A hybrid topology that combines two different network topology types is ________
A) tree network topology B) mesh network topology
C) merged network topology D) shared media topology
A
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Control systems that operate on ____ volts are often used in hazardous areas.
a. 24 b. 120 c. 230 d. 240
Why are pocket type dial thermometers intended to give only approximate readings, and not 100% accurate reading?
What will be an ideal response?
For a three-phase system using a 100 MVA power base and a 138 kV voltage base, what is the per unit impedance of Z = 5.06 + j23.7 ??
What will be an ideal response?
A 250 V, 500 rpm, dc, separately excited motor is driving a constant-load torque. The motor has a field constant K? = 4 Vs and an armature resistance of 1 ?. Ignore the frictional losses.
a. Calculate the full-load torque. b. Determine the terminal voltage required to block (stop) the motor. c. Determine the terminal voltage needed to rotate the motor at 100 rpm in the reverse direction. d. Calculate the motor speed while the motor is operating at the conditions of part (c), and the polarities of the terminal voltage are reversed. e. Sketch the speed-torque characteristics and show all the operating conditions.