What is the most common temperature sensing element used for mechanical thermostats?
A) Bi-metal coil B) Magnets C) Mercury bulb D) Warped discs
A
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PROBLEM 2.39 Two cylindrical rods, AC made of aluminum and CD made of steel, are joined at C and restrained by rigid supports at A and D. For the loading shown and knowing that Ea = 10.4 ? 106 psi and Es = 29 ? 106 psi, determine (a) the reactions at A and D, (b) the deflection of point C.
The __________ on a typical conduit hand bender head is where you will place the middle bending mark when doing a three-point saddle bend.
a. arrow b. rim notch c. star point d. hook
What type of loads vary from 20 to 40 psf (0.96 to 1.92 kN/m2) depending on the pitch and the use of the roof?
A. wind B. floor live C. roof live D. moving live
Technician A says that after repairing and refilling a coolant system, all air must be purged from the system. Technician B says that when refilling a cooling system, a mixture of 25 percent glycol and 75 percent water should be added. Who is correct?
A. Technician A only B. Technician B only C. Both Technicians A and B D. Neither Technician A nor B