____-pole circuit breakers are used to connect three-phase circuits.
a. Single
b. Double
c. Three
d. Variable
c. Three
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Which of these devices is NOT used to control the airflow in an HVAC system?
A) Electric motor B) Vacuum motor C) Exciter module D) Cable
bipolar BLDC motor is used to drive a unidirectional torque of 300 Nm. The voltage of the dc source is 400 V, k? = 1.0 Vs, and the armature resistance of the motor is 1.0 ?. Compute the modulation factor for the following cases:
a. Motor operation at 600 rpm b. Holding c. Plugging at 300 rpm in the reverse direction Also, compute the armature current in all of the above cases.
If you wanted to monitor a large alternating current without opening the circuit you would likely use a ________
A) current-sensing inductor B) current transformer C) step-down transformer D) any of the above
Refer to Figure P2.49 and assume R0 = 2 ?, R1 = 1 ?, R2 = 4/3 ?, R3 = 6 ?, and VS = 12 V. Use KVL and Ohm’s law to find:
Known quantities:
Schematic of the circuit shown in Figure P2.55 with resistors R0 = 2 ?, R1 = 1 ?, R2 = 4/3 ?, R3 = 6 ?, and VS = 12 V. and voltage source Vs=12V.
a. The mesh currents ia , ib, and ic.
b. The current through each resistor.