Prescriptive-type tables for use in project specifications have been developed by the _____
a. American Cement Specification Board
b. American Concrete Institute
c. American Concrete Council
d. American Cement Manufacturers' Association
b
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Not many foods are ____ because our minds tell us that if we see foods in these unusual colors, they
may be spoiled or otherwise unhealthy to eat.
a. blue-green or black c. yellow or orange b. red or white d. dark-red or purple
Technician A says that clicker type torque wrenches should be calibrated regularly. Technician B says to store clicker torque wrenches at the zero setting. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
Which of the following statements about converting a system from one refrigerant to another is incorrect?
a. Synthetic and mineral oils are completely compatible. b. A new metering device may be required. c. Equipment capacity may change with the new refrigerant. d. Gaskets and O-rings may have to be changed.
The speed–torque characteristic of an induction motor has been empirically determined as follows:
The motor will drive a load requiring a starting torque of 4 N-m and increase linearly with speed to 8 N-m at 1,500 r/min.
a. Find the steady-state operating point of the motor.
b. Equation 19.68 predicts that the motor speed can be regulated in the face of changes in load torque by adjusting the stator voltage. Find the change in voltage required to maintain the speed at the operating point of part a if the load torque increases to 10 N-m.
