Gray iron is a good material for machine parts because of its ____________________ resistance.
Fill in the blank(s) with the appropriate word(s).
fatigue
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In your own words, summarize how personal privacy is defined in the Fourth Amendment of the U.S. Constitution.
What will be an ideal response?
The synchronous speed at which a four-pole, 60Hz induction motor operates is _____.
a. 1,140 rpm b. 1,800 rpm c. 2,500 rpm d. 6,900 rpm
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.
Inductance is often called:
A) Arc control B) Arc force C) Pinch D) All of the above