4Th Class Power Engineering Chapter 75

Front 1

Intercoolers:

1) Cool the air at the inlet valves

2) Must have a safety valve when used on positive displacement

3) Are used on all compressors

4) Are required to cool compressor-lubricating oil

5) Cool the air in the cylinders

Back 1

Must have a safety valve when used on positive displacement

Front 2

An air compressor auxiliary which will decrease the power requirement is the:

1) Receiver

2) Variable compression ratio read

3) Aftercooler

4) Diffuser

5) Intercooler

Back 2

Intercooler

Front 3

The valves on a reciprocating compressor are opened by:

1) A pressure difference

2) The eccentric

3) The camshaft

4) A timing gear

5) Hydraulic pressure

Back 3

A pressure difference

Front 4

Sliding vane compressors:

1) Are 100% efficient

2) Are double acting compressors

3) Use cylinder valves

4) Are positive displacement compressors

5) Fall into the centrifugal compressor category

Back 4

Are positive displacement compressors

Front 5

In a centrifugal compressor the kinetic energy is converted to potential energy in the:

1) Diffuser only

2) Compressor cavity

3) Volute, diffuser or both

4) Intercooler

5) Volute only

Back 5

Volute, diffuser or both

Front 6

A belt driven lubricator is very popular on a:

1) Sliding vane unit

2) Rotary lobe unit

3) Reciprocating double acting unit

4) Centrifugal unit

5) Screw unit

Back 6

Sliding vane unit

Front 7

Compressor unloaders:

1) Must be used on centrifugal compressors

2) Are located on the driver of the compressor

3) Could keep the suction valves open

4) Could close the discharge valves

5) Activate the stop and start button

Back 7

Could keep the suction valves open

Front 8

The compressor which would favor volume over pressure would be the:

1) Screw

2) Sliding vane

3) Centrifugal

4) Rotary lobe

5) Axial

Back 8

Centrifugal