Technician A says that in an open center circuit the hydraulic pump is rested (unloaded)when flow is not required by the actuator. Technician B says that in a closed-center circuit, the hydraulic pump runs continuously. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
Answer: D
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Which of the following is the standard carrier system in North America?
A. MUX B. T carrier C. E carrier D. TDMA
Probability + Consequences + Exposure = _____.
a. hazard b. risk c. threat d. danger
Para una halada recta, la longitud mínima de una caja de derivaciones con dos tuberías eléctricas de 1" y una tubería eléctrica de 4" en una pared, y dos tuberías eléctricas de 1" y una tubería eléctrica de 4" entrando por la pared opuesta es _____. (Suponga que el tamaño del conductor es n.° 4 AWG o superior, a una tensión inferior a 600V).
a. 24" (60,96 cm) b. 26" (66,04 cm) c. 32" (81,28 cm) d. 34" (86,36 cm)
The subjects of Thermal Sciences includes:
A) Thermodynamics, Fluid Mechanics, Transfer Processes B) Thermodynamics, Heat Transfer, Transfer Processes C) Thermodynamics, Fluid Mechanics, Heat Transfer D) Thermodynamics, Fluid Mechanics, Thermal System Design