Добавил:
Upload Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз: Предмет: Файл:
offer8.docx
Скачиваний:
3
Добавлен:
01.07.2025
Размер:
1 Мб
Скачать
☆

In an axial compressor, a stage consists of a/an:

A - Seal and a fixed blade row B - Impeller shaft and a stator C - Pair of moving and fixed blade rows D - Set of intake and a discharge valves Correct Answer(s): C Question 3:

Axial compressor casings are made of:

A - Steel B - Galvanized steel C - Wrought iron D - Aluminum Correct Answer(s): A Question 4: In an axial compressor, each pair of moving and fixed blade rows constitutes:

A - A stage B - A pressure reduction C - An impeller shaft D - A seal Correct Answer(s): A Question 5: Centrifugal compressors have the disadvantage of:

A - Having high maintenance requirements B - Not being well suited for low capacity work C - Being mechanically complex D - Requiring internal lubrication Correct Answer(s): B Question 6:

In an axial compressor, the shortest blades on the stator are located:

A - On the upper casing of the unit B - At the inlet end of the unit C - At the outlet end of the unit D - At the middle of the unit Correct Answer(s): C Question 7:

Elevating the output pressures of centrifugal compressors by multi-staging means that:

A - A low-pressure compressor discharges into the suction of a high-pressure compressor B - The gas is compressed in steps as it passes progressively through several impellers mounted on a common shaft C - Several sets of diffusers are placed at the outlet of a single impeller D - The diffuser vanes are placed at both the inlet and outlet of an impeller Correct Answer(s): B Question 8:

Compared to centrifugal compressors, to achieve given pressure differentials, axial compressors require:

A - Lower volumes B - Higher temperatures C - More stages D - Fewer stages Correct Answer(s): C Question 9: In an axial compressor, the longest blades on the stator are located at the:

A - Casing B - Middle C - Outlet end D - Inlet end Correct Answer(s): D Question 10:

Two-stage centrifugal compressors are commonly used in:

A - Large volume, high pressure applications B - Low volume, low pressure applications C - Low volume, high pressure applications D - Large volume, low pressure applications Correct Answer(s): D Question 1:

Centrifugal compressors have the disadvantage of:

A - Being mechanically complex B - Requiring internal lubrication C - Not being well suited for low capacity work D - Having high maintenance requirements Correct Answer(s): C

Question 2:

In a centrifugal compressor, the diffuser vanes work to:

A - Reverse the direction of flow as the gas leaves the impeller, reducing the pressure B - Increase gas pressure between the impeller outlet and the volute casing C - Accelerate the flow of gas into the eye of the impeller D - Increase gas pressure just before it leaves the volute casing of the compressor Correct Answer(s): B Question 3:

Centrifugal compressors have the advantage of:

A - Having a higher efficiency compared to positive displacement compressors B - Being simple and rugged in construction C - Requiring internal lubrication D - Being well suited for low capacity work Correct Answer(s): B Question 4:

If you were setting up an axial compressor that was driven by an internal combustion engine, what would you need to add for the compressor to perform to design?

A - Additional stages B - A higher torque camshaft C - Speed-reducing gears D - Speed-increasing gears Correct Answer(s): D Question 5:

In an axial compressor, a stage consists of a/an:

A - Pair of moving and fixed blade rows B - Set of intake and a discharge valves C - Seal and a fixed blade row D - Impeller shaft and a stator Correct Answer(s): A Question 6:

In an axial compressor, each pair of moving and fixed blade rows constitutes:

A - A seal B - A pressure reduction C - An impeller shaft D - A stage Correct Answer(s): D Question 7:

The thrust that is produced on the rotor of an axial compressor:

A - Is balanced by the shape of the blades B - Results in a force that tends to push the rotor toward the discharge end C - Is an insignificant factor in compressor design D - Can be overcome by installing a dummy piston on the compressor shaft Correct Answer(s): D Question 8:

Axial compressor casings are made of:

A - Galvanized steel B - Wrought iron C - Aluminum D - Steel Correct Answer(s): D Question 9:

Соседние файлы в предмете [НЕСОРТИРОВАННОЕ]