Given a set of steps with standard-size bricks used to cover the riser and tread surfaces of a flight of concrete stairs if each tread measures 12" deep by 48" wide and each riser is 8" high, how many bricks are needed to cover four risers rounded up to the nearest whole brick? (Refer to the diagram on page 63 in the book.)
What will be an ideal response?
72
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A dc, separately excited motor is driving an elevator. At a load torque of 300 Nm, the motor speed is 100 rpm. The motor terminal voltage is 210 V, and the field constant K? is 3 Vs.
a. If the terminal voltage is reversed and reduced to 90 V, calculate the steady- state speed of the motor. b. Calculate the terminal voltage required to block (stop) the rotor. c. Sketch the speed torque characteristics and show all operating conditions
Design teams often reverse engineer existing products to develop new understanding, which may be applied to new or similar products.
Answer the following statement true (T) or false (F)
Micropropagation can produce an entire plant from a single cell of the parent plant
Indicate whether the statement is true or false
When a compressor is changed, the 4-way valve also must be changed.
Answer the following statement true (T) or false (F)