The electrical disconnect can be mounted to the rooftop unit, provided that:
A) It can easily be removed for service. B) It does not block access to any service panels.
C) It is mounted inside the unit. D) It is a general-duty box.
B
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Three-dimensional spatial skills are acquired during the ____________________ stage of development of spatial skills.
Fill in the blank(s) with the appropriate word(s).
What is the number of conductors and the wire size specified for the feeder circuit supplying rooftop unit No. 1 in the power-riser diagram in Figure 3?
a. Three No. 10 AWG
b. Four No. 2 AWG
c. Three No. 6 AWG
d. Four No. 4/0 AWG
A dc, separately excited motor is driven by a full-wave, SCR, ac/dc converter. The voltage on the ac side is 120 V (rms). The field constant of the motor K? = 3 Vs. At a load torque of 300 Nm and triggering angle of 40o , the motor speed is 100 rpm, and the armature current is continuous.
a. The polarities of the terminal voltage of the motor (armature voltage) are reversed, and the triggering angle is simultaneously changed. Assume that the load torque is also reversed and is equal to 300 Nm. Calculate the triggering angle that stops the motor and keeps it at the holding position. Assume that the current is still continuous. b. Sketch the speed-torque characteristics and indicate the steady state operating points before and after polarity reversal.
What are ghost voltages?
What will be an ideal response?