單項(xiàng)選擇題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


您可能感興趣的試卷

你可能感興趣的試題

1.單項(xiàng)選擇題When paralleled, AC generators must have the same ()

A.frequency
B.number of phases
C.phase rotation
D.All of the above

3.單項(xiàng)選擇題The unit "hertz" is equivalent to ()

A.coulombs per second
B.revolutions per second
C.revolutions per minute
D.cycles per second

4.單項(xiàng)選擇題When paralleling two AC generators, the frequency of the machine coming on-line, immediately prior to closing its breaker, should be ()

A.slightly less than the oncoming generator frequency
B.the same as the bus frequency
C.slightly greater than the bus frequency
D.the same as the bus voltage

5.單項(xiàng)選擇題When two AC generators are being paralleled, the breaker should be closed with the synchroscope pointer mating in the ()

A."slow" direction, just before the 12 o'clock position
B."fast" direction, just after the 12 o'clock position
C."fast" direction, just before the 12 o'clock position
D."slow" direction, just after the 12 o'clock position

最新試題

The additional mark ()in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

題型:?jiǎn)雾?xiàng)選擇題

Diesel engine air start system check valves are opened by ()

題型:?jiǎn)雾?xiàng)選擇題

To shut down a diesel engine after it exceeds the set maximum speed,which type of device listed should be used?()

題型:?jiǎn)雾?xiàng)選擇題

()are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.

題型:?jiǎn)雾?xiàng)選擇題

When does auxiliary burner of incinerator put into operation? ()Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish

題型:?jiǎn)雾?xiàng)選擇題

If separating effect is not good, which measure should be taken ()

題型:?jiǎn)雾?xiàng)選擇題

The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the()

題型:?jiǎn)雾?xiàng)選擇題

The condensers located in various stages of a flash evaporator are cooled by()

題型:?jiǎn)雾?xiàng)選擇題

()connectors hold best if a wire is accidentally pulled or a connection becomes loose.

題型:?jiǎn)雾?xiàng)選擇題

To proceed to the assistance of a ship in distress is()

題型:?jiǎn)雾?xiàng)選擇題