Which element of a closed-loop system is performed by a servo valve?
A. sensor
B. actuator
C. controller
Answer: B
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Answer the following statement(s) true (T) or false (F)
1. Most motors are successfully started at 90 percent of line voltage. 2. The starting transformers are inductive loads. 3. In an autotransformer-type starter the timing for the time-delay relay that controls the transfer from the reduced voltage condition to full voltage is not adjustable. 4. De-energizing the transformers while in the running position is done to conserve electrical energy. 5. Magnetic overload relays are used on large reduced voltage starters.
____________________ are thin metal tools that are used in drafting to protect the neighboring line from erasure.
Fill in the blank(s) with the appropriate word(s).
The cable-supported roof for a summer theater, shown in Figure P6.15, is composed of 24 equally spaced cables that span from a tension ring at the center to a compression ring on the perimeter. The tension ring lies 12 ft below the compression ring. The roof weighs 25 lb/ft 2 based on the horizontal projection of the roof area. If the sag at midspan of each cable is 4 ft, determine the tensile force each cable applies to the compression ring. What is the required area of each cable if the allowable stress is 110 kips/in. 2 ? Determine the weight of the tension ring required to balance the vertical components of the cable forces.
Two comparators arranged such that voltage levels between two prescribed limits are detected are known as what type of a circuit?
A) window comparator B) detector window C) threshold comparator D) threshold detector