How is the starting current and speed of a wound rotor induction motor controlled?
What will be an ideal response?
The starting current and speed of a wound rotor induction motor is controlled by adding or subtracting the amount of resistance connected in the rotor circuit.
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What percent of the root zone of most plants must receive water to provide the benefits of irrigation?
a. 30 c. 50 b. 40 d. 60
Refer to the network in Fig. 16.98. Find the following transfer functions:
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Why might there be a negative pressure on the condensate outlet in a coil operating at a positive static pressure?
A) The draining water creates an internal pressure in the drain line. B) The air velocity can create a negative pressure. C) The algae collecting in the drain pan creates a negative pressure. D) A positive static pressure is really negative compared to atmospheric pressure.
What is the purpose of the venturi on a one-pipe venturi system?
A) The venturi separates air bubbles from the circulating water. B) The venturi creates a negative pressure at the main connection, drawing the necessary flow through the branch. C) The venturi mixes the supply and return water for more even temperatures. D) The venturi increases the pressure in the pipe to offset piping losses.