Why must the expansion tank always be located higher than the boiler?
What will be an ideal response?
to permit air in the connecting line to rise to the tank without being trapped in the line
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PROBLEM 2.10
A 1.5-m-long aluminum rod must not stretch more than 1 mm and the normal stress must not exceed 40 MPa when the rod is subjected to a 3-kN axial load. Knowing that E = 70 GPa, determine the required diameter of the rod.
Read the vernier protractor scale in the accompanying figure.
A. 20o25' B. 20o30' C. 21o25' D. 21o30'
Understand the purpose of the following mechatronic system and recommend an appropriate sensor and actuator to carry out the specified task.
a. Temperature Control System Purpose: To maintain the temperature of a confined space at the specified temperature. (Hint: Decide how to sense the temperature. Decide how to increase or decrease temperature.) b. Anti-lock Braking System Purpose: To prevent wheel lock-up by automatically modulating the brake pressure during an emergency stop. (Hint: Decide how to sense that the wheels are locked (i.e.: the wheels are not rolling). Decide how to apply or release brakes.) What will be an ideal response?
When a liquid boils:
A) It is releasing heat while changing from liquid to gas. B) Its temperature is always 212°F. C) Spontaneous gassification creates new gas molecules. D) It is absorbing heat while changing from liquid to gas.