suction
B. worn shaft seals
C. high level in the oil sump
D. low motor RPM
[单项选择]Which is not the maintenance work for shaft bearings in transmission system?（）
A. check oil level in bearing sump
B. check them for leakagec through end seals
C. pump bilges in time
D. check temperature
[单项选择]Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by （）.
A. a compressed packing gland
B. lantern tings between the packing rings
C. a liquid seal
D. the stuffing box gland
[单项选择]Shaft sealing in a centrifugal pump can be effected by （）.
A. the mechanical seal
B. packed stuffing boxes
C. either A or B
D. neither A nor B
[单项选择]On opposite ends of a single shaft of a turboblower are a gas driven （）and a air compressor, which are sealed each other.
A. charge air receiver
B. scavenging air belt
C. turbine
D. air cooler
[单项选择]A gnomonic projection is based on a(n)（）.
A. plane tangent at one point
B. cylinder tangent at the equator
C. cone tangent at one parallel
D. infinite series of cones tangent at selected parallels
[单项选择]Where a propeller shaft passes through the hull，water is prevented from entering by means of a（）.
A. stuffing box
B. propeller boss
C. seacock
D. stop-water
