Answer the following statement(s) true (T) or false (F)
1. Most high-voltage power transmission and distribution is three-phase AC.
2. Transmission voltages are often in the range of 138kVAC to 500kVAC.
3. In a transformer, the primary coil is the output and the secondary coil is the input.
4. The unit of measure for frequency is hertz (Hz).
5. Power utilities use high-voltage single-phase generators and then use transformers to develop three-phase distribution.
1. TRUE
2. TRUE
3. FALSE
4. TRUE
5. FALSE
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Answer the following statement true (T) or false (F)
PROBLEM 3.157 Ends A and D of the two solid steel shafts AB and CD are fixed, while ends B and C are connected to gears as shown. Knowing that the allowable shearing stress is 50 MPa in each shaft, determine the largest torque T that may be applied to gear B.
Employee participation in small, incremental improvements is known as:
A) Kaizen. B) drum-buffer-rope. C) motion economy. D) value stream mapping.
Which of the following is TRUE of the fan switch?
A) The fan switch is not separate from the burner. B) The fan switch starts the blower when the burner starts. C) Modern fan switches cycle the fan based on time. D) The fan switch relies on a temperature cycle in modern furnaces.