Explain what resistance factor is in structural design.
What will be an ideal response?
Resistance factor is the second safety factor used in the design of structures. We calculate the strength (also called load resistance) of a structure by analytical procedures and then reduce the calculated strength by multiplying it with a factor < 1.0. This takes into account the uncertainty in calculating the strength of the structure.
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The vertical distance between contour lines is known as ____.
A. distance interval B. contour interval C. strata interval D. contour index
Match the symptom with all possible causes. Note: The choices can be used more than once.
A. refrigerant overcharge B. non-condensable gas in system C. defective condenser fan motor D. dirty condenser coil E. refrigerant undercharge F. blocked/dirty filter G. defective evaporator fan motor H. I. improper system balancing J. K.
An environmental engineer wants to evaluate three different methods for disposing of a non-hazardous chemical waste: land application, fluidized-bed incineration, and private disposal contract. Use the estimates below to help him determine which has the least cost at i = 10% per year, on the basis of an (a) annual worth, and (b) present worth evaluation.
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The purpose of the start-capacitor in the capacitor-start motor is ____.
A. to allow the motor to operate as well on DC as it does on AC B. to save wear and tear on the brushes and commutator C. to smooth out the 120 Hz vibrations D. to produce a higher starting torque than that found in the split-phase motor