The small gaps between the screws on the screw compressor are sealed by:
A) Tip seals.
B) Rings on the end of the rotors.
C) The malleable nature of metal the screws are made of.
D) Oil flooding.
D
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Which type of system is required to be grounded?
a. Systems less than 50V supplied by grounded transformers b. Circuits for cranes that operate over combustible fibers in Class III locations c. AC systems over 1kV that supply mobile or portable equipment d. Circuits for electrolytic cells
The nucleus of a cell is composed primarily of all the following except:
a. Proteins c. Nucleic acids b. Lipases d. Enzymes
The refrigerant line whose sizing has the most effect on the compressor's compression ratio is the:
A) Suction line. B) Liquid line. C) Discharge line. D) Refrigerant line sizing has no effect on compression ratio.
The torque of a squirrel-cage induction motor will be maximum when the phase angle between the stator and rotor fields is _____.
A. 0° B. 90° C. 180° D. 270°