The difference in electrical charge between two points is referred to as ____.
a. current
b. voltage
c. amperes
d. volts
b. voltage
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What should process technicians do when maintaining and monitoring vessels?
A) Check auxiliary equipment B) Listen for abnormal noise C) Use sniffers to detect gas leaks and vapors D) All of the above
El diámetro externo de un tubo de hierro de 3 pulgadas (7,62 cm) mide _____.
a. más de 3 pulgadas (7,62 cm) b. menos de 3 pulgadas (7,62 cm) c. exactamente 3 pulgadas (7,62 cm) d. Ninguno de los anteriores.
Changes in weld type such as groove or fillet welds do not require a new certification.
Answer the following statement true (T) or false (F)
A 220 V, dc series motor has an armature current of 86 A, armature resistance of 0.2 ?, and a field resistance of 0.1 ?. The terminal voltage of the motor can be adjusted by means of solid-state devices. Ignore the field saturation.
a. When the motor runs at 600 rpm, the armature current is 20 A. A 0.1 ? resistance is added in shunt to the field windings. If the load torque remains constant, calculate the speed of the motor. b. The resistance in shunt of the field windings is removed. The motor is used to lower the same mechanical torque described in (a) by a countercurrent braking method. The desired speed in the countercurrent braking is 10 rpm. The braking current is twice the rated value. Calculate the armature voltage of the motor.