List the basic impeller designs used on centrifugal compressors.
What will be an ideal response?
Impeller designs- compressors have a variety of impeller designs including, open backward-bladed impeller, open radial-bladed impeller, and closed backward-bladed impeller or Straight Vane- Semi-open, or closed, Curved Vane- curved backward or curved forward.
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Spot detectors containing a light source and a photosensitive device on which light rays do not normally fall operate on the _____.
a. ionization principle b. light-scattering principle c. light-obscuration principle d. smoke-rate compensation principle
The furnace has one or more broken heating elements or one or more fusible links open. What should the technician do?
A) The technician should check the power source to the furnace. B) The technician should check the furnace airflow. C) The technician should replace all the fusible links. D) The technician should replace all the heating elements.
The last stage of a multiplier circuit is usually a(n)
A) summing amplifier B) log amplifier C) OTA amplifiers D) antilog amplifier
A gearmotor is:
A. A reducer and motor combined. B. A specially wound, variable speed motor. C. A motor with a T-face to allow easy coupling to gears. D. A motor with an internally geared rotor.