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Induction motors are simple, rugged and reliable, and have no:

A - Moving parts B - Rotating windings C - Limit to the applications for which they may be used D - Bearings requiring lubrication Correct Answer(s): B Question 8:

An engine exhaust temperature controller is affected by:

A - Fuel gas consumption B - Crankcase pressure C - Air-to-fuel ratio D - Lube oil pressure Correct Answer(s): C Question 9: The most widely used compressor driver in the low power range is the:

A - Gas turbine B - Steam turbine C - Synchronous motor D - Squirrel cage induction motor Correct Answer(s): D Question 10: Compressor cylinders operating on bypass may:

A - Heat up B - Cause hydrates to form C - Damage the governor D - Result in warping cylinder parts Correct Answer(s): A

Question 1:

By definition, a dynamic compressor involves:

A - An intermittent flow of a gas from a low velocity to a high-pressure area B - Trapping a set volume of a gas inside a space and then forcing it out at a higher pressure C - The continuous flow of a gas with the conversion of velocity energy into pressure energy D - The continuous flow of a gas into and out of a reciprocating cylinder Correct Answer(s): C Question 2:

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 3:

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 - Speed-increasing gears C - Speed-reducing gears D - A higher torque camshaft Correct Answer(s): B Question 4:

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

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

Question 5:

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 6:

In an axial compressor, when the gas passes through the fixed blades, its pressure is further increased by conversion of:

A - Velocity B - Discharge rate C - Suction D - Volume Correct Answer(s): A Question 7:

The two types of thrust bearings used in axial compressors are designed to:

A - Reduce corrosion of the compressor blades B - Absorb the axial thrust that is directed toward the discharge end of the rotor C - Align the stator with the impellers D - Absorb the axial thrust that is directed toward the inlet end of the rotor Correct Answer(s): D Question 8:

A major advantage of a horizontally split compressor casing is that:

A - The casing is a one-piece design allowing for maximum velocity to pressure conversion B - The upper casing can be removed for maintenance functions C - A gasket is used to seal the upper and lower casings D - The casing seal is metal to metal Correct Answer(s): B Question 9:

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