Briefly describe the method of stopping a motor known as plugging.
What will be an ideal response?
When any two of the line leads feeding a three-phase motor are reversed, a countertorque is set up that brings the motor to a quick standstill before it begins to rotate in the reverse direction. If the circuit is interrupted at the instant the motor begins to turn in the opposite direction, the rotor just stops. This method of bringing a motor to a quick stop is called plugging.
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good electrical connection should _____.
a. last for approximately 90 days without any maintenance or repairs b. be mechanically and electrically secure c. have a resistance of no more than 25 ohms d. have a resistance of no more than 13 ohms
Water pumps ________
A) Are driven by the engine crankshaft or camshaft B) Use engine oil as a lubricant and coolant C) Only work at idle and low speeds and are disengaged at higher speeds D) Disengage during freezing weather to prevent radiator failure
For signal sequence si = (5, -2, 3) and SNR = 20 dB, the noise SD ?N = _____x.xx).
Fill in the blank(s) with the appropriate word(s).
What is 175° 32’ divided by 4?
What will be an ideal response?