What is the time constant in an RC integrating circuit if a 10 k? resistor is in series with a 220 ?F capacitor?
A) 0.22 ms B) 22 ms C) 2.2 s D) 2.2 ms
C
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A transmission is lubricated (A) by lubricating oil that is thrown around the case by gear rotation, or (B) to remove excess heat from the gears. Which is correct?Select one:
a. A only b. B only c. Both A and B d. Neither A nor B
When making connections to reverse the rotation of a motor, _____.
a. connect lines L1, L2, and L3 to the motor terminals T1, T2, and T3, respectively b. L1 is connected to motor terminal T3, and L3 is connected to motor terminal T1 c. L1 is connected to motor terminal T2, and L3 is connected to motor terminal T1 d. L1 is connected to motor terminal T3, and L2 is connected to motor terminal T1
A ____ permits voltage to be stepped up or down.
a. resistor b. transformer c. capacitor d. battery
The expansion device in a mechanical refrigeration system _____
a. raises the temperature of the refrigerant b. acts as a heat exchanger c. provides a pressure drop d. raises the pressure of the refrigerant