The controllers connected in a network can share information because they use a common set of rules known
as a _____.
a. communications bus
b. bridge
c. single user interface
d. protocol
d
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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.
One ounce is equal to 28.35 grams. Convert 16 ounces to grams. Round your answer to the nearest tenth
A) 1.8 grams
B) 12.4 grams
C) 44.4 grams
D) 453.6 grams
A rear-wheel drive vehicle shudders or vibrates when first accelerating from a stop. The vibration is less noticeable at higher speeds. The most likely cause is ________
A) Brinelling of the U-joint
B) Drive shaft imbalance
C) Unequal U-joint working angles
D) Excessive U-joint working angles
The EPA requires the repair of refrigerant leaks:
A) For all types of leaks in all kinds of systems. B) Only in systems with a refrigerant charge greater than 50 lb. C) Only in systems containing CFC refrigerant. D) Only in systems containing HFC refrigerant.