?How is a metal's hardness reduced?
A. ?By annealing
B. ?By forging
C. ?Re-melting it
D. ?By using a grinder to remove the hard surface
Answer: A
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Write a computer program based on Eq. 9.15, and obtain the plot in Fig. 16.1. Now consider that a thin sheet specimen of an alloy of iron, containing 0.018 percent carbon, is heated to 800 K and held there long enough to come to equilibrium before being quenched in iced brine.
(a) Estimate from your figure the amount of carbon in solid solution just after the quench. (b) If the specimen is maintained in the iced brine for a very long time, would you expect the amount of carbon in solid solution to remain the same as that existing just after the quench?
Brake shoe holddowns are used to reduce brake noise
Indicate whether the statement is true or false
Technician A says an antilock brake system will always produce the shortest possible stops. Technician B says when braking on loose gravel or dirt, a system that can lock the wheels can produce shorter stops than an antilock system. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
Which of the following is the minimum-size bonding jumper to metal water piping systems in a multi-occupancy building in which the water piping of each unit is isolated from the others? The 400 A building service is supplied by 500 kcmil service- entrance conductors and each occupancy is supplied by a 100 ampere feeder.
A. 3/0 AWG copper B. 1/0 AWG copper C. 3 AWG copper D. 8 AWG copper