A single-track incremental encoder is capable of indicating the direction of rotation.
Answer the following statement true (T) or false (F)
False
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Answer the following statement(s) true (T) or false (F)
1. Pilot control devices are often employed to control the operation of a wound rotor induction motor. 2. The overload relay for a wound rotor motor contains two sets of contacts, both normally closed. 3. Four separate levers permit selection of the motor’s operating speed. 4. If the motor is operating and a lower speed is selected, it immediately decreases to the lower speed without time delay.
4,615 + 823 =
A) 5,438 B) 5,448 C) 4,438 D) 5,338
Commercial and industrial refrigeration systems:
A) Are only used in production facilities. B) Use three-phase equipment only. C) Refer to retail food and cold-storage equipment and facilities. D) Are used only in supermarkets.
One operating advantage of fixed restriction metering devices over expansion valves is:
A) Easier to adjust. B) Improved system control. C) Higher operating efficiency. D) Can be used with low starting torque compressor motors.