Each molecule of water contains two atoms of hydrogen and one atom of oxygen.
Answer the following statement true (T) or false (F)
True
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A dc, separately excited motor has an armature resistance of 1 ? and field constant K? = 3 Vs. The motor is driven by a full-wave, ac/dc, SCR circuit. The triggering angle of the SCRs is 30o . The voltage on the ac side is 277 V (rms). The motor load is bidirectional and equals 120 Nm at steady state, regardless of the direction of rotation. A countercurrent braking is implemented by reversing the polarities of the motor terminals. The triggering angle of the SCRs is adjusted so that the maximum braking current is twice the steady-state value. Calculate the new steady-state speed.
What will be an ideal response?
Which of the following statements is true about these systems?
A) The R410a system can operate at half the suction line pressure as the R-22 system. B) The R-22 system can operate at twice the suction line pressure as the R-410a system. C) The R-410a system can operate at twice the suction line pressure as the R-22 system. D) The R-22 system can operate at the same suction line pressure as the R-410a system.
Which of these technologies is NOT used in 80 percent furnaces?
A) Adding induced draft combustion blowers B) Flattening and serpentining heat exchangers C) Adding a condensing recuperative coil D) Removing standing pilot lights
How many standard-size bricks are needed to build an 8 inch rowlock cap atop an 8" wall whose length is 8'?
What will be an ideal response?