Which of the following restrictions are best used for measuring fluids that contain solid particles?
A. orifice
B. flow nozzle
C. venturi
Answer: C
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When a boot fails, its grease leaks out.
Answer the following statement true (T) or false (F)
Engineers must perform under a standard of professional behavior that requires adherence to the highest principles of ethical conduct.
a. True b. False
A dc, separately excited motor is used in a forklift. The motor is driven by a full- wave, ac/dc converter. The voltage on the ac side is 120 V (rms). The field constant of the motor K? = 3 Vs. The armature current is continuous under the loading conditions. At a load torque of 300 Nm and triggering angle of 40o , the motor speed is 100 rpm.
a. Calculate the triggering angle required to block (stop) the motor. b. Calculate the average voltage across the motor terminals if the triggering angle increases to 120°. c. Calculate the new speed of the motor at the condition described in part (b). d. Sketch the speed-torque characteristics and show all the operating conditions.
Consider the IA of Figure P15.11. Let R1 = 1 k?. What value of R2 should be used to make the gain of the input stage equal 50?
