Which of the following is an actuator that has a stationary permanent magnet and a coil that moves?
A. LVDT
B. ac induction motor
C. solenoid
D. voice coil
E. encoder
Answer: D
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In the simplest relationship between weight flow rate and fluid velocity, what happens to the velocity of fluid if the diameter of the pipe decreases?
A) Velocity will increase B) Velocity will decrease C) Velocity will not change D) Velocity cannot be measured
Which of the following is true of welding codes and specifications?
A. The selection of the specific code to use is made by the welder. B. They are guidelines and must be qualified for specific applications by testing. C. The code and specification ensure the product need not be inspected or tested. D. A welding code and a welding specification are the same thing.
A masonry veneer wall must be separated from its backup by an airspace of at least _____
a. 1/2 inch b. 1 inch c. 1-1/2 inches d. 2 inches
Answer the following statement(s) true (T) or false (F)
1. The simplest of electrical circuits is the parallel circuit. 2. Some strings of Christmas tree lights are wired in series. 3. Parallel circuits have more than one path for current flow. 4. Most circuits are connected in parallel. 5. In a parallel circuit, the current is the same at any point in the circuit.